Weight gain is the intake of more calories than your body burns in a day. The calorie surplus supports muscle growth, increases bone density, and adds fat to your frame.

Run a calorie surplus for long enough and you'll gain weight. That said, it’s probably not a good idea to rely solely on increased protein intake if you're looking to gain weight.

Below, you’ll find a definitive list of high-protein, low-calorie foods to add to your diet, as well as the benefits that eating more of these foods can bring, and ideas on how to cook with them.

There are certain lifestyle habits that are clearly linked to weight gain, like not being active in your daily life and eating a diet filled with ultra-processed foods.But new research suggests ...