[mannimow]

Every article on fats vs. carbs dilemma stresses out weight management issue, none of them mention any other effects, but weight. As a skinny guy, what are the dangers of say french fries, honey, and fast food? What about when coupled with active life style and moderate exercise?

[briHass]

As with everything, it depends largely on your genetics and natural inclination to becoming insulin resistant. Insulin resistance (IR) can occur in normal-BMI individuals. This is typically accompanied (caused?) by a large amount of visceral fat (internal, around your organs), which isn't what we typically see when we look at an overweight individual. IR is really just the first step to full type 2 diabetes.

Exercise and youth can negate much of a bad diet, but it will likely catch up to you eventually. Better markers than your weight might be HDL (should be high), triglyceride levels (should be low), and fasting blood sugar. If those are optimal, you're probably doing fine, but there isn't really a case to be made that you should continue to eat poor food choices if you can avoid it.

[visakanv]

Fellow skinny guy here who's working my way out of it. I don't know if you relate to this, but when I used to eat french fries and fast food, I would have bouts of lethargy and mental dullness. I just sort of thought that's how life is. When I started eating healthier, I enjoy much better mental clarity. It's a world of difference, and it gives me 2-5x more quality time to do my best work.