Strictly Speaking, Calories, But There is More . . .
From a strictly biological perspective, the “calories in versus calories out” model matters for weight loss. You will only lose weight if you consume fewer calories than you burn, regardless of the types of food you eat. However, this model fails to take nutrient density into account, which is highly relevant to your health. Moreover, different foods can impact your hormones, metabolism, hunger, and feelings of fullness differently, in turn influencing your calorie intake. Practically speaking, some foods can make it easier for you to remain at a healthy weight, all while optimizing your overall health. Focusing solely on calories may cause you to miss the big picture.