Need help

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Hey everyone I am new to this and looking into loosing weight. I am working out once a day on Elliptical for 20-30 minutes and do situps. I tired A.C.E Diet pill and it did not give me jitters or anything but I stopped it after the first day bc I am scared Im going to gain all my weight back after I stop it bc the first day I lost 3-4 lbs. Scary of how much was gone I know. So im asking for some helpful dieting tips to get this weight off me. Or if anyone has taken ACE before and stopped what happen!