Diet versus exercise, what contributes more to pure weight loss?

Find out your blood type and it'll be easier to see what you have to focus on eating more of. You also have to consider how much weight you want to lose and how long it will take. It's real simple, you burn more than what goes in estimations. If you want to lose 50 lbs in 3 months, you have to work out enough to burn the calories you eat a long with the additional to stay on that schedule

I'm type O.
Right now I'm trying to limit myself to 1500~2000 calories a day and I burn approximately 2200~2500 by existing -- at least that's what the calculator tells me. Sometimes I go over, sometimes I don't even get past 1000 calories because I feel sick to my stomach after one bite. I end up being unable to eat for a while, if not the whole day.