Cholecystokinin is a gut hormone released after having food which helps digestion and reduces your appetite.
Protein can also help lower the hunger hormone called ghrelin.
Feeling full for longer can help you take control of your calorie intake and consequently help you lose belly fat, the Harvard Health T.H. Chan School of Public Health reports.
Protein can also boost your metabolism, which can in return result in visceral fat loss, the National Library of Medicine adds.