Disappointing news – or not – about moderate drinking

heart

Many studies and reviews have supported the notion that moderate alcohol consumption is beneficial for heart health. Why not have a daily glass or two of wine at dinner, as it could ward off disease. And now they come and spoil the fun.

A joint group of Canadian, Australian and US scientists took a hard look at the evidence presented in previously published research and found little support for a heart protective effect of moderate alcohol consumption.

And here you are believing the previously good news, who can you really trust? But not all is lost so read on.

So what did they find?

The new assessment initially agreed with the previous findings as a fully adjusted pooled analysis of all the 45 studies reviewed found significantly reduced coronary heart disease mortality for current moderate drinkers, actually for all current drinkers.  So all good now, can I continue to have a glass or two of wine to dinner and feel healthier?

Unfortunately not, as the researchers found confounding factors in that they could see an influence of age, gender, ethnicity, and heart health at baseline. When correcting for such factors they claim that moderate consumption of alcohol was not significantly protective for people at ages 55 years or younger at baseline, or for studies controlled for heart health at the beginning of the study. They even claimed that the appearance of cardio-protection among older people may reflect systematic selection biases that accumulate over the life course.

Their hypothesis is that non-drinkers may, in fact, be former drinkers who quit or cut down for health reasons. So, of course the remaining healthy drinkers will fair better than their poor abstainers that are already sick. And the seniors who are healthy may be more likely to keep enjoying that glass of wine with dinner thus biasing the results.

However, the researchers stop short of turning the previous findings on its head. They only conclude that there remain grounds for skepticism about the hypothesis that alcohol use can be cardio-protective, and recommend that future prospective studies not only avoid biased abstainer reference groups, but also take steps to minimize other forms of selection bias across the life course, including that from competing disease risks.

So there is still hope?

red_wine_(boo_licious)Yes, there is still hope that a daily glass of wine might keep you healthy longer as the researchers can’t prove it one way or the other. Only that there are grounds for a healthy skepticism as there remain plausible alternative explanations for their observed review findings.

So let’s make it clear. For now, no one is saying that people who enjoy alcohol in moderation should stop. Should there be no direct benefits, at least the risks of low-level drinking would be small.

Let’s drink to that, but only in moderation!