Set point theory
Clinical reviewer: Jacob Moore, MD · Last checked September 24, 2026
What is set point theory?
Set point theory is the idea that body weight is defended within a stable range by the body's own feedback systems. It contrasts with a competing settling point model, in which feedback between body stores and expenditure is passive rather than actively targeted. Evidence for a strict set point in humans remains unsettled.
How does the set point model work?
Set point theory holds that body weight is maintained within a stable range, called a set point, despite day-to-day variability in how much a person eats and how much energy they use [1]. Under this model, researchers describe the body as more efficient at defending against weight loss during calorie restriction than at defending against weight gain from overfeeding [1]. A competing settling point model instead proposes only passive feedback between the size of the body's energy stores and expenditure, without an active target [2].
Does evidence support a body weight set point?
Reviewers note the set point model does not fully explain why obesity has become so much more common over time [2]. A 2018 review found no consensus framework for body weight homeostasis, and observational studies in large human populations have not consistently shown a biological control of body weight [3]. Weight regain after treatment stops is well documented, though it does not settle the question: in the STEP 1 trial extension, participants who stopped semaglutide regained two-thirds of their prior weight loss [4].
Related terms
Sources
- Set-point theory and obesity.
- Set points, settling points and some alternative models, theoretical options to understand how genes and environments combine to regulate body adiposity.
- Recent advances in understanding body weight homeostasis in humans.
- Wilding JPH et al. Weight Regain and Cardiometabolic Effects after Withdrawal of Semaglutide, The STEP 1 Trial Extension. Diabetes Obes Metab, 2022.
This entry is for education and is not medical advice. Talk with a licensed clinician about your own situation before starting, stopping, or changing any treatment.
