One downside to a ketogenic diet for weight loss is the difficulty maintaining it. “Studies show that weight loss results from being on a low-carb diet for more than 12 months tend to be the same as being on a normal, healthy diet,” says Mattinson. While you may be eating more satiating fats (like peanut butter, regular butter, or avocado), you’re also way more limited in what’s allowed on the diet, which can make everyday situations, like eating dinner with family or going out with friends, far more difficult. Because people often find it tough to sustain, it’s easy to rely on it as a short-term diet rather than a long-term lifestyle.

Metabolic Syndrome Limited research, including a study published in November 2017 in the journal Diabetes & Metabolic Syndrome: Clinical Research & Reviews, has suggested that adults with metabolic disease following keto shed more weight and body fat compared with those on a standard American diet, which is heavy in processed food and added sugars. (6)

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You lose weight temporarily because “if you’re not hungry every five minutes and can work on your willpower,” you won’t eat as much, Nisevich Bede says. But while some research is promising — one study published in October 2013 in the British Journal of Nutrition found that the keto diet led to greater weight loss than a low-fat diet, for example (4) — there is a lack of long-term research (greater than two years) that suggests a highly restrictive diet like keto is superior for weight loss than others, and it’s certainly not right for everyone.

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Carbohydrates have been linked to this skin condition, so cutting down on them may help. And the drop in insulin that a ketogenic diet can trigger may also help stop acne breakouts. (Insulin can cause your body to make other hormones that bring on outbreaks.) Still, more research is needed to determine exactly how much effect, if any, the diet actually has on acne. 

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Polycystic Ovary Syndrome (PCOS) Because women with the infertility condition PCOS are at a greater risk for diabetes and obesity, some clinicians recommend the keto diet, says Taylor Moree, RD, LD, of Balance Fitness and Nutrition in Atlanta. But PCOS is no different from most health conditions mentioned here: Long-term research on the safety is needed. 

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