It's basically an extremely healthy diet. There are some other things you can have but it's extremely limited. Nothing processed, no dairy, no nuts, nothing made in a factory, all you can pretty much have is cauliflower, broccoli, green beans, rice in a bag (not a box), and all meat has to be frozen. It has to be plain meat, chicken, steak, pork, salmon. It's hard finding stuff that's completely plain with no sweetener, flavorings, or anything. Since I can't leave the house it took my mom a bit to find it but at our Publix she found plain chicken breast that's organic, plain and frozen. Then I defrost it in warm water, you can only put salt pepper and garlic on it, cook it in a pan or oven, with rice and that's your every meal. The idea is that histamine grows more on food when it's cold and not frozen, the longer the food is out, the more histamine it has.
With this, you can't have leftovers which is hard so you have to freshly cook every meal, leaving any food in the fridge will produce histamine. Once a day I put a slice of grassfed butter on my rice. That's it. I used to eat 5 meals a day being a bodybuilder. Since I can't workout anymore anyways, I eat 3 times a day because cooking 5 meals is overkill. It's pretty much chicken and rice with pepper, garlic, salt, and olive oil on the pan. And here and there I'll throw in salmon or steak. You also have to take digestive enzymes with it before every meal.
This diet is supposed to allow things to heal, and apparently histamine can cause ATP leakage which is a suspected cause for inner ear noxacusis. I have so far seen and talked to three people who have brought their noxacusis from catastrophic to moderate or mild-moderate doing this diet. It's not a miracle yet for me but it's definitely helping. My setbacks are shorter. And my inner ear inflammation does not last as long.