Douglas Bell and Tom McLellan of Defense Research and Development Canada, in Toronto, gave 13 coffee drinkers and eight non-coffee drinkers either a caffeine solution or a placebo. One, three, or six hours after ingestion, the researchers instructed the subjects to exercise to exhaustion. The team found that caffeine increased the amount of time people in both groups could exercise, but non-coffee drinkers enjoyed the largest boost. Additionally, coffee continued to stimulate non-users up to six hours later, whereas by that time the habitual java drinkers had long since come off their high. So it seems that everyone gets a lift from coffee. But in order to get the most bang for your buck in today¿s gourmet coffee market, perhaps moderation is still the best policy.