I mean the easy answer is MK-677, but that will cause some side effects haha

If you have trouble eating, I always found a shake made from kefir, protein powder, banana & oats is a good way to start first thing in the morning to spike insulin and get the digestive system going

Sushi rice instead of regular rice is another good hack because it digests very quickly, making you hungry again sooner, and is more calorie dense