Seriously, how is anyone dumb enough to be fat?

[Aractus]

... Wait... you're expecting me to take advice from the guy who says there are no naturally thin people? I've been this way my whole life, even before I drank beer, and I get regular checkups. I'd say try again, but it's not like your advice means anything.

Well, I'm not the one who made a claim to "naturally thin" people, that was thesummerqueen, and my point was that it is up to her to define the term because the idea that thin people can't gain weight is a myth, obviously.

If a person eats a diet very high in fibre they can be seen to eat a lot all day long every day and they'll never gain weight because they're calorie deficient and probably nutrient deficient.

If you're anything like my brother - he'll be 28 in a few weeks, he's my height 5'11 and he weighs about 60kg maybe 65kg at present (he's not looking too bad at the moment), but he usually weighs about 55kg. He most certainly is not "naturally thin" IMHO, he obviously has bad normal eating habits, he smokes instead of eating and drinks a lot of beer probably also instead of eating a proper meal. He also drinks a number of coffees in the morning - that's about everything I know about his diet. He used to have Maccas for lunch every day.

His diets have always been high sugar, sugar is empty energy - it adds a lot of calories, but no nutrients like vitamins, calcium, protein, etc. Importantly there's no way for your body to convert sugar alone to fat, I'll try to explain this a bit better, here's a link.

To make fat your body needs to store triglycerides, and if it doesn't have enough it will simply use all the ones it can. Obviously if someone wants to lose weight, they're needing to use the deficiency to burn the triglycerides stored in fat. Importantly low sugar diets mean that not much triglycerides can be formed and thus your body will produce the required glucose. However very low fat diets - malnourished diets also have a slightly different effect by depriving the body of the other building block, that of the fatty acids, and that your body does not produce on its own. Thus if you do not have enough fatty acids in your diet it will make no difference how much sugar you eat you cannot get fat from it - and my brother is certainly proof of that.

In the real world this would mean that a diet of healthy foods that amount to around 600 calories/day or less from food and 2,000+/day from sugars in tea, coffee, alcohol, coke, etc wouldn't contain enough fatty acids to cause weight gain. Simple science.