Dr. Viola explains that you must burn more calories than you take in to lose weight (to lose one pound, you’ll need to burn about 3,500 calories, she says) and that your body expends more energy when you walk, thus burning more calories. Dr. Viola explains that walking after dinner particularly helps regulate circadian rhythms; it enhances the body’s natural sleep-wake cycle, making it easier to fall asleep and enjoy deeper, restorative rest. Dr. Viola says that walking after a meal may help your body manage the rise of blood triglycerides, (a type of fat found in your blood and can cause a stroke, heart attack, or heart disease if levels are too high), which can occurs after eating.