Trials did not show that non-nutritive sweeteners raise hunger or block weight loss

What the research found

SciTechDaily reported this on 30 October 2026. It is a review of trials, not a new experiment, and it is not the 2025 Neurology paper on sweeteners and thinking scores. The review is Nutrients, 21 May 2026, DOI 10.3390/nu18111647, by Cad, Finlayson, Harrold, and colleagues, drawing on the SWEET, SWITCH, and Sweet Tooth programs. In SWEET, over one year of weight maintenance, non-nutritive sweeteners were tied to slightly greater weight loss, and the gap was largest in people who stuck with them. In SWITCH, over 52 weeks, sweetener drinks versus water were tied to somewhat more weight loss, and the authors did not call that gap clinically meaningful. In Sweet Tooth, raising or lowering how sweet the food was, without a weight-loss plan, did not change weight or body composition. Sweeteners did not consistently raise hunger, cravings, or how much people ate. In SWEET, people who avoided sweeteners developed a stronger preference for sweet foods; people who kept using them did not. Glucose, insulin, cholesterol, blood pressure, and liver enzymes were mostly comparable. Some short-term replacement of sugar lowered glucose and insulin after meals. One substudy saw a modest shift in gut bacteria without worse cardiometabolic markers. The review notes that WHO guidance and UK guidance disagree, and it treats that split as observational evidence versus randomized trials. Dropout and self-report limit the results. This review does not cancel a separate observational report that tied some sweeteners to faster decline on thinking tests. Graham Finlayson, University of Leeds, said sweeteners are not a weight plan by themselves. Not medical advice.

Evidence level: Clinical trial. This is among the stronger kinds of evidence, but one study rarely settles a question.

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