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Elimination diets are pretty commonly prescribed where I am in the US.

Basically, eliminate everything that is not absolutely necessary, and then slowly add back things to see if they mess you up, and then you can at least isolate problem foods.

As I said elsewhere, figuring out the diet that works for you is important. But this is a personal thing. Every patient has different details, due to the quirks of their own digestion as well as to the areas that the disease is affecting.

Is that actually a cure though, or just avoiding the triggers that produce the symptoms?

Just avoiding triggers, there is no cure.

He had other issues as well, like permanent allergies.