"Nowadays medical research focuses on single issues. Salt, sugar, fat… these are irrelevancies. By the way, did you know that if you don’t have enough sodium in your diet your body takes it from your bones, making them brittle? The zero salt diet will make you die like a washed up jellyfish. Something modern medicine seems to want to happen.
None of it matters. Burn more calories than you eat, you lose weight. Eat more calories than you burn, you gain weight. It’s really no more complicated than that.
I guess there’s no research money in the obvious answer."