Surely if one loses a lot of weight by doing a high dose of exercise, one would not lose but rather gain a longevity benefit. (nutritionfacts.org)
When people lose a lot of weight without any resistance exercise, they also lose quite a bit of lean muscle mass. (coachcalorie.com)
The popularity of these diets for sure comes out from the dramatic results they bring, whereby upon small time frame you can lose a lot of weight without additional exercising. (fitnessandpower.com)