The Afternoon Coffee Question: How Late Is Too Late for Caffeine?
Caffeine's half-life means an afternoon coffee is still circulating at bedtime. A controlled trial put concrete numbers on how late caffeine measurably disturbs sleep.
Latest Verdicts
Intermittent Fasting on Trial: Better Than Ordinary Calorie Counting?
Time-restricted eating is one of the most popular diet approaches of the decade. Head-to-head trials against plain calorie restriction deliver an unglamorous verdict.
Vitamin C and the Common Cold: What Decades of Trials Add Up To
Vitamin C is the classic cold-season supplement. The trial record spans over half a century — and its verdict is more specific than the marketing suggests.