When my wife ovulates, she eats a LOT. why?

It's weird! She can eat like 3 days of breakfast stuff in a day. Usually 3 eggs, 3 instant carnation breakfast shakes, 3 fruit roll ups, 4 peices of beef jerky, a sandwich, a bowl of stew, and like 12 oz of fruit and 5 caffeine free diet sodas. whats up with that? she barely eats anything most days