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.
It depends on the type and the amount, and the numbers moved. Monash retested tomatoes and they are no longer unlimited: a common tomato is low-FODMAP at 65g, which is about half a medium one, and moderate by 75g. Cherry tomatoes are tighter still at 45g — roughly three. Canned tomatoes are the most generous at 100g. Plenty of older low-FODMAP guidance still calls tomatoes a free food, and that is out of date.
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.
Sources & References
FODMAP grade and serving-size data for Ketchup are based on published research from Monash University, the institution that developed the low-FODMAP diet. To understand how this data fits into a structured protocol, see our complete elimination diet guide.
- Monash University — About FODMAPs & IBS
- Monash University — Starting the Low-FODMAP Diet
- Halmos et al. (2014) — Low-FODMAP diet reduces IBS symptoms (Gastroenterology)
- NIDDK (NIH) — Irritable Bowel Syndrome
FODMAP thresholds are updated as new research is published. If you notice a portion that no longer matches the latest Monash guidance, let us know and we will update the page.
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