Can coffee really speed up my metabolism?

A study in the journal Metabolism found that the caffeine in 2 cups of coffee may cause a 65.77 kilogram woman to expend up to 50 extra calories over the next four hours. "Caffeine stimulates your nervous system, signaling the body to release a small amount of energy from its fat stores," says lead researcher Paul Arciero, Ph.D., an associate professor of exercise science at Skidmore College. "But stirring in milk, cream, or sugar can cause your insulin levels to rise, which diminishes that metabolic effect."
Don't try to accelerate the weight loss process by sipping black coffee all day, though. Arciero recommends not exceeding 3 cups in a day, as too much caffeine can cause anxiety, nausea, and headaches.

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