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Study links long-term artificial sweetener intake to increased body fat adipose tissue volume
(www.sciencedaily.com)
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That's my point - it makes no sense. They're either overlooking something, or artificials have some influence on the calories out side of weight loss that we don't know about.
They have a pretty detailed discussion section. The main hypothesis they support, based on plenty of other evidence, is that these drugs increase appetite. They motivate you to eat more calories, even though they contain fewer calories themselves.