The Dose of Caffeine

Thomas Merritt is a geneticist and professor in the School of Natural Sciences at Laurentian University. Coffee wakes you up by binding to adenosine receptors inside the body, which in turn interrupts your sleep. There's not enough evidence to state conclusively that caffeine affects your health one way or another. Caffeine consumed within 10 to 15 minutes of exercising may improve your physical performance but too much could worsen things.