Green tea has long been heralded for its antioxidant polyphenols. But new evidence shows the active ingredient, catechin, may crank up metabolism. Researchers conducted a series of studies in dieters and found that those who went green lost more weight than those who didn't, suggesting that catechins may improve fat oxidation and thermogenesis, your body's production of energy, or heat, from digestion. But how much do you have to drink? According to one study, if you drink five eight-ounce cups of green tea a day, you can increase your energy expenditure by 90 calories a day. Sounds like a lot of tea, but it's not hard to do if you also drink it iced.
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"As we age, our lives become more complicated, whether it's with children, with work, with aging parents, and so we have less time really to be more physically active and pay attention to what we're eating. Food is available 24 hours a day, seven days a week, in large portions that are relatively economical and so food is always around, and we tend to have more mindless eating and cut down on activities," she says. How to Boost Your Metabolism By 50% After 40