As far back as 2000, biologist Robert Dudley pointed out that humanity’s craving for alcohol is ingrained in us through evolution: our distant ancestors consumed fermented (spoiled) fruits. The ethanol present in overripe produce acted as a signal of ripeness and nutritional value for animals—such fruits contain higher calories and beneficial substances.
The initial direct confirmation of this theory emerged in 2022 when ethyl alcohol metabolites were detected in the urine of spider monkeys. Subsequently, in 2025, researchers discovered ethyl glucuronide in chimpanzees in Uganda—a marker of alcohol consumption equivalent to the doses a human ingests from alcoholic beverages.
But why did our ancestors not just eat fermented fruits, but also develop tolerance to them? Scientists suggest that primates underwent a mutation in a gene that allows for the efficient breakdown of ethanol. Consequently, humans metabolize alcohol 40 times faster and more effectively than most other mammals. This provided an evolutionary edge by enabling the consumption of more caloric food without the risk of poisoning.
However, scientists emphasize that there is currently no conclusive proof that primates actively seek out fruits high in ethanol content. The upcoming expedition to Uganda aims to determine how alcohol impacts the behavior and health of wild chimpanzees. Researchers seek to ascertain whether the predisposition for alcohol is an incidental byproduct or genuinely a significant evolutionary advantage.
In today’s world, what once aided survival has become the source of widespread addiction. Our genetic memory continues to compel us toward seeking out “ripe fruits,” but now this translates to reaching for a bottle of beer or a glass of wine. Therefore, it is possible that alcoholism is not merely a detrimental habit, but a deeply rooted evolutionary inheritance.
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