Will you lose weight if you eat less than 1000 calories?

Answer

definitely sounds like it, but that could be unhealthy

it is really important to be in shape; not necessarily 'buff' and muscular, but fit enough to do some pushups, curls, and lifting your own weight

find time for a bit of exercise during the day, and always drink water

but do not be hasty to see your performance! check your weight only once a week, because checking daily could be disappointing