During a caloric deficit, which macronutrient can help inhibit muscle loss?

Protein plays a critical role in preserving muscle mass during a caloric deficit. When the body is in a state of calorie restriction, it can start to break down muscle tissue for energy. However, consuming adequate amounts of protein helps stimulate muscle protein synthesis and reduces the likelihood of muscle breakdown. Protein provides the essential amino acids necessary for repair and growth of muscle tissues, which is particularly important when calories are limited.

In addition to supporting muscle maintenance, protein also has a higher thermic effect of food compared to carbohydrates or fat, meaning it requires more energy to digest and metabolize. This can provide a slight boost to overall metabolism while on a caloric deficit. In contrast, other macronutrients like carbohydrates and fats serve different primary functions and do not have the same protective effect against muscle loss when caloric intake is reduced.