I already know my allergies based on an IgE blood test; however, I found an amazing app for $3.99 for iPhones! You don’t have to know what your allergies are. Just need to document what you’ve eaten and your reactions. The thing I’ve noticed though, is that you can’t record symptoms that are “probably” from a chronic condition. Or the app will connect it to the food. It’s fine if they’re related to the food, but be careful not to make something look like an allergy, if it wasn’t related. My symptoms to a particular food come on within 2 hours, but this will show you patterns. http://www.foodallergydetective.com/ Check out the site for what the app can do! Very fascinating! I’m using the app to see which foods I’m challenging are affecting me.