Recently a friend from my sisterhood circulated an email, saying she was nauseated and had no appetite. Because most of what she ate made her feel worse, she was hardly eating at all. She asked what foods would go down easily, so she could keep up her strength. When you ask three dozen Jewish women for advice about food, you know you’re reaching the source of wisdom. But you will get enough opinions to fill a book: Stick to plain pasta or rice. Boiled potatoes are even better. Avoid fried foods and spices. Have toast with no butter. Stay away...