I used to eat only 300 calories a day and work out after every little thing I ate.
Know this: not eating enough fucks your metabolism really badly. This means that absolutely WHATEVER you eat will be stored and held on to by your body and it will turn to fat. Even if you work out. Eat a good amount of healthy food, take vitamins, and be patient. That's the hardest part is being patient. If you ever need help or anything, you can feel free to message me :]
Be healthy.