The reintroduction phase occurs after at least six months of normal digestion on the full GAPS diet. It involves gradually reintroducing previously eliminated foods, one at a time and in small amounts. The goal is to identify any foods that still cause digestive issues or other adverse reactions. If a food is well-tolerated over 2-3 days, the portion size can be gradually increased. While the GAPS method doesn’t specify a strict order, it suggests starting with new potatoes and fermented, gluten-free grains. Even after this phase, the recommendation is to continue avoiding highly processed and refined, high-sugar foods, maintaining the whole-foods principles of the diet. This phase can be a long process, spanning several months.