I had an AP like that once. One night I made chicken and dumplings and she ate ALL the dumplings. That's like eating an entire loaf of bread. Then we'd take her to restaurants and she'd order an appetizer, a large meal, a smoothie to drink, and dessert. About 6 months in, she noticed she had gained about 20 lbs and complained that the American food had made her fat. No, YOU made you fat.

You have 2 options:

1. Give out food rations.
2. Cook more food.