Chimpanzees Ingest Everyday Alcohol Comparable to a Pint from Ripe Fruit
Research of wild chimpanzees reveal they imbibe the alcoholic equivalent of half a pint on a regular basis through their diet of naturally alcoholic fruit.
Study from Ugandan and Ivorian Forests
Scientists measured alcohol content in fruit gathered from the ground eaten by apes in Kibale National Park and Taï National Park.
While individual fruits had less than 0.5% ethanol, the apes’ daily intake increased as they devoured significant amounts of fermented fruit flesh.
Fig fruits were a commonly eaten fruit among the chimpanzees, showing some of the most notable alcohol levels found.
Daily Ethanol Intake Equivalent to a Beer
Based on research estimates, male and female chimpanzees consume about 14 grams of pure ethanol per day.
This dosage is equivalent to a typical alcoholic beverage.
“The apes eat 5 to 10% of their mass in ripe fruit daily, so even low concentrations yield a considerable daily total of alcohol,” noted one researcher.
Historical Link to Primate Drinking Behavior
This behavior aligns with the primate alcohol attraction theory, which suggests that human attraction to drinking may have roots in our primate ancestors.
The attraction for energy-rich ripe fruit may have led to a natural inclination toward ethanol intake.
Not the First Examples of Animal Alcohol Consumption
Previous studies have shown apes engaging in regular alcohol consumption, with some starting as in the morning.
Additional species also consume ethanol in the wild, including slow lorises that prefer strong fruit when available.
No Signs of Drunkenness
Despite eating up to 4.5kg of alcoholic fruit per day, the apes display little visible effects of intoxication.
Researchers note that to feel the noticeable impact of alcohol, the chimpanzees would need to eat an excessive amount fruit—to the point to make them uncomfortably full.
Context with Human Alcohol Guidelines
Medical experts recommend that people limit alcohol intake to reduce health risks.
Studies show that there is no completely safe level of alcohol consumption for people.
