However, your body has evolved to protect its energy stores. During weight loss, two key biological shifts occur:
Muscle mass is more metabolically active than fat. People with more muscle burn more calories, even while resting. Metabolism and Weight Loss: What You Need to Know
Metabolism naturally slows with age due to muscle loss. Men typically have higher metabolic rates because they generally possess more lean muscle mass than women. However, your body has evolved to protect its energy stores