I do. I'll weigh less.
Exactly! We don't know the long term side effects of the diet BUT we do know that if you weigh less over the long term, it drastically improves the health of your heart and your pulmonary system. I know there are benefits to other body systems as well.
Life is a series (I mean that word) of decisions weighing risks. Given the choice of a speculated and unknown risk of long-term side effects which includes several well known and measurable benefits, I would choose the diet. We already know the measurable risks of being overweight.