Human experience with concentrations of ethanol higher than 5% that is attained by decaying fruits is therefore very recent. More importantly, any unintentional, accidental, and haphazard consumption of alcohol in the ancestral environment, before the advent of agriculture about 10,000 years ago, happened as a result of eating, not drinking, whereas alcohol is almost entirely consumed today by drinking, not eating. (Deep-fried beer is a very recent exception.) The Hypothesis would therefore predict that more intelligent individuals may be more likely to prefer drinking modern alcoholic beverages (beer, wine, and distilled spirits) than less intelligent individuals, because the substance and the method of consumption are both evolutionarily novel.

Consistent with the prediction of the Hypothesis, more intelligent children, both in the United Kingdom and the United States, grow up to consume alcohol more frequently and in greater quantities than less intelligent children. Controlling for a large number of demographic variables, such as sex, race, ethnicity, religion, marital status, number of children, education, earnings, depression, satisfaction with life, frequency of socialization with friends, number of recent sex partners, childhood social class, mother’s education, and father’s education, more intelligent children grow up to drink more alcohol in the UK and the US.