One thing that may help you with satiation (not being hungry) is the amount of space/volume available in your stomach.
If your stomach is full, your body stops telling you that you are hungry, even if you were about to die from nutrient deficiency.
How to use this: drink a glass of water anytime you are about to eat (or drink soda). Then you can eat (or drink) like normal, except you will have the water's volume increasing your satiation. This will generally have you eating less.
DO NOT OVER DO IT ON THE WATER! HYDROCEPHALUS IS A THING AND YOU CAN DIE!
Hopefully that's somewhat helpful. Good luck and be safe.
Edit: Just to reemphasize, hydrocephalus literally means watery brain in Latin.
Game show contestants have died because they tried to drink excessive amounts of water in a short timeframe.