Along with all those other healthy habits experts have been recommending over the years. “It was only after turning 40 and realizing that my gums were starting to recede that I realized why flossing is so important,” Honaman says. Once you reach 40, you have the self-discipline to implement healthy habits that may have seemed inconvenient a decade earlier.
It’s like butter that grows on trees. But instead of the cholesterol, trans fats, and saturated fats in real butter, avocado contains metabolism-enhancing monounsaturated fat. And that’s not all. Each creamy fruit is also packed with fiber and free-radical-killing antioxidants. Free radicals are destructive rogue oxygen molecules—natural byproducts of metabolism—that trigger various chain reactions in the body that destroy cells and DNA, causing all kinds of health problems. Antioxidants in fresh fruits and vegetables can help neutralize some free radicals, but they can’t reach the mitochondria—the base camp for the free radical army—and that’s a problem. When your mitochondria aren’t working properly, your metabolism runs less efficiently. Enter: Avocado. New research conducted in Mexico found that monounsaturated-rich oil pressed from the fruit can help mitochondria become more resilient. Researchers say the results jive with low-disease rates in Mediterranean countries where olive oil—nutritionally similar to the avocado—is a diet staple. How to Lose Weight After Menopause.
Research has found that people burn fewer calories when they sleep during the day and log their waking hours after the sun’s gone down. To come to this finding, researchers at the University of Colorado at Boulder studied 14 healthy adults for six days. For two days, study participants slept at night and stayed awake during the day, then they reversed their routines to mimic the schedules of night owls. When participants slept during the day, researchers found that they burned 52 to 59 fewer calories than they did while catching their Zzzs in the evening—likely because the schedule messed with their circadian rhythm, the body’s internal clock that plays a major role in metabolism function. If you have no choice but to sleep during the day, aim to cut 50-60 calories from your daily diet.

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Throwing your all into a meal plan that takes too much time to assemble, involves eating more frequently than your schedule allows, or contains expensive ingredients that you—and your budget—can't sustain in the long term could chip away at your best intentions: "It sets you up for failure before you begin," Dr. Seltzer says. "And giving up can leave an emotional impact."

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You’ve heard they're bad for you. But trans fats also slow down your body's ability to burn fat. "They have an altered shape and make your biochemistry run funny," Hyman says, explaining that trans fat binds to fat and liver cells and slows metabolism. Eating trans fat can also lead to insulin resistance and inflammation, both of which cripple metabolism and can cause weight gain. 

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Slayton says that fortysomething clients come into her office saying things like, “I’m doing the same things I always did to lose weight and they’re not working.” “Of course they’re not,” she says. “With each decade, the weight rules change. Generally, we have to eat less and be more careful to get the same result. Once you realize this, isn’t it kind of liberating?”
“Most 40-year-olds can remember the fat-free craze of the ’90s, when Snackwells was king,” says Shapiro. “Well, those days are over.” She advises that you leave the fat-free fake foods behind and enjoy healthy fats that add flavor to your meals and help you fill up with less. “Coconut oil, avocado, nuts, seeds, salmon are rich in vitamins and minerals that will keep you young and fill you up on smaller portions, and therefore fewer calories.” She says.

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