They are essentially the only way to discover allergies and intolerancs. The RASP and skin tests simply don't work - I spent $500 on the skin test and it indicated I'm not allergic to corn or wheat, when I'm so allergic to corn that a reaction can put me in the ER. elimination diets are extremely strict, and they are most effective when you eliminate all flour, sugar, alcohol, dairy, and starch too. Even if you are not allergic to these things, they cause inflammation, digestive sluggishness, and energy issues that can get in the way of distinguishing an allergic reaction. Also, you have to be very careful about what meat you eat while on it. I react to corn fed beef, because I'm allergic to corn. Conventional meat is often tenderized with corn and wheat too. So eat as simple as possible, with grass fed natural meat. Also, if you notice digestive issues while on the diet, try cooking down all your veggies before eating. Avoid all raw vegetables because they are actually very hard to break down, which can work the gut too much.
Are you up to the challenge?
Personally, I find it's easier to eat very simply all the time instead of ever eating allergenic foods. I don't need bread, candy, fast food, processed meats, boxed snacks, and the like. Elimination diets essentially help you find out what junk food you can get away with eating. Food either heals or hurts. It is never neutral. I only eat healing foods: for me, based on my blood type O, they are grass fed beef and lamb, pasture raised chicken and turkey, non-starch vegetables cooked, certain tree nuts and seeds, and tea. Eating so strictly is easier, because I don't spend the time reading tons of ingredients on foods that wouldn't heal me anyway.