Shocking!! The Top 38 Diet Sodas—Ranked for Health

[Marr]

4. Last I read, the claim that diet sodas cause the body to release more insulin was unproven.

The doctor there states it as fact, but as far as I know, it's still just a guess; an answer to the question of 'why do people who drink diet sodas tend to be a bit fatter than people who don't drink any soda at all?'.

Personally, I think the answer is 'because diet soda drinkers tend to be people who are trying to lose weight'. There could be something to the insulin speculation as well, of course, but even if that's true, it doesn't explain obesity. You'd be talking about a couple of extra pounds-- not the morbid obesity we see running rampant today. To be really overweight (barring a few rare conditions or drugs), you have to be simply eating way too much.