in order to lose weight effectively, you need to burn calories or restrict your diet. every body is different and responds differently. my diet for losing weight when im lifting is one cup of rice or oatmeal and a portion of chicken 6 times a day. when i get bored of chicken i use protein or egg whites.
watch your calories and try to stick under 1200 a day.
the main way to lose is cardio. bike for 30 min, or treadmill. increase intensity every 3 minutes of rthat 30 and you will be sweating at the end. it works.