I partly agree.
It's VERY easy to farm Vitamin A (Pepper and so on), B (Meat), C (Berries) and D (Fish).
The System works like this:
Stomach full > eating > overeating malus
Taking in too much vitamins > vitamin poisoning > hp gets reduced and you might die
Overeating, poisoning effects and dead chance can be reduced after skilling
Too less vitamins > you get ill (if you bark like a dog, check your vitamins!) > depleted vitamins > dead
Stamina > working, fighting and running reduces stamina > filling up stamina reduces stomach content
Vitamins reduces by time > stomach content should do too, but it doesn't seem to work properly > deflate never worked for me - only automatic over time
If you don't have to fight and didn't skill vitamin reducement, it's easy to get the ballance. Why i agree that it needs changes is...
After skilling to reduce vitamin loss it gets harder to get the ballance, there are points when you have to eat, but you will run into side effects.