It is a opportunity to emphasize with those in poverty. It is a way to truly appreciate every meal - saying grace before a meal take on a real significance. And it is an opportunity to be truly thoughtful about the food you are putting into your body - particularly as the fasts are often "no meat" or something else specific.
She is also not surprisingly a very good cook and cooks most things from scratch. If she were to start a food company, I'm sure she'd use the same values.