Mushrooms may be low histamine. This may also be an unexpected answer, as many sources state that mushrooms are high histamine, and the general consensus is mixed. But this takes us back to the basic principles of low histamine eating: fresh is best. Fresh mushrooms of certain varieties (shiitake, reishi, chanterelle) are thought to be low histamine, but may have higher levels of other biogenic amines, which compete with histamine to be cleared from the body. But even if you’re okay with other amines, you may find it difficult to source fresh mushrooms or you may have a fungus sensitivity, so generally take caution when reintroducing mushrooms.