Not sure what an invasive diet is, but once a child is obese from lack of prevention, the whole family needs a dietary change, unless the kid has been tortured with food. Prevention is always the best medicine, but when that fails, you need treatment (which is dietary modification=diet)!
when i say invasive diet, i mean one that would normally be LESS than the healthy caloric intake of a child/person that is not obese.
i am not against invasive diets, but i think that invasive diets show a failure on someone's part to improve the quality of the nutrition.. because obesity really isnt an overnight thing. intervention is possible, and necessary, which is why i support healthy meals in schools.