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The low-carb, high-fat plan promises quick weight loss, but health experts worry about these side effects and complications. 1. The “keto flu” “Some people report that when they start ketosis, they just feel sick,” says Kristen Kizer, RD, a nutritionist at Houston Methodist Medical Center. “There can sometimes be vomit, gastrointestinal distress, a lot of fatigue, and lethargy.” This so-called keto flu usually passes after a few days, she adds. Josh Axe, a doctor of natural medicine and clinical nutritionist, estimates that about 25% of people who try a keto diet experience these symptoms, with fatigue being the most common. “That happens because your body runs out of sugar to burn for energy, and it has to start using fat,” he says....

How to Lose Weight and Keep It Off There’s a better way to lose weight. These dieting tips can help you avoid diet pitfalls and achieve lasting weight-loss success. What’s the best diet for healthy weight loss? Pick up any diet book and it will claim to hold all the answers to successfully losing all the weight you want—and keeping it off. Some claim the key is to eat less and exercise more, others that low fat is the only way to go, while others prescribe cutting out carbs. So, what should you believe? The truth is there is no “one size fits all” solution to permanent healthy weight loss. What works for one person may not work for you,...