Eating Pizza

Last night at work somebody gave us a pizza and we ate it all during our break time. One friend asked how can she lose weight if she always eating pizza. She really wants to loss weight but every time she tries to diet she can not stay with it. I told her that maybe she needs to try a weight loss supplement but she said she do not want take supplements because she heard they were no good. She walks every day for a few minutes hoping it will help but if there is food she can not help herself she will eat it all.