“High-intensity cardio makes you hungrier.”
Hard cardio does not consistently increase hunger; one 12-week training trial found hunger rose at both high and moderate intensity, with no difference between them.
You can choose how hard to push your cardio by what you enjoy and how much time you have, without worrying about your appetite. If you notice you eat more after workouts, that pattern is real in some people at any intensity, and planning your post-workout meal ahead works better than skipping hard sessions. For fat loss, eating in a modest calorie deficit and adding lifting matter more than how hard your cardio is; see our card "Lifting weights plus cardio is better than cardio alone for losing fat."
Keep the cardio intensity you enjoy. For a week or two, notice what you eat after workouts, so you know whether you are one of the people who eats more and can plan around it.
A meta-analysis of 28 single-session comparisons, a 12-week randomized trial and a meta-analysis of 48 training studies all tested intensity and found that high-intensity exercise brings no more hunger or eating than moderate exercise, and that any rise in hunger with training is small. Many of the training studies are small and rely on self-reported eating, which is why confidence is Moderate rather than Strong.
Hard cardio does not consistently increase hunger; one 12-week training trial found hunger rose at both high and moderate intensity, with no difference between them. Across 28 single-session comparisons, people ate the same after high-intensity exercise as after moderate exercise, and none found they ate more; across 48 training studies, hunger before meals rose only slightly, whatever the intensity. In the trials, hard intervals and moderate cardio took off the same amount of fat, and intervals did it in about 40 percent less time.
A meta-analysis of 17 studies found no difference in how much people ate after high-intensity intervals compared with moderate steady cardio (22 comparisons) or after sprint intervals (6 comparisons). Five of the 28 comparisons found people ate less after the harder session. In the 12-week randomized trial of 46 obese adults doing moderate cardio, intervals, or short intervals with matched calories, fullness, hunger hormones and food reward did not change in any group. A meta-analysis of 48 training studies in adults with overweight found intake about 100 calories a day higher than in non-exercisers in the better-quality studies, and intensity did not change that. In 13 trials comparing intervals with moderate cardio, fat came off in the running trials, at either intensity, but not in the cycling trials.
In a 12-week study of 35 overweight adults doing supervised moderate cardio five days a week, the group lost about 8 pounds on average, as predicted, but results ranged from a loss of about 32 pounds to a gain of about 4. About half, called compensators, ate about 268 more calories a day, reported more hunger, and lost about 3 pounds instead of about 14. This study used moderate cardio, so it says nothing about intensity.
- Rossi PAQ, Panissa VLG, Silveira R, et al. Post-exercise energy intake: do the intensity and mode of exercise matter? A systematic review and meta-analysis comparing high-intensity interval with moderate-intensity continuous protocols. Eur J Clin Nutr. 2022;76(7):929-942. DOI: 10.1038/s41430-021-01026-w. PMID: 34675403
- Martins C, Aschehoug I, Ludviksen M, et al. High-intensity interval training, appetite, and reward value of food in the obese. Med Sci Sports Exerc. 2017;49(9):1851-1858. DOI: 10.1249/MSS.0000000000001296. PMID: 28398946
- Beaulieu K, Blundell JE, van Baak MA, et al. Effect of exercise training interventions on energy intake and appetite control in adults with overweight or obesity: a systematic review and meta-analysis. Obes Rev. 2021;22(Suppl 4):e13251. DOI: 10.1111/obr.13251. PMID: 33949089
- King NA, Hopkins M, Caudwell P, Stubbs RJ, Blundell JE. Individual variability following 12 weeks of supervised exercise: identification and characterization of compensation for exercise-induced weight loss. Int J Obes. 2008;32(1):177-184. DOI: 10.1038/sj.ijo.0803712. PMID: 17848941
- Wewege M, van den Berg R, Ward RE, Keech A. The effects of high-intensity interval training vs. moderate-intensity continuous training on body composition in overweight and obese adults: a systematic review and meta-analysis. Obes Rev. 2017;18(6):635-646. DOI: 10.1111/obr.12532. PMID: 28401638