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Carbs Make You Fat Low-carb diets can help with weight loss. That is a scientific fact (9, 10). In many cases, this happens even without conscious calorie restriction. As long as the carbs are kept low and protein intake is high, people lose weight (11, 12). However, this does not mean that carbs per se cause weight gain. The obesity epidemic started around 1980 but humans have been eating carbs for a very long time. The truth is, refined carbs (like refined grains and sugar) are definitely linked to weight gain, but whole foods that are high in carbs are very healthy. BOTTOM LINE: Low-carb diets are very effective for weight loss. However, carbs are not what causes obesity in the first place. Whole, single ingredient carb-based foods are incredibly healthy. 7. Fat Makes You Fat Body fat is stored fat. So, eating more fat should make us store more of it. It seems logical. However, it turns out that things aren't this simple. There is nothing uniquely fattening about fat, except that it is often found in calorie-dense junk foods. As long as calories are within range, fat does not make you fat. Additionally, diets that are high in fat (but low in carbs) have been shown to cause weight loss in numerous studies (13). As with so many things in nutrition, this depends entirely on the context. Eating a lot of fat along with a high-carb, high-calorie, junk food-based diet will definitely make you fat. But it's not just because of the fat. BOTTOM LINE: