First off, those things aren't safe. I mean, if someone offered you speed to lose weight, would you take it? It's honestly about the same thing. Watching what you eat and exercising is the best thing you can do for your body... proper nutrition is key. And if you are sleeping 15 hours a day and still feel tired and depressed maybe you should only sleep the recommended amount of 8 hours a day and get yourself out into some fresh air and sunlight. And if you are more active and treating your body properly then your chances of losing weight increase.

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