Does calcium help you lose weight?

Not in a way that matters. A 2024 Cochrane review of 18 trials found little to no difference in body weight in people with overweight or obesity (0.15 kg less, low certainty).^[1] It found that calcium probably gives small drops in body mass index (0.18 kg/m²) and waist size (0.51 cm).^[1]

A 2016 review of 33 studies with 4,733 people also found no difference overall (0.01 kg). It found small losses in some subgroups, such as children and people with a normal body mass index.^[2] Another review of 41 trials found no effect of supplements on weight or body fat.^[3]