The Whole30 website reads as follows on the reintroduction phase:
Days 1–30: Original Whole30 elimination
Day 31 (optional): Reintroduce added sugar all by itself
Days 32–33: Back to Whole30 elimination
Day 34: Reintroduce legumes all by itself
Days 35–36: Back to Whole30 elimination
Day 37: Reintroduce non-gluten grains all by themselves
Days 38–39: Back to Whole30 elimination
Day 40: Reintroduce dairy all by itself
Days 41–42: Back to Whole30 elimination
Day 43: Reintroduce gluten-grains all by themselves
Day 44–45: Back to Whole30 elimination
Day 46 (optional): Reintroduce alcohol all by itself
Day 47–48: Back to Whole30 elimination
You can break this schedule down ever further if you like: splitting out artificial sweeteners from more natural sugars, reintroducing corn separately from other non-gluten grains, or reintroducing gluten-free alcohol separately from gluten-containing beer. The more carefully and patiently you reintroduce, the more you’ll learn from your experience.
Just remember to return to the Whole30 elimination phase for 2-3 days between each Reintroduction food group. And if at any point you feel like you haven’t adequately recovered from the effects of the reintroduced foods, give yourself a few more days of Whole30 elimination before you bring in another.
