don't eat the food, sore it, and as for the hanger, just use coins up to 50 yen to get seeds, and eat them, that will keep you alive for a while, make sure you are shiny every time. but I think I know what your actual problem is, you leave the begging screen to early and you don't get enough money. stay there until you get the first message the police might notice you, or whatever it says, and go to the vending machine, do that every time, never leave early, and use the infinite money bug only with the 500 yen coin, even the 100 yen coin is not worth it for the bug, only use the 500 yen coin for the bug, also make sure your hunger doesn't stay at 0 for too long, or you will become worse, and only eat healthy foods or seeds for hunger. ignore the water meter, it's not worth drinking water. Keep in mind that eating other types of food then your transformation will also make your transformation go down. so only eat healthy foods until you get a lot of other categories.
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I did ALL of that stuff. Stayed on the begging screen till it gives the cop warning. Only used the 500 yen coin for the glitch. Found a spreadsheet in the comments listing what food does what transformation. Spent like 15 minutes buying and eating stuff for a specific transformation. STILL didn't get anything to happen. The game has the problem, not me.
The game is very tedious and specific : If you want to transform. At first just eat any food to survive. however, hoard the food that has the transformation you want, you need A LOT at least by minimum 8 pages of the same food if possible. 10 Plus is better.
Once you're ready, then start to eat and ONLY eat the food that gets you the transformation that you want.