Well, some food item do give small amounts of blood regen, like honey, and a few other very nutritious foods. The red bar will be on the icon in your inventory, if that item increases blood regen.
Blood increases naturally over time, but is very very slow. Not taking small damage will help it fill up quicker.
You can eat heal herbs for a smaller boost without penalize your OSR score. Only drinking heal potions giving a significantly larger boost negatively affects OSR.
The Herbal Garden is a huge milestone in the game. If ya build 2 of them asap, you will be growing heal herbs daily. Try to eat them, vs drinking heal potions if your wanting a better OSR score. Unlocked through farming and building farming equipment.
When you sleep...some things affect blood regen...like if there is a shelter, and/or bed near. Your low blood can be regen by sleeping longer and more often if you have those object near...but at the cost of losing valuable season "time". Winter is no joke. (see Diary Operations about objects)
Keep in mind, when sleeping, you wake up hungy and thirsty...so it requires more food and water to sleep a lot.
Just as important, by sleeping into the future, faster, other more difficult things are triggered in game...like "Hostile Animal Events" increase in frequency...but on the flip side, at level ups, you gain in abilities like speed and carry capacity and potentially unlock advanced buildings early.
p.s. The more advanced the object you sleep near, the more blood it regen. example; a primitive bed vs a hammock. A bed can also speed up healing wounds and fractures, "use" it when injured...also "tiered" like other objects. edited 3×, last 23.10.20 03:30:07 pm
Stranded II 
TheSurvivalist:Christmas Update 12-24-19
Offline
I even survived the wolf attack because I built near water 
Haraldstranded
