answer:more like “no” – they tend not to.. but mostly because people get off of them, and for good reason. most diet pills (though i am not presuming to be all-inclusive) work by suppressing the appetite. meaning that by taking the pills, you don’t feel like eating, and thus you eat less, and thus you lose weight. this, along with the often numerous horrible side effects, are just some of the reasons why diet pills are so unhealthy. there are certainly plenty of diets out there that are much better for you. one interesting thing to note is that i recently had a friend who decided to be Vegan.. solely for the health benefits.. and has lost a TON of weight. she of course made sure that she was getting all the various vitamins and minerals and proteins that she needed.. but because she was eating no animal or dairy fat.. she lost a TON of weight.. and still is. and she feels WAY better in terms of health and energy levels. just a thought… :) good luck!