Food is relatively plentiful in Sprouted PD, which is helpful for exploring the larger levels, and for grinding. You should never be at serious risk of starving to death. In addition to reducing hunger, all Heroes heal a small amount when they eat. For most classes, this is 1-3 HP; Warriors are a special case. They heal a random amount, with the maximum being either 7 or the energy of the food/40, whichever is greater. When eating a Pasty, a Warrior could theoretically heal up to 17 points. Since you will most commonly be eating Chargrilled Meat, the typical amount will be 1-8 points.