They don't eat. Really. My mil is not that wealthy but she eats like one hard boiled egg for breakfast. A can of tuna and some crackers for lunch and a tiny chicken breast and some broccoli for dinner. She suppressed her appetite so much. She's a little obsessed with it and enjoys being hungry. She also works out 4-6 times a week. My poor Fil is on the same diet. They never have leftovers or red meat or bowls of pasta. Unless it's our house and then they demolish 3 servings of everything including ice cream

.