The following is just from my experience. In order for your gut not to be constipated, you must feed your gut with nutritious food, such as varied kinds of fruits, cooked vegetables, and grains. Do not overdo it, because that course will magnify your constipation and cause uncomfortable bloating. Stay away from gassy vegetables, such as cabbage, cauliflower...
Gluten-free foods are expensive for stores to stock, and then when the public does not buy the product, the store loses money. Some years ago I found a bread mix product made in Iowa, which local stores stocked, and I could buy online. Several years ago the business was sold, and shortly after, the new owner moved it to upstate Michigan. The business continues...
If you have been playing basketball and running all along, something else may be occurring. Histamine intolerance? No cure for that, only relief by following a low histamine diet.