Why muscle matters
Starving the body for weight loss leads to muscle loss and a slower metabolism. What that means is that you plateau quicker and potentially never reach your goal weight. Worse still, when you go off the starvation diet you gain weight back easier and faster. Every time you repeat this cycle your body fat percentage increases, your muscle mass goes down and metabolism gets slower.
Here is what could happen if you crash diet and lose 50 pounds. 25 pounds lost is fat and 25 lost is muscle. When you gain the weight back, you don’t get the muscle back. You gain 50 pounds of fat.