Does Ketchup Trigger IBS?
It depends. Small amounts of ketchup (one sachet or about 13g) are low-FODMAP and usually safe for IBS. However, larger servings can become moderate-FODMAP because ketchup contains concentrated tomatoes and sugar, which contribute fructose. Many brands also use high-fructose corn syrup. Stick to small portions.
What Makes Ketchup Problematic for IBS
Ketchup is made from concentrated tomatoes and sugar (or high-fructose corn syrup). At larger servings, the fructose content accumulates. Some brands contain onion powder or garlic powder as flavorings.
How it works
Concentrated tomatoes and added sugars provide fructose that can exceed absorption capacity at larger servings. High-fructose corn syrup in some brands adds excess fructose beyond what the body can absorb.
Common Symptoms
One small serving of ketchup is usually fine. Symptoms are more likely when using multiple servings or choosing brands with HFCS, garlic, or onion.
Portion Thresholds
Safe Portion
One sachet or tablespoon (13g) per meal
Research Reference
Monash University: Ketchup is low FODMAP at one sachet (13g). Moderate at two or more.
Practical Tip
Use a single sachet worth. Choose brands without high-fructose corn syrup, onion, or garlic. Organic ketchup often has simpler ingredient lists.
Related Foods
It depends. Plain tomato sauce made from just tomatoes is low-FODMAP at up to half a cup (100g). However, most commercial tomato sauces contain garlic, onion, and added sugars that make them high-FODMAP. Always check labels or make your own sauce using garlic-infused oil and canned tomatoes.
No. Fresh tomatoes are low-FODMAP and safe for IBS at up to one medium tomato (about 75g) per serving. Cherry tomatoes, Roma tomatoes, and canned diced tomatoes are all safe. The acidity may bother some people with reflux, but this is unrelated to FODMAPs. Avoid tomato sauces with added garlic and onion.
No. Plain yellow and Dijon mustard are low-FODMAP and safe for IBS at standard serving sizes (about one tablespoon). Mustard seeds contain no significant FODMAPs. Avoid whole grain mustards with added honey or garlic, and check labels on flavored varieties for high-FODMAP additives.
Frequently Asked Questions
Is ketchup safe for IBS?
Small amounts (one sachet / 13g) are low-FODMAP. Larger servings can accumulate fructose. Choose brands without HFCS, garlic, or onion.
Does ketchup contain FODMAPs?
At small servings, ketchup is low-FODMAP. The fructose from concentrated tomatoes and sugar becomes moderate at larger portions.
What is the best ketchup for IBS?
Choose organic or simple-ingredient ketchup made with sugar (not HFCS) and without garlic or onion powder. Use small portions.
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