Early ReportEffect of alcohol consumption on systemic markers of inflammation
Introduction
In epidemiological studies, consumers of moderate amounts of alcohol have lower all-cause mortality than non-drinkers and heavy drinkers.1, 2, 3, 4 There is general agreement that this U-shaped relation is due primarily to a lower risk of coronary heart disease.1, 2, 3, 4, 5, 6, 7 The alcohol intake at which all-cause mortality and risk of coronary heart disease are lowest remains unclear and seems to vary between men and women and among countries.2, 5, 6 Several mechanisms have been suggested by which alcohol intake could lower risk of coronary heart disease. Besides changes in lipoproteins such as increasing HDL cholesterol and apolipoprotein A1, several studies have shown an association between alcohol intake and a favourable haemostatic profile.8 Mennen and colleagues found a U-shaped association between alcohol consumption and fibrinogen concentrations in a large cross-sectional study.9 However, the available data suggest that there are also likely to be other mechanisms.
There is increasing evidence that atherosclerosis is an inflammatory disease.10 Inflammatory cells, including macrophages and T cells, are prominent in the atherothrombotic plaque.11 The total leucocyte count and the concentration of fibrinogen, a haemostatic protein but also an acute-phase reactant, are independent risk factors for coronary heart disease and myocardial infarction.12 Moreover, strong associations between concentrations of C-reactive protein (CRP), the classic marker of the acute-phase response, and risk of coronary events have been reported in several prospective population-based studies in apparently healthy people, as well as in patients with manifest atherosclerotic disease.13 In addition, low concentrations of serum albumin, a negative marker of the acute-phase response, have consistently been associated with risk of death from any cause and with cardiovascular mortality.12 Even in patients presenting with unstable angina, CRP measured on admission was predictive of worse outcome both in hospital14 and in the long term.15
We have investigated the association between average daily alcohol intake and concentrations of CRP and other positive and negative markers of systemic inflammation in a large population-based sample of adults representative of the former West Germany.
Section snippets
Study design and population
This study is based on a national health and nutrition survey carried out in former West Germany in 1987–88 (Verbundstudie Ernährungserhebung und Risikofaktoren Analytik).16 A multistage, stratified probability sample was drawn from the population of German nationality aged 18–89 years, with exclusion of people living in institutions. 2006 men and women were recruited, with a participation rate of about 70%. The analyses presented are based on individuals with complete data for all variables
Results
About 6% of men and 13% of women did not consume any alcohol within the recorded 7-day period. A higher proportion of men than women were current smokers, whereas a higher proportion of women had never smoked (table 1). Women had lower mean body-mass index than men and were less likely to report a history of hypertension. Concentrations of α1-globulins, α2-globulins, transferrin, HDL cholesterol, and LDL cholesterol were higher in women than men, whereas those of albumin,
Discussion
Several prospective studies have found that light to moderate intake of alcoholic beverages was associated with lower all-cause mortality than abstention or heavy intake;1, 2, 3, 4, 5, 18 the lower all-cause mortality at moderate alcohol intake seems to be due primarily to a lower risk of coronary heart disease. The relation between alcohol consumption and incident coronary heart disease has been described as L-shaped in some studies1, 2, 3, 19 and as U-shaped in others.4, 20, 21 In the
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