I think blood should definitely SLOWLY regen as well, the current system is a bit wonky in my opinion. Basically, instead of eating food giving you an immediate blood boost, your blood should slowly regen as long as BOTH your hunger and thirst meters are somewhere in the 75-90% range, and the lower you are on blood the quicker these meters will deplete (even while stationary). Blood bags will still give you a bigger boost quicker than this method, but the gain should still be gradual to simulate the time it takes for the bag to be completely depleted. The rate of regen as people have mentioned already should be very slow, but still high enough that it can be a viable longterm strategy VS the quicker, but more risky method of trusting someone to give you a transfusion. This means that when you are low on blood you will still have to continually scrounge for food and water if you want to get your blood back that way, so this method won't really encourage idlers or campers (unless you have a shit-ton of food and water packed away somewhere, but I don't think the majority of players have this luxury). Also, you won't regenerate your blood while being offline either. Also, it would be interesting if certain foods and drinks kept your meters higher for longer, for example eating freshly cooked meats would make your hunger deplete slower for a limited time compared to canned food (thus increasing the length of time your blood can regen) while the same would go for pure water vs. cans of cola.