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Study Reveals Chimps' Daily Ethanol Intake: A 'Drunken Monkey' Insight

9/20/2025

Summary

Story summary

A UC Berkeley study found wild chimpanzees consume approximately 14 grams of ethanol daily from fermented fruit, similar to two human drinks.
Conducted in Uganda and Ivory Coast, the research examined 21 fruit species with an average alcohol content of 0.26% by weight.
Chimpanzees eat about 4.5 kg of fruit daily, constituting 70% of their diet.
The findings support the "drunken monkey hypothesis," linking human alcohol attraction to ancestral fruit-eating.
Despite regular intake, chimps show no intoxication signs due to gradual consumption. Future research will investigate their preferences for higher ethanol fruits and analyze urine for alcohol metabolites.

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Story summary

A UC Berkeley study found wild chimpanzees consume approximately 14 grams of ethanol daily from fermented fruit, similar to two human drinks.
Conducted in Uganda and Ivory Coast, the research examined 21 fruit species with an average alcohol content of 0.26% by weight.
Chimpanzees eat about 4.5 kg of fruit daily, constituting 70% of their diet.
The findings support the "drunken monkey hypothesis," linking human alcohol attraction to ancestral fruit-eating.
Despite regular intake, chimps show no intoxication signs due to gradual consumption. Future research will investigate their preferences for higher ethanol fruits and analyze urine for alcohol metabolites.