Cancer patients are bombarded with information about supplements which allegedly are effective for their condition. I estimate that 99.99% of this information is unreliable and much of it is outright dangerous. So, there is an urgent need for trustworthy, objective information. But which source can we trust?
The authors of a recent article in ‘INTEGRATIVE CANCER THARAPIES’ (the first journal to spearhead and focus on a new and growing movement in cancer treatment. The journal emphasizes scientific understanding of alternative medicine and traditional medicine therapies, and their responsible integration with conventional health care. Integrative care includes therapeutic interventions in diet, lifestyle, exercise, stress care, and nutritional supplements, as well as experimental vaccines, chrono-chemotherapy, and other advanced treatments) review the issue of dietary supplements in the treatment of cancer patients. They claim that the optimal approach is to discuss both the facts and the uncertainty with the patient, in order to reach a mutually informed decision. This sounds promising, and we might thus trust them to deliver something reliable.
In order to enable doctors and other health care professionals to have such discussion, the authors then report on the work of the ‘Clinical Practice Committee’ of ‘The Society of Integrative Oncology’. This panel undertook the challenge of providing basic information to physicians who wish to discuss these issues with their patients. A list of supplements that have the best suggestions of benefit was constructed by “leading researchers and clinicians“ who have experience in using these supplements:
- vitamin D,
- maitake mushrooms,
- fish oil,
- green tea,
- milk thistle,
The authors claim that their review includes basic information on each supplement, such as evidence on effectiveness and clinical trials, adverse effects, and interactions with medications. The information was constructed to provide an up-to-date base of knowledge, so that physicians and other health care providers would be aware of the supplements and be able to discuss realistic expectations and potential benefits and risks (my emphasis).
At first glance, this task looks ambitious but laudable; however, after studying the paper in some detail, I must admit that I have considerable problems taking it seriously – and here is why.
The first question I ask myself when reading the abstract is: Who are these “leading researchers and clinicians”? Surely such a consensus exercise crucially depends on who is being consulted. The article itself does not reveal who these experts are, merely that they are all members of the ‘Society of Integrative Oncology’. A little research reveals this organisation to be devoted to integrating all sorts of alternative therapies into cancer care. If we assume that the experts are identical with the authors of the review; one should point out that most of them are proponents of alternative medicine. This lack of critical input seems more than a little disconcerting.
My next questions are: How did they identify the 10 supplements and how did they evaluate the evidence for or against them? The article informs us that a 5-step procedure was employed:
1. Each clinician in this project was requested to construct a list of supplements that they tend to use frequently in their practice.
2. An initial list of close to 25 supplements was constructed. This list included supplements that have suggestions of some possible benefit and likely to carry minimal risk in cancer care.
3. From that long list, the group agreed on the 10 leading supplements that have the best suggestions of benefit.
4. Each participant selected 1 to 2 supplements that they have interest and experience in their use and wrote a manuscript related to the selected supplement in a uniformed and agreed format. The agreed format was constructed to provide a base of knowledge, so physicians and other health care providers would be able to discuss realistic expectations and potential benefits and risks with patients and families that seek that kind of information.
5. The revised document was circulated among participants for revisions and comments.
This method might look fine to proponents of alternative medicine, but from a scientific point of view, it is seriously wanting. Essentially, they asked those experts who are in favour of a given supplement to write a report to justify his/her preference. This method is not just open bias, it formally invites bias.
Predictably then, the reviews of the 10 chosen supplements are woefully inadequate. These is no evidence of a systematic approach; the cited evidence is demonstrably cherry-picked; there is a complete lack of critical analysis; for several supplements, clinical data are virtually absent without the authors finding this embarrassing void a reason for concern; dosage recommendations are often vague and naïve, to say the least (for instance, for milk thistle: 200 to 400 mg per day – without indication of what the named weight range refers to, the fresh plant, dried powder, extract…?); safety data are incomplete and nobody seems to mind that supplements are not subject to systematic post-marketing surveillance; the text is full of naïve thinking and contradictions (e.g.”There are no reported side effects of the mushroom extracts or the Maitake D-fraction. As Maitake may lower blood sugar, it should be used with caution in patients with diabetes“); evidence suggesting that a given supplement might reduce the risk of cancer is presented as though this means it is an effective treatment for an existing cancer; cancer is usually treated as though it is one disease entity without any differentiation of different cancer types.
The authors declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article. But I do wonder, isn’t being in favour of integrating half-baked nonsense into cancer care and being selected for one’s favourable attitude towards certain supplements already a conflict of interest?
In any case, the review is in my view not of sufficient rigor to form the basis for well-informed discussions with patients. The authors of the review cite a guideline by the ‘Society of Integrative Oncology’ for the use of supplements in cancer care which states: For cancer patients who wish to use nutritional supplements, including botanicals for purported antitumor effects, it is recommended that they consult a trained professional. During the consultation, the professional should provide support, discuss realistic expectations, and explore potential benefits and risks. It is recommended that use of those agents occur only in the context of clinical trials, recognized nutritional guidelines, clinical evaluation of the risk/benefit ratio based on available evidence, and close monitoring of adverse effects. It seems to me that, with this review, the authors have not adhered to their own guideline.
Criticising the work of others is perhaps not very difficult, however, doing a better job usually is. So, can I offer anything that is better than the above criticised review? The answer is YES. Our initiative ‘CAM cancer’ provides up-to-date, concise and evidence-based systematic reviews of many supplements and other alternative treatments that cancer patients are likely to hear about. Their conclusions are not nearly as uncritically positive as those of the article in ‘INTEGRATIVE CANCER THERAPIES’.
I happen to believe that it is important for cancer patients to have access to reliable information and that it is unethical to mislead them with biased accounts about the value of any treatment.
I am sure, we have all heard it hundreds of times: THERE ARE IMPORTANT LINKS BETWEEN OUR DIET AND CERTAIN CANCERS. The evidence for this statement seems fairly compelling. Yet it also is complex and often confusing.
A recent review, for instance, suggested that fruits (particularly citrus) and vegetable consumption may be beneficial in the primary prevention of pancreatic cancer, the consumption of whole grains has been shown to reduce the risk and fortification of whole grains with folate may confer further protection. Red meat, cooked at high temperatures, should be avoided, and replaced with poultry or fish. Total fat should be reduced. The use of curcumin and other flavonoids should be encouraged in the diet. Another equally recent review, however, indicated that there is no conclusive evidence as an independent risk factor for isolated nutrients versus adoption of dietary patterns for cancer risk. Cancer colon risk derived from meat intake is influenced by both total intake and its frequency. The interaction of phenolic compounds on metabolic and signalling pathways seems to exert an inhibitory effect on cell proliferation and tumor metastasis and induces apoptosis in various types of cancer cells, including colon, lung, prostate, hepatocellular or breast cancer. A third recent review concluded that cruciferous vegetable intake protects against cancer of the colon, while a forth review suggested that the Mediterranean dietary pattern and diets composed largely of vegetables, fruit, fish, and soy are associated with a decreased risk of breast cancer. There was no evidence of an association between traditional dietary patterns and risk of breast cancer.
Not least based on these mixed messages from the scientific literature, an entire industry has developed selling uncounted alternative cancer-diets and dietary supplements to desperate patients and consumers. They promise much more than just cancer prevention, in fact, leave little doubt about the notion that cancer might be curable by diet. Here are just a few quotes from the thousands of websites promoting alternative cancer diets:
- The Ketogenic Diet is believed capable of starving cancer cells to death, and thus capable of restricting tumour development.
- a more alkaline body makes it difficult for tumors to grow.
- Budwig diet: This diet was developed by Dr. Johanna Budwig who was nominated for the noble Prize sixth times. The diet is intended as a preventative as well as an alternative cancer treatment.
- the Gerson Therapy naturally reactivates your body’s magnificent ability to heal itself – with no damaging side effects. This a powerful, natural treatment boosts the body’s own immune system to heal cancer, arthritis, heart disease, allergies, and many other degenerative diseases. Dr. Max Gerson developed the Gerson Therapy in the 1930s, initially as a treatment for his own debilitating migraines, and eventually as a treatment for degenerative diseases such as skin tuberculosis, diabetes and, most famously, cancer.
- the concept of macrobiotics is much more than an alternative diet for cancer, or any other illness, but rather the ancient Chinese belief that all life, indeed the whole universe, is a balance of two opposing forces Yin and Yang.
Confused? Yes, I do worry how many cancer patients listen to these claims and pin their hopes on one of these diets. But what exactly does the evidence tell us about them?
A German team of researchers evaluated the following alternative cancer-diets: raw vegetables and fruits, alkaline diet, macrobiotics, Gerson’s regime, Budwig’s and low carbohydrate or ketogenic diet. Their extensive searches of the published literature failed to find clinical evidence supporting any of the diets. Furthermore, case reports and pre-clinical data pointed to the potential harm of some of these diets. The authors concluded that considering the lack of evidence of benefits from cancer diets and potential harm by malnutrition, oncologists should engage more in counselling cancer patients on such diets.
In other words, alternative cancer diets – and I mean not just the ones mentioned above, but all of them – are not supported by good evidence for efficacy as a treatment or prevention of any type of cancer. In addition, they might also cause harm.
What follows is obvious: cancer patients should take sound nutritional advice and adopt a healthy general life-style. But they should run a mile as soon as anyone suggests an alternative dietary cure for their disease.
I am constantly on the look-out for good studies of alternative medicine, particularly those that yield positive findings. The trouble is that there aren’t many of those; studies tend to be either good or positive. Could this one be an exception?
The aim of this brand-new trial was to determine, if dietary supplements of glucosamine and/or chondroitin, result in reduced joint space narrowing (JSN) and pain in patients with knee osteoarthritis. It was designed as a double-blind randomised placebo-controlled clinical trial with 2-year follow-up. 605 participants, aged 45–75 years, reporting chronic knee pain and with evidence of medial tibio-femoral compartment narrowing (but retaining >2 mm medial joint space width) were randomised to once daily: glucosamine sulfate 1500 mg (n=152), chondroitin sulfate 800 mg (n=151), both of these dietary supplements (n=151) or placebo capsules (n=151). JSN (mm) over 2 years was measured from digitised knee radiographs. Maximum knee pain (0–10) was self-reported in a participant diary for 7 days every 2 months over 1 year.
The results indicate that, after adjusting for factors associated with structural disease progression (gender, body mass index (BMI), baseline structural disease severity and Heberden’s nodes), allocation to the dietary supplement combination (glucosamine–chondroitin) resulted in a statistically significant (p=0.046) reduction of 2-year JSN compared to placebo: mean difference 0.10 mm (95% CI 0.002 mm 0.20 mm); no significant structural effect for the single treatment allocations was detected. All 4 groups demonstrated reduced knee pain over the first year, but no significant between-group differences (p=0.93) were detected. 34 (6%) participants reported possibly-related adverse medical events over the 2-year follow-up period.
The authors drew the following conclusions: allocation to the glucosamine–chondroitin combination resulted in a statistically significant reduction in JSN at 2 years. While all allocation groups demonstrated reduced knee pain over the study period, none of the treatment allocation groups demonstrated significant symptomatic benefit above placebo.
This study has many strengths: it addresses a relevant research question, has a sufficiently large sample size, includes a long follow-up, and is well reported. So, it is a good study of an alternative therapy that is used by many patients. But did it really produce a positive result, i.e. findings which suggest that the tested treatments are effective? The answer seems ‘yes and no’. The combined, regular intake of both supplements caused less joint space narrowing which is a good objective sign of reduced disease activity. However, this was not paralleled by a reduction in pain that was better than that on placebo.
So, if you are a fan of glucosamine/chondroitin supplements, you will be pleased with this study, but if you are not in favour of such medications or do not have the spare cash to afford the considerable costs, you might say: I told you, they are pretty useless!
Many dietary supplements are heavily promoted for the prevention of chronic diseases, including cardiovascular disease (CVD) and cancer. But do they actually work or are they just raising false hopes? The evidence on this subject is confusing and proponents of both camps produce data which seemingly support their claims. In this situation, we need an independent analysis of the totality of the evidence to guide us. And one such review has just become available
The purpose of this article was to systematically review evidence for the use of multivitamins or single nutrients and functionally related nutrient pairs for the primary prevention of CVD and cancer in the general population.
The authors searched 5 databases to identify literature that was published between 2005 and January 29, 2013. They also examined the references from the previous reviews and other relevant articles to identify additional studies. In addition, they searched Web sites of government agencies and other organizations for grey literature. Two investigators independently reviewed identified abstracts and full-text articles against a set of a priori inclusion and quality criteria. One investigator abstracted data into an evidence table and a second investigator checked these data. The researchers then qualitatively and quantitatively synthesized the results for 4 key questions and grouped the included studies by study supplement. Finally, they conducted meta-analyses using Mantel-Haenzel fixed effects models for overall cancer incidence, CVD incidence, and all-cause mortality.
103 articles representing 26 unique studies met the inclusion criteria. Very few studies examined the use of multivitamin supplements. Two trials showed a protective effect against cancer in men; only one of these trials included women and found no effect. No effects of treatment were seen on CVD or all-cause mortality.
Beta-carotene showed a negative effect on lung cancer incidence and mortality among individuals at high risk for lung cancer at baseline (i.e., smokers and asbestos-exposed workers); this effect was persistent even when combined with vitamin A or E. Trials of vitamin E supplementation showed mixed results and altogether had no overall effect on cancer, CVD, or all-cause mortality. Only one of two studies included selenium trials showed a beneficial effect for colorectal and prostate cancer; however, this trial had a small sample size. The few studies addressing folic acid, vitamin C, and vitamin A showed no effect on CVD, cancer, and mortality. Vitamin D and/or calcium supplementation also showed no overall effect on CVD, cancer, and mortality. Harms were infrequently reported and aside from limited paradoxical effects for some supplements, were not considered serious.
The authors’ conclusion are less than encouraging: there are a limited number of trials examining the effects of dietary supplements on the primary prevention of CVD and cancer; the majority showed no effect in healthy populations. Clinical heterogeneity of included studies limits generalizability of results to the general primary care population. Results from trials in at-risk populations discourage additional studies for particular supplements (e.g., beta-carotene); however, future research in general primary care populations and on other supplements is required to address research gaps.
A brand-new RCT provides further information, specifically on the question whether oral multivitamins are effective for the secondary prevention of cardiovascular events. In total, 1708 patients aged 50 years or older who had myocardial infarction (MI) at least 6 weeks earlier with elevated serum creatinine levels were randomly assigned to an oral, 28-component, high-dose multivitamin and multi-mineral mixture or placebo. The primary end point was time to death, recurrent MI, stroke, coronary revascularization, or hospitalization for angina. Median follow-up was 55 months. Patients received treatments for a median of 31 months in the vitamin group and 35 months in the placebo group. 76% and 76% patients in the vitamin and placebo groups completed at least 1 year of oral therapy, and 47% and 50% patients completed at least 3 years. Totals of 46% and 46% patients in both groups discontinued the vitamin regimen, and 17% of patients withdrew from the study.
The primary end point occurred in 27% patients in the vitamin group and 30% in the placebo group. No evidence suggested harm from vitamin therapy in any category of adverse events. The authors of this RCT concluded that high-dose oral multivitamins and multiminerals did not statistically significantly reduce cardiovascular events in patients after MI who received standard medications. However, this conclusion is tempered by the nonadherence rate.
These findings are sobering and in stark contrast to what the multi-billion dollar supplement industry promotes. The misinformation in this area is monumental. Here is what one site advertises for heart disease:
Vitamin C could be helpful, limit dosage to 100 to 500 mg a day.
Vitamin E works better with CoQ10 to reduce inflammation in heart disease. Limit vitamin E to maximum 30 to 200 units a few times a week. Use a natural vitamin E complex rather than synthetic products.
CoQ10 may be helpful in heart disease, especially in combination with vitamin E. I would recommend limiting the dosage of Coenzyme Q10 to 30 mg daily or 50 mg three or four times a week.
Curcumin protects rat heart tissue against damage from low oxygen supply, and the protective effect could be attributed to its antioxidant properties. Curcumin is derived from turmeric, which is often used in curries.
Garlic could be an effective treatment for lowering cholesterol and triglyceride levels for patients with a history or risk of cardiovascular disease, especially as a long term strategy.
Terminalia arjuna, an Indian medicinal plant, has been reported to have beneficial effects in patients with ischemic heart disease in a number of small studies. Arjuna has been tested in angina and could help reduce chest pain.
Magnesium is a mineral that could help some individuals. It is reasonable to encourage diets high in magnesium as a potential means to lower the risk of coronary heart disease.
Danshen used in China for heart conditions.
And in the area of cancer, the choice is even more wide and audacious as this web-site for example demonstrates.
So, the picture that emerges from all this seems fairly clear. Despite thousands of claims to the contrary, dietary supplements are useless in preventing cardiovascular diseases or cancer. All they do produce, I am afraid, is rather expensive urine.
Web-sites have become a leading source of information on health matters. This is particularly true in the realm of alternative medicine. Conventional health care professionals often know too little about this subject to advise their patients, and alternative practitioners are usually too biased to be trusted. So many consumers turn to the Internet and hope that it offers information which is reliable. But is it?
American pharmacists published a study evaluating the quality of on-line information on herbal supplements. They conducted a search of 13 common herbals – including black cohosh, echinacea, garlic, ginkgo, ginseng, green tea, kava, saw palmetto, and St John’s wort - and reviewed the top 50 Web sites for each using a Google search. Subsequently, they analysed clinical claims, warnings, and other safety information.
A total of 1179 Web sites were examined in this way. Less than 8% of retail sites provided information regarding potential adverse effects, drug interactions, and other safety information; only 10.5% recommended consultation with a healthcare professional. Less than 3% cited scientific literature to support their claims.
The authors’ conclusions were worrying: Key safety information is still lacking from many online sources of herbal information. Certain nonretail site types may be more reliable, but physicians and other healthcare professionals should be aware of the variable quality of these sites to help patients make more informed decisions.
Having conducted my fair share of similar research (e.g. here or here or here or here), I can only concur with these conclusions. When it comes to health care, the Internet is a scary place! In the realm of alternative medicine, it is dominated by people who seem not to care much about anything other than their profits.
But what can be done to change this situation? How can we protect the public from Internet-charlatans? How can one control the Internet? I wish I knew! But there are nevertheless means of directing consumers to those sites which do offer reliable information. Kite-marking high quality sites might be one way of achieving this. This task would, of course, be huge and difficult, but in the interest of public safety, governments and other official institutions should consider tackling it.
Hypercholesterolemia is an important, independent risk factor for cardiovascular disease, according to a generally accepted wisdom. Measures to normalise elevated blood lipids include diet, exercise and drugs, of which statins are the most widely prescribed. But many people have become somewhat sceptical about the wide-spread use of statins: Traditionally, doctors have viewed statin drugs as the most effective way to lower high LDL cholesterol. But today researchers are starting to believe that statins may not be the magic bullet they’ve always been made out to be. Statins can cause severe adverse effects and some experts have questioned whether they generate more benefit than harm and suggested that ‘BIG PHARMA’ are pushing statins not for the benefit of public health but for maximising profit.
This begs the question: is there an alternative?
This RCT tested the efficacy of a dietary supplement providing 1.8 g/day esterified plant sterols and stanols to improve the fasting lipid profile of men and women with primary hypercholesterolemia. Repeated measures analysis of covariance was used to compare outcomes for sterol/stanol and placebo treatment conditions using the baseline value as a covariate. Thirty subjects were randomized and all of them completed the trial.
Baseline (mean±standard error of the mean) plasma lipid concentrations were: total cholesterol 236.6±4.2 mg/dL (6.11±0.11 mmol/L), high-density lipoprotein (HDL) cholesterol 56.8±3.0 mg/dL (1.47±0.08 mmol/L), LDL cholesterol 151.6±3.3 mg/dL (3.92±0.09 mmol/L), non-HDL cholesterol 179.7±4.6 mg/dL (4.64±0.12 mmol/L), and triglycerides 144.5±14.3 mg/dL (1.63±0.16 mmol/L). Mean placebo-adjusted reductions in plasma lipid levels were significant (P<0.01) for LDL cholesterol (-4.3%), non-HDL cholesterol (-4.1%), and total cholesterol (-3.5%), but not for triglycerides or HDL cholesterol.
The authors conclude that these results support the efficacy of 1.8 g/day esterified plant sterols/stanols in softgel capsules, administered as an adjunct to the National Cholesterol Education Program Therapeutic Lifestyle Changes diet, to augment reductions in atherogenic lipid levels in individuals with hypercholesterolemia.
These findings are encouraging but certainly not rock solid. The study was too small, and the effect sizes were less than impressive. A brand-new systematic review, however, provides much more convincing data.
Its aim was to quantify the LDL-cholesterol-lowering effect of plant sterols/stanols as supplements. Eight eligible clinical trials were identified. Among the trials with a duration between 4 and 6 weeks, plant sterol/stanol dose ranged from 1.0 to 3.0 g/day administrated mainly with the main meals (2 or 3 times/day). Intake of plant sterol/stanol supplements decreased LDL-cholesterol concentrations by 12 mg/dL (0.31 mmol/L) compared with placebo. Further analysis showed no significant difference between the LDL-cholesterol-lowering action of plant sterols/stanols supplements vs foods enriched with plant sterols/stanols. The authors concluded that plant sterol/stanol supplements as part of a healthy diet represent an effective means of delivering LDL-cholesterol-lowering similar to plant sterols/stanols delivered in various food formats.
Crucially, this positive verdict does not stand alone. Another recent review included 5 trials and concluded that a dose-effect relationship of plant stanols in higher doses than currently recommended has been demonstrated by recent clinical studies and a meta-analysis.
Plant sterols seem to be not just effective but also safe: none of the trials published to date reported significant adverse effects. The only concern is the potential decrease in the concentrations of lipid-soluble antioxidants and vitamins, including β-carotene, α-tocopherol, lutein, and α-carotene. It is currently not clear whether these effects are clinically relevant.
The relative merits of phytosterols versus statins are not easy to evaluate. We have hundreds of studies of statins but just a few of sterols. This means our knowledge in this area is incomplete. Statins can cause serious adverse effects but their effects on blood lipids is about one order of magnitude larger that those of sterols. There is plenty of evidence to show that statins lower the risk of cardiovascular disease, while such data are missing for phytosterols.
The choice between statins and plant sterols is thus not easy, particularly considering the often emotional arguments and hype used in the ‘cholesterol-debate’. Phytosterols offer one more alternative therapy for lowering LDL-cholesterol levels. They seem safe and have the added attraction of being ’natural’ – but the lipid-effects are relatively small, the impact on cardiovascular morbidity and mortality is uncertain, and fairly high doses are required to see any lipid-lowering at all.
For those who know about the subject, this is an old hat, of course. But for many readers of this blog, it might be news: ‘Traditional’ Chinese Medicine (TCM) is not nearly as traditional as it pretends to be. In fact, it is an artefact of recent creation. The man who has been saying that for years is Professor Paul Unschuld, one of the leading sinologist worldwide and an expert who has written many books and journal articles on the subject.
During an interview given in 2004, he defined TCM as “an artificial system of health care ideas and practices generated between 1950 and 1973 by committees in the People’s Republic of China, with the aim of restructuring the vast and heterogenous heritage of Chinese traditional medicine in such a way that it fitted the principles–Marxist Maoist type democracy and modern science and technology on which the future of the PRC was to be built…[the Daoist underpinning for TCM] is incorrect for two reasons. First . . . TCM is a product of Communist China. Second, even if we were to apply the term TCM to pre-revolutionary Chinese medicine, the Daoist impact should be considered minimal.”
In a much more recent interview entitled INVENTION FROM THE FAR EAST which he gave to DER SPIEGEL (in German), he explained this in a little more detail (I have tried to translate his words as literally as possible):
What is being offered in our country to patients as TCM is a construct that was created in China on an office desk which has been altered further on its way to the West.
Already at the beginning of the 20th century, reformers and revolutionaries urged that the traditional medicine in China should be abolished and that the western form of medicine should be introduced instead. Traditional thinking was seen as backwards and it was held responsible for the oppressing superiority of the West. The introduction of Western natural sciences, medicine and technology was also thought later, after the foundation of the People’s Republic, to be essential for rendering the country competitive again. Since the traditional Chinese medicine could not be totally abolished then because it offered a living to many citizens, it was reduced to a kernel, which could be brought just about in line with the scientific orientation of the future communist society. In the 1950s and 60s, an especially appointed commission had been working on this task. The filtrate which they created from the original medical tradition was hence forward to be called TCM vis a vis foreigners.
There is little more to add, I think - perhaps just two brief after-thoughts. TCM is a most lucrative export article for China. So don’t expect Chinese officials to rid TCM of the highly marketable ‘TRADITIONAL’ label. And remember: the ‘appeal to tradition’ argument is a fallacy anyway.
Pyruvate, a ketone and an alpha-keto acid, occurs naturally in the body when glucose is converted into energy. It is part of the Krebs cycle, the complex chain of reactions in which nutrients are metabolised to provide energy. High doses of pyruvate seem to stimulate the breakdown of fat in the body. It is therefore not surprising that pyruvate is used in all sorts of slimming aids; and if the advertising for ‘fat burners’ is to be believed, pyruvate is just the ticket for the desperate slimmer.
One such product advertisement, for instance, claims that sodium pyruvate and potassium pyruvate, which can act as a stimulant for the metabolism, adding to the thermogenesis process. Pyruvates have been found in studies to reduced the storage of fat in the body and convert the food source into calories which are then burned off in the production of heat. In one study, rats were injected with three fat burners, including pyruvates, and the rats given the pyruvates burned the greatest amount of fat by increasing the rat’s resting metabolic rate. With the elevated resting metabolic rate, the body burned more fat in individuals, which makes pyruvate an excellent source for weight maintenance.
So, maybe pyruvate works for rats – but does it really help those of us who would like to lose a few kilos? Some studies seem to say so, but others don’t. What do we conclude? There can only be one solution: we need a systematic review of the totality of the available trial evidence – and you probably guessed it: we have just published such an article.
The objective of our systematic review was to examine the efficacy of pyruvate in reducing body weight. Extensive literature searches identifies 9 RCTs of which 6 were met our inclusion criteria. All had methodological weaknesses. The meta-analysis revealed a statistically significant difference of 0.72 kg in body weight with pyruvate compared to placebo. The magnitude of the effect is small, and its clinical relevance is therefore uncertain. Adverse events included gas, bloating, diarrhoea, and increase in low-density lipoprotein cholesterol.
Our conclusion: The evidence from randomized clinical trials does not convincingly show that pyruvate is efficacious in reducing body weight. Limited evidence exists about the safety of pyruvate. Future trials involving the use of this supplement should be more rigorous and better reported.
Pyruvate supplements are popular; people who want to lose weight are misled into believing that they are effective. Bodybuilders as well as other athletes tend to take them because pyruvate is claimed to reduce body fat and enhance the ability to use energy more efficiently. None of these assumptions is based on sound evidence. Regardless of the evidence, a whole industry is exploiting the gullible and doing very well on it.
As these ‘fat burners’ are by no means cheap, I recommend a more efficient and more economical method for normalising body weight: eat a little less and move a bit more - I know it’s naff, but it works!
Herbal medicine is popular. Consumers seem to be attracted by the notion that they are natural – and if it’s natural, it must be safe!!! But do we really know what is in the product that we might be buying? A recently published analytical study aimed to investigate herbal product integrity and authenticity with the goal of protecting consumers from health risks associated with product substitution and contamination.
The researchers used DNA barcoding to conduct a blind test of the authenticity for (i) 44 herbal products representing 12 companies and 30 different species of herbs, and (ii) 50 leaf samples collected from 42 herbal species. They also assembled the first standard reference material (SRM) herbal barcode library from 100 herbal species of known provenance that were used to identify the unknown herbal products and leaf samples.
DNA barcodes from 91% of the herbal products and all leaf samples could be recovered. 59% of the products tested contained DNA barcodes from plant species not listed on the labels. 48% of the products could be authenticated but one-third of these also contained contaminants and or fillers not listed on the label. Product substitution occurred in 30 of the 44 products tested and only 2 of the 12 companies sold products without any substitution, contamination or fillers. Some of the contaminants we found pose serious health risks to consumers.
Based on these findings, the authors drew the following conclusions: Most of the herbal products tested were of poor quality, including considerable product substitution, contamination and use of fillers. These activities dilute the effectiveness of otherwise useful remedies, lowering the perceived value of all related products because of a lack of consumer confidence in them. We suggest that the herbal industry should embrace DNA barcoding for authenticating herbal products through testing of raw materials used in manufacturing products. The use of an SRM DNA herbal barcode library for testing bulk materials could provide a method for ‘best practices’ in the manufacturing of herbal products. This would provide consumers with safe, high quality herbal products.
These findings are fairly alarming. I have previously blogged about the fact that herbal products are far to often adulterated or contaminated. Now it seems that we have to add to this list of dangers the substitution of the herbal ingredient with a presumably less expensive but potentially toxic herb that should not legally be there at all.
The fish oil (FO) story began when a young Danish doctor noticed that there were no heart attacks in Greenland. Large epidemiological studies were initiated, mechanistic investigations followed, and a huge amount of fascinating data emerged. Today, we know more about FO than most other dietary supplements.
Fish oil contains large amounts of omega-3 fatty acids which are thought to be beneficial in treating hypertriglyceridemia, preventing heart disease. In addition, FO is often recommended for a wide variety of other conditions, such as cancer, depression, and macular degeneration. Perhaps the most compelling evidence exists in the realm of inflammatory diseases; the mechanism of action of FO is well-studied and includes powerful anti-inflammatory properties.
Australian rheumatologists just published a study of FO supplements for patients suffering from rheumatoid arthritis (RA). Specifically, they examined the effects of high versus low dose FO in early RA employing a ‘treat-to-target’ protocol of combination disease-modifying anti-rheumatic drugs (DMARDs).
Patients with chronic RA <12 months’ who were DMARD-naïve were enrolled and randomised 2:1 to FO at a high dose or plaacebo (low dose FO for masking). These groups were given 5.5 or 0.4 g/day, respectively, of eicosapentaenoic acid + docosahexaenoic acid. All patients received methotrexate (MTX), sulphasalazine and hydroxychloroquine, and DMARD doses were adjusted according to an algorithm taking disease activity and toxicity into account. DAS28-erythrocyte sedimentation rate, modified Health Assessment Questionnaire (mHAQ) and remission were assessed three monthly. The primary outcome measure was failure of triple DMARD therapy.
The results indicate that, the FO group, failure of triple DMARD therapy was lower (HR=0.28 (95% CI 0.12 to 0.63; p=0.002) unadjusted and 0.24 (95% CI 0.10 to 0.54; p=0.0006) following adjustment for smoking history, shared epitope and baseline anti–cyclic citrullinated peptide. The rate of first American College of Rheumatology (ACR) remission was significantly greater in the FO compared with the control group (HRs=2.17 (95% CI 1.07 to 4.42; p=0.03) unadjusted and 2.09 (95% CI 1.02 to 4.30; p=0.04) adjusted). There were no differences between groups in MTX dose, DAS28 or mHAQ scores, or adverse events.
The authors conclude that FO was associated with benefits additional to those achieved by combination ‘treat-to-target’ DMARDs with similar MTX use. These included reduced triple DMARD failure and a higher rate of ACR remission.
These findings are most encouraging, particularly as they collaborate those of systematic reviews which concluded that evidence is seen for a fairly consistent, but modest, benefit of marine n-3 PUFAs on joint swelling and pain, duration of morning stiffness, global assessments of pain and disease activity, and use of non-steroidal anti-inflammatory drugs and …there is evidence from 6 of 14 randomized controlled trials supporting a favourable effect of n-3 LCP supplementation in decreasing joint inflammation in RA. And you don’t need to buy the supplements either; regularly eating lots of fatty fish like mackerel, sardine or salmon has the same effects.
So, here we have an alternative, ‘natural’, dietary supplement or diet that is supported by reasonably sound evidence for efficacy, that has very few adverse effects (the main one being contamination of the supplement with toxins), that generates a host of potentially useful effects on other organ systems, that is affordable, that has a plausible mechanism of action…. Hold on, I hear some people interrupting me, FO is not an alternative medicine, it is mainstream! Exactly, an alternative medicine that works is called….MEDICINE.