Lead Belly

Lead Belly is a perk in Fallout 3, Fallout: New Vegas and Fallout 4.

Effects
With the Lead Belly perk, 50% less radiation is taken every time you drink from an irradiated water source. In Fallout: New Vegas, this benefit extends to all irradiated food and drink.

Fallout 4
Taking this perk on early may help out a lot as most manufactured food carries a lot of rads, and RadAway is scarce in the beginning. Conversely, this perk has little value for high-level characters because foods provide only a fixed amount of hitpoints (whereas Stimpaks restore a percentage). If you have two ranks of Solar Powered this perk is worth even less.

Although, with the introduction of the new survival mode where the player has to consume food and water all the time in order to survive, this perk still might be useful.

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