Nothing is more immersion breaking than being in the middle of an intense fight and having a message pop up saying "you are hungry" then having to open the menu and eat just to bring your stats back up to normal.
Ahh here we have one of the major thinking problems on this whole issue (not mocking you but pointing out the main issue most people overlook).
Most people think it would work similar like diseases on the games so far, you get it and WHAM, your stats are down.
NO this is NOT the way it should work, it would not be instant but PROGRESSIVE. When you get hungry you don't INSTANTLY go "strength -10, health -50" or so, it would be "you're hungry, maybe find something to eat in the next FEW HOURS", then when you don't eat in that time you get a sliiiiight decrease in your regeneration (assuming that is implemented) which slowly gets worse over the next few hours. You only start losing "stats" after you haven't eaten in maybe 2 in game days and even then it's not that you suddenly drop dead. You could hover out without eating for quite some time but in that time your regeneration goes down
gradually, some of your stats go down
gradually and when you're at the worst point, completely starved, your health could go down
gradually.
Now you may say "then what would be the necessity", long term effects.
If your character is starved out most of the time his regeneration takes longer till it reaches peak condition again and stats don't come back instantly they take a while to come back to full power. That way eating something in regular intervals has a REWARDING effect (more constant and faster regeneration) while only eating now and then only means that effect is weaker. Only not eating at all would be harmful.
It's ALL really about things being
gradually and not
instant.
Diseases should go that way too, not WHAM, but you get it, it gets worse and then takes time to heal.
Poisons too, while they can work a lot faster an idea was that the more damage it did the longer it takes to fully heal that damage.
PS: Oh yea and on the "but I don't want to carry food round" issue, open your Oblivion file, look at the stuff in your inventory and count how many of the potion ingredients you carry around are edible AND if you could maybe leave that extra axe behind to make room for a sandwich.