Papaya originated in Mexico, Central and northern South, but now is cultivated in most countries with tropical climate. Ripe papayas are rich in vitamins and also aid digestion. Eating them is especially helpful for weak or old people who complain of upset stomach when they eat meat, chicken, or eggs. Papaya makes these foods easier to digest. If you like peach or apricot pie, try this easy papaya pie for a touch of the tropics.. Using a pre-made graham cracker pie crust makes this a quick and easy dessert, but do allow for cooling time before serving.