11 Differences Between Swimming and Gym Workouts That Impact Weight Loss

2. Appetite response and water temperature: the appetite effect

One of the most important differences for weight loss is appetite after exercise. Multiple studies summarized by NutritionFacts.org show that exercising in cool water — roughly around 70°F — can greatly increase the amount people eat after a workout. In one study, participants burned around 500 calories swimming in cool water but then ate nearly 900 calories at the next meal, erasing the energy deficit many would have expected (NutritionFacts.org). This appetite spike helps explain why some swim programs don’t produce expected weight loss.