Crash diets -- those involving eating fewer than 1,200 (if you're a woman) or 1,800 (if you're a man) calories a day -- are bad for anyone hoping to quicken their metabolism. Although these diets may help you drop pounds, that comes at the expense of good nutrition. Plus, it backfires, since you can lose muscle, which in turn slows your metabolism. The final result is your body burns fewer calories and gains weight faster than before the diet. Most Effective Cardio Exercises for Women Over 40
Not only is this antiquated exercise less effective than something like a front plank, sit-ups are terrible for your spine and can cause herniated discs. Fact: A traditional sit-up puts around 3,350 newtons of compressive force on the spine, but the U.S. National Institute for Occupational Safety and Health states says anything above 3,300 newtons is unsafe. Now you can understand why Mark Langowski, celeb trainer and author of Eat This, Not That! for Abs hates to see people do sit-ups. “I created an entire workout plan to give you a rock-hard core and it doesn’t involve one single sit-up,” he says. Protect your spine so that you can keep working out and losing weight for many years to come and get started by visiting our Fitness section on the ETNT site!

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The truth: First developed to treat childhood epilepsy, ketogenic or "keto" diets have become something of a fad among the Silicon Valley crew. The plan mimics starvation, sending the body into a metabolic state called ketosis. Some studies have linked the plan with a variety of health benefits from weight loss to a reduced risk of chronic disease, but it can also come with side effects like nausea, headaches, and fatigue — all of which could make it tough to stick to.
But there are certain things everyone over the age of 40 should be doing to guarantee that the second half of life’s big game is as exciting as the first half. After all, once you hit 40, your body begins to lose muscle mass, the lean tissue that helps you burn fat and calories; women drop about half a pound of muscle per year after crossing 4-0, according to Pamela Peeke, author of Body for Life for Women. That’s why 40 tends to be the dividing line between those who are headed for a long, healthy lifetime of lean, and those who are headed for an early (and probably much larger) grave.

You need to cut calories to lose weight. But going too low delivers a double whammy to your metabolism. When you eat less than you need for basic biological function (about 1,200 calories for most women), your body throws the brakes on your metabolism. It also begins to break down precious, calorie-burning muscle tissue for energy, says Dan Benardot, PhD, RD, an associate professor of nutrition and kinesiology at Georgia State University. "Eat just enough so you're not hungry—a 150-calorie snack midmorning and midafternoon between three meals (about 430 calories each) will keep your metabolism humming."
“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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