Dr. Maya Rozman Explains Why Running Often Suppresses Immediate Hunger Compared to Walking
It is commonly believed that running increases hunger more than walking due to higher energy expenditure. However, research shows that immediately after running, many people actually feel less hungry than after walking, with appetite returning or increasing only later. This temporary appetite suppression after running is linked to several physiological factors.
During running, blood flow is redirected from the digestive system to active muscles and skin, slowing digestion and reducing immediate hunger. Additionally, the rise in body temperature during running, similar to being in hot weather, can temporarily diminish appetite to prevent further fluid loss through sweating. This effect fades as the body cools down.
Studies refer to this phenomenon as "exercise-induced appetite suppression," which is more pronounced after moderate to high-intensity aerobic exercise like running. Hormonal changes also play a role, including a temporary drop in the hunger-stimulating hormone ghrelin and increases in satiety hormones such as PYY and GLP-1. The sympathetic nervous system activation during exercise prioritizes oxygen delivery to muscles over digestion, further reducing hunger right after intense running.
The duration and intensity of exercise, individual fitness, prior meals, weather conditions, and personal habits all influence the degree of appetite suppression. While running generally burns more energy than walking over the same time, the immediate hunger response varies. Over several hours, as body temperature normalizes and blood flow returns to the digestive system, hunger often rebounds. Because running expends more energy, some people experience greater hunger later to replenish calories, though this is not universal.
Comparisons between running and walking depend on factors like duration, intensity, and distance. For example, walking the same distance as running takes longer and may reduce the energy expenditure gap. Light walking usually does not suppress appetite as much as intense running. Moreover, not all post-exercise eating urges reflect true physiological hunger; habits, perceived energy expenditure, and timing of exercise relative to usual meal times also affect appetite.
In summary, the myth that running always causes greater hunger than walking is inaccurate. Immediately after intense running, appetite may be suppressed temporarily, with hunger returning or increasing later depending on multiple factors. Individual responses vary widely, and the timing and nature of the activity must be considered when assessing post-exercise hunger.
