Great question! One of the first ways is to eliminate it from your diet for 1 month and see how you feel. If bloating, achines, headaches and general malaise disappear you can bet you are sensitive. If you want an actual test, you can test for gluten sensitivity through a variety of tests that have to be ordered by a health professional. If you would like more information on this I would be happy to provide that information for you.
Why do you need to test please? If you are not having positive experience when eating gluten then you've already tested out of that class. Sarah makes a sound point about eliminating foods from your daily intake for a period of time. For some that may be a week for others it is 6 months. And it presumes the person is aware enough in the first place to notice the difference. So I'd encourage a food diet first, keeping track of what you eat, when you eat and how you feel after.
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