Dua to lose wieight: ya Shafee, ya Kaffee, ya Mu`afee, 100 times and for 40 days eat boiled vegetables and don’t use any oil, ghee or butter, with whatever spices is OK. In 40 days, if you do that, you will lose a lot of weight, at least 10 kilos.
source: eshaykh.com
Islamic Duas and Supplications 