I had great success by doing intermittent fasting (I don't do it anymore). I had pollen, grass allergies, various food intolerance. I couldn't eat plums, grapes, figs, cherries, even bananas. My throat would get sore and lips swell.

After changing my diet and doing intermittent fasting for about a year I completely cured myself. I haven't grass allergy in more than 5 years. I can eat any fruit without any signs of discomfort.