Category Archives: homocysteine

Homocysteine, B Vitamins, Brain Atrophy and Mild Cognitive Impairment

A new PLoS article has been published, arguing that

The accelerated rate of brain atrophy in elderly with mild cognitive impairment can be slowed by treatment with homocysteine-lowering B vitamins

I don’t have time to deal with this in as much detail as I would like (lots of things getting in the way of blogging, which is why it has been quiet here lately) but I think this is worth some quick notes. This post is short and a bit messy: for a summary of what the article does and doesn’t know, see Behind the Headlines; for a summary of some concerns with it, see Evidence Matters. Keep reading if you’re interested in the Holford angle. Continue reading

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Filed under hometesting, homocysteine, yorktest

Patrick Holford Claims More People Die, Prematurely, From Cardiovascular Disease Than Actually Die, Prematurely, From All Causes

Patrick Holford on ITV Lunchtime 16 April 2008
Former Visiting Professor Patrick Holford is Head of Science and Education at Biocare. Despite the imprimatur of respectability about these confidence-inspiring titles, from time to time, there are disappointing errors in the content of Holford’s health advice and sales pitches for home tests and the evidence base for supplements. These errors are all the more dispiriting when one recalls that he was corrected about some of them more than two years ago. We don’t mean differences of opinion, we mean verifiable, checkable facts. When Holford persuades people to rely upon his opinion and lend credence to it because he undertakes to do the scientific research and interpret it for them then it seems inappropriate to claim that more people died, prematurely, from a specific cause than actually died, prematurely, from all causes. Continue reading

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Patrick Holford Promotes His Apocryphal Homocysteine Gospel in The News of the World

Patrick Holford on ITV Lunchtime 16 April 2008
Former Visiting Professor Patrick Holford is Head of Science and Education at Biocare who display the indulgence of peculiarly fond family members in declaring him to be an innovative thinker and expert despite the many faux pas and errors that have been highlighted in his work. Biocare must be delighted to have their most high profile media nutritionist’s work featured in News of the World (NotW): Look 10 Years Younger with the H-Factor. Continue reading

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Filed under cancer, H Factors, health, homocysteine, patrick holford, supplements

Homocysteine: Really Not a Crystal Ball

Former Visiting Professor Patrick Holford is still Head of Science and Education at Biocare so presumably they must believe that he enhances their reputation and scientific credibility with his advocacy of tests such as those for homocysteine (Hcy) levels and recommendations that people with high levels (as defined by him) should lower it by taking various supplements (see related reading). Continue reading

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Polypills or Vitamins for Homocysteine and Cardiovascular Risks: the Hype is Ahead of the Evidence

You may have experienced déjà vu over the last few days if you’ve been reading excited accounts about polypills for the over-55s (there was a lot of Oh Brave New World about the potential for polypills in 2003). The claims are that polypills will prevent 100,000 premature deaths a year and also prevent up to 80% of heart attacks and strokes. The polypills will contain a cholesterol-reducing statin; three types of medicine to lower blood pressure (thiazide, aspirin and beta-blockers); and folic acid to reduce levels of homocysteine (Hcy). Continue reading

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Patrick Holford, Alzheimer’s Disease, Homocysteine Tests and Supplements

Professors Patrick Holford and David Smith chose the Daily Record to announce their remarkable findings that Alzheimer’s Disease is preventable with just a “few simple diet and lifestyle changes”.

I may be new to Holford Watch but I am familiar with the Holford Test-Em Dose-Em style of Jeopardy. If the answer is, “Dose them with B vitamins” the question must have been, “What do you do after testing someone’s homocysteine levels?”.  And, what do you know, I think it has slipped its way into this article, masquerading as a “simple blood test”. Continue reading

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Filed under Alzheimer's, B12, Brain Bio Centre, Holford, home test, homocysteine, patrick holford, supplements, vitamin B12, vitamins

How Relevant Are Holford’s Claims About Homocysteine Levels? Part 2

Patrick Holford gives a remarkable overview of history to support his claims for the value of homocysteine testing in helping you “to eliminate your risk of ever having a heart attack”. He swoops from autopsies on egyptian mummies to unsubstantiated opinions on the prevalence of heart disease in late 19th century America via some mangled statistics on the risk of premature death from cardiovascular disease in the UK, before alighting on a study of restenosis to justify his claims.

One of the most common surgical procedures for those with coronary artery disease is angioplasty. It involves inserting catheter tubing containing a small balloon into arteries around the heart. The balloon is inflated to flatten deposits of atherosclerotic plaques blocking the artery, so blood can once again flow to the heart.

Like bypass surgery, angioplasty is often not a permanent cure, and after surgery the arteries may reclog in the treated area – a very undesirable condition called restenosis…

Restenosis of the coronaries is much more likely if your H score is high, according to research at the Swiss Cardiovascular Centre in Bern. (4) In a nutshell, this means the higher your H score, the faster your coronary arteries will narrow again after surgery, so there’s little point having an angioplasty without testing for and treating high homocysteine.

Unfortunately, this is only part of the story; the role of homocysteine levels in predicting restenosis is not that straightforward. Holford has frequently expressed his concern about the mis-citing of research literature and possible suppression of inconvenient findings, so it seems appropriate to look at the research literature for homocysteine and restenosis in a little more detail to see if he is representing the literature in an evenhanded way.

Back in 2000, Dr. Steven Miner and his colleagues published an interesting study into possible correlations between homocysteine concentrations and restenosis following angioplasty. This was a well-designed, prospective study. The authors were confident in their conclusion that raised homocysteine levels do not predict the likelihood of restenosis.

The range of plasma homocysteine concentrations in this study is consistent with that seen in other studies,[refs] as is the trend toward an increased mean homocysteine concentration in homozygotes for the MTHFR 677T genotype.[ref] However, ours is the first published study to investigate the possible correlation between homocysteine concentrations and restenosis after PTCA and clearly shows the absence of any positive correlation. This lack of effect is apparent in patients undergoing PTCA alone and in with those receiving adjuvant stenting. No threshold effect is apparent. The adequate sample size, near complete follow-up, and the trend toward a negative correlation makes the possibility of a false-negative study extremely unlikely. [Emphasis added.]

There are several other studies that do not find a signficant relationship for homocysteine and restenosis:

2002 Relation of homocysteine, vitamin B(12), and folate to coronary in-stent restenosis “These results suggest that homocysteine, folate, and vitamin B(12) are not related to the angiographically determined rate of coronary in-stent restenosis after 6 months.”

2005 Clinician Update Homocysteine and Its Effects on In-Stent Restenosis cites a number of earlier clinical trials that fail to show a relationship between high homocysteine levels and restenosis. They note that several trials are in progress and conclude: “Until complete results of these studies become available, screening for hyperhomocystinemia in patients undergoing coronary stenting is only recommended in the case of premature atherosclerotic disease (patients homocysteine-lowering therapy might have a deleterious effect in patients treated with stent implantation“. [Emphasis added.]

2006 A prospective patient observational study of the role of hyperhomocysteinemia in restenosis in patients undergoing infrainguinal angioplasty or bypass procedures. “This study does not support the hypothesis that HHCy is associated with an increased risk of restenosis after vascular intervention.”

2006 Effect of folic acid supplementation on risk of cardiovascular diseases: a meta-analysis of randomized controlled trials. This is one of the studies that Holford acknowledges and disputes; however, the authors conclude: “Folic acid supplementation has not been shown to reduce risk of cardiovascular diseases or all-cause mortality among participants with prior history of vascular disease. Several ongoing trials with large sample sizes might provide a definitive answer to this important clinical and public health question”.

2006 Efficacy of folic acid therapy for prevention of in-stent restenosis: a randomized clinical trial. “Treatment with folic acid does not decrease the rate of restenosis and need for revascularization of the target lesion after stent-percutaneous coronary angioplasty.”

2006 Post-interventional homocysteine levels: failure as a predictive biomarker of in-stent restenosis. “[W]e hypothesise that homocysteine may not serve as a safe and independent biomarker of in-stent restenosis after a six months period following percutaneous coronary stenting.”

Holford uses a restenosis study that is not validated by other researchers to assemble a supporting platform of evidence to demonstrate the value of widespread testing of homocysteine levels.

Holford and Braly claim that homocysteine levels are a “chemical crystal ball”. It would be profoundly useful and cost-effective if homocysteine levels were capable of predicting the need for restenosis or could function as a simple index of your current and future health. Unfortunately, it doesn’t seem as if a homocysteine test can bear the mantle of so much responsibility: there isn’t even a consensus of opinion as to whether or not it has a predictive role for restenosis although the evidence is increasingly against it.

Regular homocysteine tests (as recommended 2-3 times a year to establish your baseline levels and tweak/maintain them with vitamin supplements) cost money; from around £70-75 per test. The recommended H Factors vitamin supplement will cost from £41.60 for 90 days to £41.60 for 30 days, depending on the recommended dose. There is no information about the bioavailability of the contents, so I don’t know if it is appropriate to expect your GP or Practice Nurse to advise you on your H Factors dosage; you might need to pay to consult a nutritionist or similar. A nutritionist might base his/her recommendations on an inappropriate interpretation of research and some unsupported beliefs.

You may well be comforted at the thought that your homocysteine levels are low or within bounds; however, it might be helpful if you are confident that there is good quality research to support the value of this. In subsequent parts of the review of Holford’s claims for homocysteine, we will look at trials that report that homocysteine levels can be reduced by vitamin supplementation but that this has no affect on clinical outcomes; e.g., you might spend between £700-1000 per year and successfully lower your homocysteine levels but still have raised blood pressure.

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Filed under folate, folic acid, H Factors, home test, homocysteine, james braly, patrick holford, Refsum, restenosis, vitamin B12, vitamins