Hi, thanks for the query to H.C.M. Forum.
Over feeding ( eating ) is the root cause of many diseases.
Same thing is in your case.
When you eats fatty food the next day you feel bubbling and gas formation according to you ( Hyper acidity and gastritis
is the main reason of bubbling and gas)
Fat is the richest source of energy ( calories) i.e 100 grams of fat produces 900 -1000 calories and those who live a sedentary ( chair work i.e. mind game (brain work) life require only 1400 -1500 calories.
When you eats fatty food than extra calories will produces in your body and that extra calories will from a pot belly ( tummy abdomen).
Fatty food produces ketones , cause of peculiar smell which you are feeling.
So control your diet.
Have a healthy diet. Good luck Dr. HET