While the skill's name 'Survival' would denote it simply being a practiced form of subsistence, the survival skill also encompasses the (relatively) finer points of cuisine in post-apocalyptic America.
Heals 4 HP/second for 15 seconds, -60 Dehydration, -150 Starvation at 50 skill.Heals 2 HP/second for 15 seconds, -30 Dehydration, -75 Starvation at 0 skill.Radiation effect on foods is not affected. stats or increases to the character's Dehydration, Starvation and Sleep while in Hardcore mode. However, this does include negative effects such as penalties to S.P.E.C.I.A.L. Higher levels of the Survival skill also increase the effectiveness of food items, including stat changes, whether they are made from Survival recipes or not, up to a tripling effect at a skill level of 100. The Survival skill allows the player character to create more powerful poisons, chems, and consumable food and drink items at campfires scattered around the wasteland as the skill is increased.