diet soda dose make you fat, it happens very slowly and when you try to loose weight it is impossible. i know it happened to me. i gave up the diet soda and i was able to loose weight.
i gave up diet soda about 3 yrs ago for 6 months. i was able to loose 20lbs i could not loose before with a 1000 calorie diet and 1 hour of exercise a day i could not loose 1 pound. after the 6 months of no diet coke, i went back to diet soda. and slowly the weight creep back on, like it did before.
i have proven it with my own body.
its been two years and my diet soda habit has caused me to gain the weight back.
for the record diet soda was not always like this, when they changed the formulas back in the mid to late 90s thats when this happened. diet coke also became less fizzy over this time. its the new sweetners from 96 forward that did it. probably the high fructose corn syrup and stuff like that.
if diet coke went back to the old formulas we would all be slimmer.