One of the properties of collagen is its ability to build lean muscle mass. In conjunction with exercise and a healthy diet, it can actually help reduce weight. A study showed that 20g of gelatin (which is actually hydrolyzed collagen) produced an increased feeling of fullness after a meal by stimulating the release of satiating hormones (23). They concluded that collagen could be used for adherence to diet control for obese people and help diabetic patients. To put it simply, collagen supplements can help with weight loss by simply building lean muscle mass and reducing the need to snack constantly.