I think the weaknesses and human conditions should be more realistic.
Besides food, should have also the need for water, as the food that would also influenced by climate and temperature. Also it would be interesting to insert stamina, which decreases as the character run or fight, and its regeneration would be influenced by the amount of water and food.
The health regeneration should be slow as human normal regeneration, in which the speed would also be influenced by the amount of water and food. When using an item not health automatically recovers only adds to some extent the speed of regeneration. For example this character with a good amount of water and food will be the regeneration of 1x, if with little water and food regeneration will be 0.5X.
add more conditions as “Wounds” and “broken bones”, which would appear to depend on the damage taken. Would have an option window to look at the state of the character’s body, to verify the application of treatment or not. If the conditions are not treated, then appear after some time the state of “infection” in which to cease the natural regeneration of health, keep up a long time with this state would become “a critical infection” that inflicting continuous damage to the character until it kills him.
The more injuries and worse their health, more pain thus reducing the speed of the character. would be separated into Light, medium and high.
Treatment and Itens
As stated previously when using an item as “gauze” and “first aid”, the health not recover automatically, for example.
items would be:
Gauze: made of cloth, treating wounds and broken bones, prevents infection of the wound, halts bleeding.
First Aid: Same effect of gauze but more efficient.
antibiotics: Increases the regeneration of health in 0.5X, cure infections.
Alcohol: decreases pain for a while, cure infections.
Painkiller: Decreases pain for quite a while.