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.
“Women in their 40s come to know that, while socializing with friends is fun and rewarding, partying out late brings more burden than good,” Dr. Rosenfeld says. “They might choose to invite friends over for a quiet night in or spend their nights engaging in self care (reading, relaxing, taking a bath). Either way, they’ll get more sleep, won’t be hungover, and will face the next day energized and refreshed.”

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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
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"The main culprit that slows metabolism and often leads to yo-yo dieting is what I call shrinking muscle syndrome," says Caroline Apovian, MD, director of the Nutrition and Weight Management Center at Boston Medical Center and the author of The Overnight Diet: The Proven Plan for Fast and Permanent Weight Loss. Starting at age 30, most people begin to lose about half a pound of the metabolism-revving tissue each year. Poof! Gone, just like that. And at age 50, the rate doubles. "The average sedentary woman may have lost nearly 15 pounds of muscle by the time she reaches her late 50s, a change that could cause her to gain nearly the same amount in body fat," says Wayne Westcott, PhD, a Prevention advisory board member and the director of fitness research at Quincy College in Massachusetts.

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