Answer:
Yes and no
Explanation:
Many people believe that having a calorie deficit will cause the body to break down fat, however the first thing the body breaks down is muscle because it is much more rich in the necessary nutrients. That is why most people with anorexia have large amounts of protein in their urine. However depending on the size of the calorie deficit, you can build muscle by have lower calorie intake with high nutrient intake, while working out, it is possible to build muscle.
