New evidence challenges the idea that consuming more sweetness increases cravings or appetite.
Replacing sugar with artificial sweeteners does not appear to increase hunger, intensify cravings for sweet foods, or interfere with weight management, according to a review of three major European clinical trials. The research also found little evidence that consuming a sweeter diet harms metabolic health, challenging concerns that sweetness itself encourages overeating.
The findings come from the SWEET, SWITCH, and Sweet Tooth research programs, which examined how sugar substitutes and overall dietary sweetness affect body weight, appetite, food preferences, and metabolic health.
Sugar Substitutes and Weight Loss
In a yearlong weight maintenance trial, participants in the SWEET consortium who consumed non-nutritive sweeteners maintained slightly greater weight loss than those who avoided them. The difference was largest among participants who consistently followed their assigned diets.
The 52-week SWITCH trial produced similar results. Participants who drank beverages containing non-nutritive sweeteners lost somewhat more weight than those who drank water, although the difference was not considered clinically meaningful.
The Sweet Tooth trial instead examined whether increasing or decreasing dietary sweetness affected body weight without a weight loss intervention. Neither approach produced meaningful changes in weight or body composition.
Do Artificial Sweeteners Increase Cravings?
Researchers also investigated whether regular exposure to sweetness encourages people to seek more sugary foods or consume additional calories. Across the trials, sweeteners did not consistently increase hunger, cravings, or overall food intake.
In the SWEET trial, participants who avoided sweeteners developed a stronger preference for sweet foods over time, while those consuming them did not. Changing the overall sweetness of participants’ diets also had little measurable effect on appetite or taste preferences.
Professor Graham Finlayson of the University of Leeds explained: “A common concern is that replacing sugar with non-nutritive sweeteners might lead to a stronger preference for sugary sweet foods or stimulate appetite. Across these controlled studies, that prediction was not supported. Sweeteners are not a weight-management strategy by themselves, but they can provide a useful way to reduce sugar while retaining sweetness within a broader healthy diet.”
Effects on Blood Sugar and Heart Health
The trials also measured blood glucose, insulin, cholesterol, blood pressure, liver enzymes, and other indicators of metabolic and cardiovascular health. Most remained comparable between participants consuming sweeteners and those avoiding them.
Some short-term experiments found that replacing sugar with sweeteners reduced post-meal increases in blood glucose and insulin. One substudy also identified modest changes in gut bacteria, but these were not accompanied by worsening cardiometabolic risk markers.
Why Health Recommendations Differ
Health organizations have issued conflicting guidance about non-nutritive sweeteners. The World Health Organization has cautioned against relying on them for long-term weight control, while several professional organizations in the United Kingdom consider them useful for reducing sugar intake.
Much of the disagreement comes from differences between observational studies and randomized controlled trials. Observational research sometimes links sweetener consumption to metabolic health risks, but people already at higher risk may be more likely to use sugar substitutes. Randomized trials, which can better isolate cause and effect, generally report neutral or favorable outcomes when sweeteners replace sugar.
Important Questions Remain
Most participants were adults with overweight, often enrolled in structured dietary programs. The findings may not apply equally to children, adolescents, or people following different eating patterns. Some studies also experienced participant dropout and relied on self-reported dietary information.
The results suggest that replacing sugar with non-nutritive sweeteners can support weight management without detectable adverse effects on appetite or metabolic health during the periods studied. However, the trials cannot rule out effects under other conditions, and the consequences of long-term consumption remain uncertain.
Reference: “Effects of Non-Nutritive Sweeteners and Sweet Taste Exposure on Weight Management, Biomarkers of Health and Sweet Taste Preference—A Review of the Evidence from Recent European Consortia Studies” by Eva Marija Čad, Katherine M. Appleton, Ellen E. Blaak, Clarissa Dakin, Kees de Graaf, Graham Finlayson, Ciarán G. Forde, Jason C. G. Halford, Louise Kjølbæk, Monica Mars, J. Alfredo Martinez, Santiago Navas-Carretero, Anne Raben, Corey Scott and Joanne A. Harrold, 21 May 2026, Nutrients.
DOI: 10.3390/nu18111647
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