Minecraft wiki entry for Poisonous_Potato, associated text: To eat a poisonous potato, press and hold use while it is selected in the hotbar. Eating one restores 2 () hunger and 1.2 hunger saturation and has a 60% chance of applying 5 seconds of Poison II, draining 4 points of health. Interestingly, a poisonous potato actually restores double the hunger and saturation than a normal, unpoisoned potato. (A normal potato gives 1 () hunger and 0.6 saturation points).