Yeastbelly fungus lives inside you and can never be removed because it will eat you alive if it is not fed. You require 7 days rations per day. Note that it will take at least five hours to consume your meal. Your body will take Proficiency * 1 fire, 1 acid, 2 slashing and 4 piercing per hour. (Proficiency of 2 would be 16 damage per hour). Being locked in a jail cell overnight might be a death sentence. On the plus side, if you have eaten 10-14 days worth of rations in the last day, you are kept lean and energetic and gain the following benefits:

* +25' movement

* +2 Constitution (maximum 22)

* Haste for 4xProficiency rounds (once per short rest, no fatigue)

* 1hp per round regeneration for 10 rounds (once per short rest)
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See Bloodsmut, Milcollar, Greenskin