Caffeine is the world's most widely consumed psychoactive drug, lauded for its energy-boosting and focus-enhancing effects.

Millions of Americans rely on caffeine to kickstart their day, but how much is too much when it comes to coffee?

Caffeine is safe in moderate amounts, but excessive intake, especially from supplements or in children, can pose serious ...

This amounts to between one and three cups of Joe. According to FDA guidelines, healthy adults should limit caffeine consumption to 400 milligrams max, which equates to around four cups of coffee.

Safe limits of caffeine consumption are still being studied, but data suggest that most healthy adults can safely consume up to 400 milligrams per day; pregnant women, up to 200 milligrams ...

Caffeine’s effects on memory are more intricate than its immediate cognitive boost. Evidence suggests that moderate, timed intake of caffeine can positively influence working memory ...

However, later studies from the found that neither coffee nor caffeine intake appear to cause osteoporosis — and even if they did, osteoporosis may not necessarily affect your height.