Drinking water makes overweight people burn more calories at rest than it does for lean people.

Even though the study says water makes your body burn more calories, it didn’t actually measure whether that happened — so that part of the claim is just guessing.

During weight loss, the body's reduction in energy expenditure in the early phase is related to lower carbohydrate stores and less water inside cells, caused by decreasing insulin and increasing glucagon; in the later phase, it is related to the breakdown of fat and decreased metabolic activity in specific organs.