Overview
About Ketchup
Ketchup is the textbook stacked trigger: no single ingredient in it is extreme, but it borders on a problem across an unusual number of them at once.
It is made from concentrated tomatoes (nightshade plus histamine), cooked and aged (histamine and glutamate build up), sweetened with high-fructose syrup (excess fructose and FODMAPs) and often preserved with sulfites. Individually each is a moderate load; together, in the amount people actually use, they can push a sensitive person over the edge when a plain tomato would not. If you react to ketchup but tolerate fresh tomato, the processing is usually why.
Sensitivities
How Ketchup scores
Watch for
What trips people up
- Concentrated tomato makes it a nightshade and moderately high in histamine, two triggers in one spoonful
- Cooking and ageing raise free glutamate (a savoury, MSG-like load) and histamine beyond that of a fresh tomato
- Sweetened with high-fructose corn syrup, so it carries excess fructose and a moderate FODMAP load
- Often preserved with sulfites, a further additive trigger, and it is pro-inflammatory overall thanks to the sugar and processing
Diet fit
Where it fits
Swap ideas
More alternatives
FAQ
Common questions about Ketchup
Why do I react to ketchup but not to fresh tomatoes?
Because ketchup is far more than tomato. It is concentrated, cooked and aged, which raises histamine and glutamate, then sweetened with high-fructose syrup and often preserved with sulfites. A fresh tomato gives you the nightshade and a little histamine; ketchup gives you all of that plus fructose, extra histamine, glutamate and additives in one spoonful, so it can trip a threshold that a raw tomato does not.
What makes ketchup a problem for so many different sensitivities?
It stacks moderate loads. On their own the nightshade, histamine, fructose, glutamate and sulfite content are each only borderline, but they arrive together and in generous amounts. People with histamine intolerance, FODMAP sensitivity, nightshade issues or sulfite sensitivity can all find their particular trigger in the same bottle, which is why ketchup shows up so often in food-symptom journals.
Is there a low-histamine or low-FODMAP ketchup alternative?
Fresh and unsweetened is the goal. An unsweetened cranberry relish or a blitz of cooked beetroot gives you a sweet-tart red sauce without the aged histamine, added fructose and sulfites of the bottled version. Because both drop the tomato, they also suit people whose real issue is the nightshade.
References
Read the background
Ratings reflect the Triggerbites ingredient database and may vary with portion size and preparation.