Overview

• Peer‑reviewed research in Science Advances estimates wild chimpanzees ingest about 14 grams of ethanol each day by eating naturally fermented fruit.
• Field teams measured ethanol in 21 fruit species at Ngogo, Uganda, and Taï, Côte d’Ivoire, then combined those data with observed fruit‑intake rates.
• Average fruit ethanol content was roughly 0.26% by weight, and chimpanzees typically consume about 4.5 kilograms of fruit per day.
• The intake equals roughly one standard drink per day, which scales to nearly two drinks for a human of typical body mass.
• Researchers report no clear signs of intoxication from this chronic low‑level exposure and plan follow‑up studies on preference and biological effects.