What Whole30 allows and removes for 30 days
Whole30 is a 30-day elimination program. It permits meat, seafood, eggs, vegetables, fruit, nuts, seeds, and natural fats, and removes grains, legumes, dairy, added sugar (including most natural sweeteners), and alcohol. It is intended as a short reset and self-experiment, not a permanent way of eating, and the program itself frames it that way.
What an elimination-and-reintroduction window can and cannot tell you
The structure resembles an elimination diet: remove suspected triggers, then reintroduce them one at a time and watch for symptoms. This can surface individual food intolerances, but it is not a validated diagnostic test for food allergy or celiac disease, and removing whole food groups (legumes, whole grains) drops fiber and some nutrients during the month.
This is general educational information, not medical advice. Suspected food allergy, celiac disease, or persistent gut symptoms should be evaluated by a qualified clinician rather than self-diagnosed from an elimination month.