“Hormonal changes in your 40s can affect your appetite hormones, ghrelin, and leptin,” explains Lauren Slayton, MS, RD, and founder of Foodtrainers. “Both supplemental vitamin D3 and extra lean protein can help keep your appetite under control.” Wild salmon fits the bill, boasting some of the highest levels of weight loss-aiding vitamin D3 as well as muscle-maintaining protein.
According to a study in The New England Journal of Medicine, folks who eat at least 100 grams of fruit per day—about half an apple, or a whole banana—saw their heart attack risk plummet by about 33 percent. While apples contain cholesterol-busting pectin, bananas are an excellent source of blood-pressure-slashing potassium. Slating both into your diet is a solid choice. And for more ways to be a smarter eater—and all around person—bone up on the 20 Things Your Doctor Is Likely to Get Wrong. 
You might want to think twice before ditching dairy if you’re trying to lose weight—despite what your Paleo-preaching CrossFit friends tell you. Cheese is a satisfying, portable, and inexpensive food that’s packed with calcium, vitamin D, and protein. “Calcium can also promote weight loss because it helps maintain muscle mass, which boosts and helps maintain metabolism, helping you burn calories more efficiently throughout the day,” says Tanya Zuckerbrot, RD, author of The Miracle Carb Diet: Make Calories & Fat Disappear—With Fiber! That doesn’t mean you can help yourself to a cheese-drenched casserole, though. Work cheese into fiber-rich snacks to make them more satiating.

how to speed metabolism after 40

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