Health Experts Advise Daily Coffee Limits and Timing for Benefits

Health authorities advise that drinking one cup of coffee daily can improve alertness and may lower the risk of type 2 diabetes, Parkinson’s and Alzheimer’s disease, as well as support liver health. Recommended caffeine intake for most adults is up to 400 mg per day (about three to five standard cups), and a single cup (80‑150 mg) stays well within this limit.

Guidelines suggest avoiding coffee on an empty stomach for those prone to acid reflux, limiting intake in the late afternoon or evening (at least six hours before sleep) to prevent sleep disturbance, and steering clear of high‑sugar or high‑fat additives that add calories and may affect weight. People with hypertension, heart‑rhythm disorders, pregnancy, or medication interactions should consult a physician about appropriate caffeine amounts. The advice draws on research from Harvard T.H. Chan School of Public Health, Mayo Clinic, the American Heart Association and FDA recommendations.