I been using it for 5 days now . You have to stay active or your heart will pound. I have more energy now and I don\'t want to eat much not even my favorite chocolate chip cookies it makes my stomach hurt.My downside is I get a head ache. I haven\'t weigh myself yet but I am sure I will lose weight due to the fact I don\'t want to eat.Hey if it works for Brittany Spears it will work for you , I guess it\'s if you want to deal with the consequences or not