If you have a gluten intolerance or a food allergy, you can change the food filters to match. On the meal planner page, click the Settings link in the sidebar to head to the generator's settings page. Then go to the "food filters" section and check off any foods that you might have an allergy to, or just plain don't want to see. There is a "Gluten" allergy button that will filter out any ingredients that have gluten in them.
If you notice any specific recipes getting through your filters that shouldn't be, please feel free to send us an email at email@example.com - there's also a "report recipe" button on recipes to let us know that something is showing up that shouldn't be.