Every major action—scavenging, training, fighting, and crafting—consumes energy. Sleep or consume food/caffeinated items to replenish it.
Going to bed with zero food intake drastically reduces your energy recovery the following day and permanently lowers maximum health until treated. a zombies life walkthrough repack
Scavenge kitchens early. Eat perishable foods first and save canned goods for emergencies. Every major action—scavenging