In certain eliminating diets you may need only few days (in general less than a week) to see results.
If you have a lactose intolerance, lactose-free diet should result in an obvious symptom relief in 2-4 days. You need to remove not only all dairy products, but also all commercial foods containing lactose as an additive. This may be a long list and not all lactose-containing products list lactose as an ingredient, so a safe way to test would be avoiding commercial foods as much as possible.
If you have a fructose malabsorption (as an only disorder), a low-fructose (- some other nutrients) diet should give obvious results in 2-4 days. For the diet trial you need to exclude (roughly) fruits and fruit products, honey, wheat products, onions, artichokes, asparagus, sweet foods in general and any commercial food containing fructose, HFCS, sucrose, polyols or sugar alcohols (sorbitol, xylitol, maltitol, mannitol...), and to be sure, any sweetener, fructooligosaccharides (FOS) and inulin.
If you have a celiac disease, avoiding gluten may (not always) result in symptoms relief in 1-2 weeks. Gluten is in wheat, rye, barley and sometimes in oats (contamination during production process). Gluten is in many commercial foods and usually listed as an ingredient.
If you have a food allergy, elimination of suspected foods for few days should result in an obvious symptoms relief.
I want to say, you might need only few days (not months) for every diet trial, so they should not be so hard, especially not trials for lactose intolerance and fructose malabsorption.
-------------------- I don't have IBS.
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