High-Intensity Exercise May Be More Effective for Appetite Suppression

A new study suggests that high-intensity exercise is more effective at suppressing hunger than moderate exercise, particularly in females. The research, published in the Journal of the Endocrine Society, looked at the impact of exercise intensity on ghrelin levels and appetite in both men and women.

Ghrelin: The Hunger Hormone

Ghrelin, often referred to as the “hunger hormone,” is produced primarily in the stomach and plays a significant role in regulating appetite. It acts on the hypothalamus in the brain, signaling the body to increase food intake. The hormone exists in two forms: acylated ghrelin (AG) and deacylated ghrelin (DAG). Each form exerts different effects on appetite.

Study Findings

The study, which involved eight male and six female participants, found that high-intensity exercise led to a greater suppression of ghrelin levels, particularly the AG form, compared to moderate-intensity exercise. Participants also reported feeling less hungry after high-intensity workouts.

“We found that high intensity exercise suppressed ghrelin levels more than moderate intensity exercise. In addition, we found that individuals felt ‘less hungry’ after high intensity exercise compared to moderate intensity exercise,” explained Kara Anderson, Ph.D., lead author of the study and researchers at the University of Virginia.

Kara Anderson, Ph.D., lead author of the University of Virginia and the University of Virginia Health System in Charlottesville, Va.

The study also noted that females had higher baseline levels of total ghrelin compared to males. This suggests potential differences in how men and women respond to exercise and its impact on hunger regulation.

Exercise Intensity Matters

The researchers emphasize that exercise above the lactate threshold, a measure of exercise intensity, appears to be necessary to elicit a significant reduction in ghrelin and subsequent appetite suppression

“Exercise should be thought of as a ‘drug,’ where the ‘dose’ should be customized based on an individual’s personal goals,” Anderson said. “Our research suggests that high-intensity exercise may be important for appetite suppression, which can be particularly useful as part of a weight loss program.”

Future Research

While this study provides valuable insights, further research is needed to comprehensively understand the sex-specific effects of exercise intensity on ghrelin levels and appetite regulation. Investigating the long-term impacts of different exercise intensities on weight management and overall health is also crucial.

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