this is to "ultima". diet soda does not get you fat. i've read articles of studies all over the place. it is impossible to gain wieght from diet soda because it has no calories. it doesn't have high fructose corn syrup like you say. it's just basically horribly flavored carbonated water(unless it's Coke Zero which tastes good). you probably slightly gained wieght because you would eat things after you drink the diet soda. i got on a diet about 4 months ago.gave up soda 3 months ago but i still lost wieght when i drank soda because i didn't drink allot of it.i started drinking diet soda(stopped now because the fizz would make my stomach hurt a bit and throat hurt) after i gave up soda and i still lost wieght.its been almost 4 months and i've lost around 23pounds.