Tomato (green)

Green tomatoes are simply unripe versions of a food already known for prompting histamine release — and the change in ripeness doesn't appear to remove that concern.

• Liberator properties persist — tomatoes in general, ripe or unripe, are considered histamine liberators; the compounds responsible for that appear to be present before the fruit fully ripens

• Acidity adds a layer — green tomatoes tend to be more acidic than ripe ones, and many people with histamine intolerance report that high-acid foods add to their overall reactivity, though this is based on common reporting rather than a firmly established mechanism

If ripe tomatoes are already a challenge, green tomatoes are unlikely to be easier to manage.