Celiac disease sufferer here! I am visiting family in the area and we went to Galpao Gaucho for lunch. Most of the menu including all but three meats are naturally gluten free. They have a menu marked with the nine items to avoid to keep gluten free. It was also marked for dairy, shellfish, and soy allergies (photo included).
The staff was very kind and helpful and the salad bar selections were delicious. There are separate tongs for every item to reduce the risk of cross-contamination.
The Brazilian cheese bread that first arrives at the table is also gluten free! I may have had way too many of them…