Not the case. If you swapped out a coke for a diet coke in your #3, you wouldn't eat more calories because your portion size is static. A whopper and large fries is still a whopper and large fries regardless of the beverage.
If you take a "low calorie\fat\carb snack" and put it next to a "normal snack", exclude any portion control and plop down a fatty they'd *probably* eat more calories from the low calorie snack (assuming that low calorie snack really isn't) because they're "aware" with the regular calories. Not that the regular snack is better, people just exclude responsibility with the diet food.
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