Increasing numbers of people around the world are suffering from chronic diseases such as diabetes and obesity, and the main culprit is usually the food they eat. The standard American diet, for example, consists of excessive amounts of protein, processed grains and carbohydrates — particularly in the form of refined, added sugars — none of which is good for your health.
The popular low-carb diets (such as Atkins or Paleo) modify a true keto diet. But they come with the same risks if you overdo it on fats and proteins and lay off the carbs. So why do people follow the diets? "They're everywhere, and people hear anecdotally that they work," McManus says. Theories about short-term low-carb diet success include lower appetite because fat burns slower than carbs. "But again, we don't know about the long term," she says. "And eating a restrictive diet, no matter what the plan, is difficult to sustain. Once you resume a normal diet, the weight will likely return."
In the absence of glucose, which is normally used by cells as a quick source of energy, the body starts to burn fat and produces ketone bodies instead (it’s why the keto diet is often referred to as the ketone diet). Once ketone levels in the blood rise to a certain point, you enter into a state of ketosis — which usually results in quick and consistent weight loss until you reach a healthy, stable body weight. See this keto diet review, a before and after trying keto for 30 days.

It’s not always about how much you eat, but the nutritional balance of carbohydrates, fats, and protein in what you’re eating. Endurance athletes need extra carbs to fuel their rides, fat to feel satiated, and protein to repair your muscles post-workout. It usually isn’t necessary to make radical adjustments to achieve this balance—small changes work best. For instance, don’t eat a whole bowl of chili with meat. Instead, fill half the bowl with brown rice, then ladle a small amount of chili on top. You can also try substituting fat-free yogurt for sour cream and fruit for sweets.

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