Strongly depends on how much they weight in the end and what is the price of weight loss. Loosing too much weight makes you less healthy, sometimes very damagingly so.
It also depends on what is the price of that weight loss. Quite a few diets make you loose weight and simultaneously make you much less healthy or less fit - because your body is missing nutricients it actually needs.
It also depends on what is the price of that weight loss. Quite a few diets make you loose weight and simultaneously make you much less healthy or less fit - because your body is missing nutricients it actually needs.