Jamie has a lot of food, he can eat whenever he wants, and whatever he has available. He can always get more food from his servants and would almost never grow hungry.
Pan shot - Fridge full of food
Far shot - Shanghai being invaded
Jamie and his family were privileged in their estate, and when they went into the city, they had their own safe place, their Rolls Royce. Once the Japanese bombed them, they had no home, no Rolls Royce, no mama or papa and no safety.
Jamie has become Jim, and became an American. He starts stealing for his own life, helping his American friends and helping at the Hospital to occupy his brain. He tries his best to help those around him and escape in the process; all while respecting the Japanese pilots of his dreams.