How many calories should be eaten to lose weight?

it depends on how much you eat and how many times you workout. if you eat and work out ALOT, then you got no problem because you're gaining calories but you're also losing them.

Answer

You need at least enough to support your daily activities--around 2000 calories a day. If you go below that, your body thinks you are in starvation mode, and will consume muscle rather than fat.