In moderation!
Tucker, K.L., Jugdaohsingh, R., Powell, J.J., Qiao, N., Hannan, M.T., Sripanyakorn, S., Cupples, L.A., & Kiel, D.P. (2009). Effects of beer, wine and liquor intakes on bone mineral density in older men and women. American Journal of Clinical Nutrition, 89(4):999 – 1000.
This study looked at the alcohol intake, and bone density at the hip and spine, in 1182 men, 1289 post-menopausal women, and 248 pre-menopausal women. The participants were aged between 29 and 86. The difference between this study and other studies looking at bone density and alcohol, was that this study looked at different types of alcohol, and attempted to determine whether one type of alcohol was more beneficial than another for bone density.
The study results showed that men tended to be more likely to drink beer, whereas women tended to drink wine (But we knew that already, didn’t we!). Interestingly, bone mineral density at the hip was 3.4 – 4.5% greater in men who consumed 1-2 drinks of alcohol or beer compared to non-drinkers, however, men than drank more than two drinks per day had significantly lower hip and spine bone mineral density (3 – 5.2% lower than those that drank 1-2 drinks per day) – seemingly cancelling out the beneficial effect of the first drink!
Bone mineral density at the hip and spine was significantly greater in postmenopausal women consuming more than 2 drinks per day of total alcohol or wine (5.0 – 8.3% greater than in non-drinkers).
The researchers adjusted the data to see whether it may be the silicon content of the beer that was causing the improvement in bone density. The adjustment reduced the benefits of beer on bone density, suggesting that perhaps it is the silicon content of the beer that is causing the improvement in bone density in beer drinkers. However, this did not explain the improvements in bone density seen by the wine drinkers. The researchers suggested that there may be another compound (or other compounds) in other alcoholic drinks, yet to be defined, that is the reason for the benefit in other types of alcoholic drink.
The pre-menopausal women did not seem to benefit from any type of alcoholic drink.
Other studies have suggested that there may be a benefit to supplemental silicon intake, particularly where calcium intake is insufficient:
http://www.ncbi.nlm.nih.gov/pubmed/19034393?ordinalpos=4&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum
We say: Something is causing an improvement in the bone density of people that drink alcoholic beverages (in moderation!), but it may not be the alcohol!
The researchers did not look at the possible role of the mineral boron in this study. Wine is a good source of boron. There has been a certain amount of research surrounding this area, with mixed results – but enough to know that boron has a role in bone health. Boron is also found in fruit and vegetables, something that we know many people in the UK don’t get enough of. It may be that the boron in the wine was replacing that which should have been found in the fruits and vegetables of the participants!
Many people will be amazed how small a ‘moderate’ amount of alcohol is. A 125ml glass of wine contains 1.6units of alcohol – so in other words, a glass of wine this size on a daily basis may give benefits to bone, but any more will likely be counterproductive! It’s worth measuring out 125 ml of water and pouring it into the wine glass you usually use at home – stand back and be amazed how little it is.
Be very careful before taking a boron supplement (or any type of supplement) though. Many of these micro-nutrients can be very toxic in excess. We would always suggest that you try to increase your intake of these minerals through your diet, unless you are under GP advice.
Finally, the bones of the pre-menopausal women did not benefit from the inclusion of alcoholic drinks in their diet. Looks like younger ladies will have to stick to the healthy lifestyle!! Sorry girls!