How many pounds will I lose if I don't eat lunch for three or more weeks?

I went through the same way in trying to starve myself in which I did lose weight. I wouldn't eat breakfast and lunch. I used to use a 3 and went down to a 1..But after the depression I went through I gained weight now im a 4. I don't think starving yourself would be the right path for you to choose but its your choice. Instead of choosing that option think of doing Yoga or go to a gym and do simple exercises. Another option you have is to run early in the mornings or in the evenings and that would make it even better. Also to give you more feedback do not listen to your father he is just doing this to hurt you, just think positive and do what is best. Another thing your not trying to look good for him so he should not gve an opinion towards your body. So cheer up.