There is no amitabha in the south! Read as long as you want, and don't eat after reading.

In fact, it has nothing to do with reducing appetite. When chanting the Buddha's number, remind yourself to have more appetite. Restrain yourself, just want to hold your appetite. Don't eat after noon, but drink water when you are hungry. When you are full, you are not hungry. After about 10 days, you can stop eating at night.