The vast majority of people who lose weight by calorie restriction gain it back, so I wouldn't call it highly effective. Short term yes, but long term, definitely not.
The vast majority of people who lose weight by calorie restriction gain it back, so I wouldn't call it highly effective. Short term yes, but long term, definitely not.
Why do they gain the weight back though? I'd hazard a guess they stop the calorie restriction and go back to their old habits.
Short term "diets" are nonsense. The solution is permanent lifestyle changes.