Bypassing minimum 1200 calorie intake limit per day with healthy food?

Hello, here's a question that my sister was wondering since today. My sister (and other humans) have to eat at least 1200 calories a day to keep the body functioning correctly. I monopolized her diet due to her inability to control her under/overeating, and I'm wondering: do things such as fruits and veggies with very low calories (or negative calories) make up for the 1200 calorie minimum? Or does she still need to consume the minimum? Also, if fruits and veggies will not bypass and make up for the 1200 calories (she wants to avoid fatty food) will things such as eggs, salmon, and other protein rich foods make it up?