The total number of calories has a lot less to do with weight gain than the kinds of calories consumed. It's kind of sad to think that people still believe they can lose weight eating 70-calorie snack bars that contain 30g of simple carbohydrates. It's as good as telling your body to store fat. How many people do you know who've tried low-calorie diets and exercise have actually lost weight and kept it off? Thermodynamics should stay in the field it belongs, because it certainly does nothing to explain the human metabolism.
There are plenty of high-cal Japanese foods, and staples like rice and noodles tend to have a fairly high glycemic index as well, meaning they spike blood sugar, which leads to extra insulin secretion, and is bad news for dieters and diabetics alike (the snack bar and low-fat yoghurt crowd still aren't aware of this though). So why don't they get fat? Probably the same reason the French aren't fat: because of their unique diet. Diet isn't something that's reduced to number of calories, amount of carbohydrates, consumption of omega-3s or any other reductionist spin on nutrition. It's a series of complex interactions between food and the human body, and is closely interlinked with culture; how you eat your food can be just as important as what you eat.
If we knew anything near what we need to know about nutrition, the French diet wouldn't be termed a paradox, and diabetes and heart disease wouldn't be practically endemic throughout most of the Western world. What we can say for sure is that the Western diet clearly isn't as healthy as the Japanese diet, and that includes Westerners eating low-fat, low-cal "healthy" foods (or food-like substitutes, if you look a little closer).
There are plenty of high-cal Japanese foods, and staples like rice and noodles tend to have a fairly high glycemic index as well, meaning they spike blood sugar, which leads to extra insulin secretion, and is bad news for dieters and diabetics alike (the snack bar and low-fat yoghurt crowd still aren't aware of this though). So why don't they get fat? Probably the same reason the French aren't fat: because of their unique diet. Diet isn't something that's reduced to number of calories, amount of carbohydrates, consumption of omega-3s or any other reductionist spin on nutrition. It's a series of complex interactions between food and the human body, and is closely interlinked with culture; how you eat your food can be just as important as what you eat.
If we knew anything near what we need to know about nutrition, the French diet wouldn't be termed a paradox, and diabetes and heart disease wouldn't be practically endemic throughout most of the Western world. What we can say for sure is that the Western diet clearly isn't as healthy as the Japanese diet, and that includes Westerners eating low-fat, low-cal "healthy" foods (or food-like substitutes, if you look a little closer).

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