If is was just Sugar that makes you fat, wouldn't fruitarians be obese and not emaciated?
No one here is saying it's just fat. We all mention it's also high amounts of processed grains and sugar, but most people here have already cut out the processed grains and sugars, that's why it might seem like we don't mention the Sugar angle.
I personally think it's a diet both in too much Sugarand fat. Do you know anyone who eats too much processed grains and sugar who doesn't also eat too much fat?