Food Sensitivity Symptoms Explained

Food sensitivity testing has become extremely popular in the last few years. I remember when I first got a food sensitivity test from my Naturopathic doctor in 2010 and none of my friends had even heard about it. Now we are bombarded by food sensitivity testing companies on Instagram and Facebook that we can order without a doctor. But what do the results mean? How do we heal? Do I have to avoid these foods for the rest of my life?