A study published in Food Quality and Safety reveals that hunger enhances the appeal of sweet taste regardless of caloric content, and habitual consumers of non-nutritive sweeteners (NNS) show increased brain activity in a region linked to self-control. The research, conducted by scientists from Jiangnan University in China and the University of Oxford, directly compared responses to sweetness-matched solutions under hungry and satiated conditions in regular sugar consumers and regular NNS consumers.
Participants rated all sweet solutions as more enjoyable when hungry, irrespective of whether they contained sugar or NNS. This hunger-driven boost was accompanied by physiological signs of sympathetic arousal, including shortened R-R intervals and increased heart rate. However, contrary to expectations, hunger did not selectively favor caloric sugar over non-caloric sweetness, indicating that the craving for energy makes sweetness itself more appealing, not the calories behind it.
More notably, habitual NNS consumers displayed distinct neural activity. Functional near-infrared spectroscopy (fNIRS) revealed significantly stronger oxygenated hemoglobin responses in the left dorsolateral prefrontal cortex (DLPFC), a key region for cognitive control and dietary self-regulation. This difference emerged even though all samples were tasted blindly and matched for sweetness intensity, ruling out simple perceptual explanations. The findings suggest that long-term NNS use may be associated with enhanced prefrontal surveillance during sweet taste processing, potentially reflecting a learned cognitive strategy to manage hedonic appeal.
“Hunger seems to turn up the volume on sweetness itself, making it more appealing whether it comes with calories or not,” the authors said. “We also saw that habitual non-nutritive sweetener users showed a stronger brain response in a region linked to self-control. It is as if their brains are working a little harder to keep their sweet intake in check.”
The study, published on May 20, 2026, with DOI 10.1093/fqsafe/fyag046, provides practical guidance for public health and the food industry. Because hunger enhances the appeal of any sweet taste, replacing sugar with NNS in snacks consumed between meals might satisfy cravings without adding calories. The heightened brain activity in habitual NNS users raises the possibility that these sweeteners could help reinforce cognitive control over food choices, though this remains to be tested.
The findings suggest that sweetness itself, not just its energy content, powerfully drives hunger-related eating behavior. Reformulating products to be less sweet overall, while ensuring they remain pleasurable, may be a more effective long-term strategy than simply swapping sugar for zero-calorie alternatives. The research was funded by the National Key Research and Development Program of China and the Collaborative Innovation Center of Food Safety and Quality Control in Jiangsu Province.
