Not much of a coffee drinker? Tea is also a natural diuretic, and types of herbal tea such as dandelion or fennel root can also lend a hand. In fact: When a recent study compared the metabolic effect of green tea (in extract) with that of a placebo, researchers found that the green-tea drinkers burned about 70 additional calories in a 24-hour period.
Break out the lemon wedges: Regular fish eaters tend to have lower levels of the hormone leptin — good because high levels of leptin have been linked to low metabolism and obesity, says Louis Aronne, M.D., an obesity specialist at the New York Presbyterian Weill Cornell Medical Center. Try to consume three to four servings of a fatty fish, such as salmon, tuna or mackerel, each week.