Does Tomato Trigger IBS?
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.
What Makes Tomato Safe for IBS
Fresh tomatoes are not problematic for IBS from a FODMAP perspective. They contain minimal fermentable carbohydrates at standard serving sizes.
How it works
Tomatoes are low in fructose and contain no significant fructans, GOS, or polyols at standard servings. Their natural acidity does not affect FODMAP-related mechanisms.
Common Symptoms
Fresh tomatoes rarely cause FODMAP symptoms. If you experience issues after tomato-based dishes, the garlic and onion in sauces are likely the real culprits, not the tomatoes themselves.
Portion Thresholds
Safe Portion
One medium tomato (75g) or 5 cherry tomatoes per serving
Research Reference
Monash University: Common tomato is low FODMAP at 75g. Cherry tomatoes low at 5 tomatoes.
Practical Tip
Fresh, canned (plain), sun-dried (small amounts), and cherry tomatoes are all safe. When making pasta sauce, use garlic-infused oil instead of whole garlic.
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. Bell peppers (capsicum) are considered low-FODMAP and are generally safe for people with IBS in standard serving sizes. All colors — red, green, yellow, and orange — are well tolerated. Most people can enjoy them freely without experiencing bloating, gas, or other digestive symptoms.
No. Carrots are considered low-FODMAP and are generally safe for people with IBS at all portion sizes. They are one of the most reliable safe vegetables on a low-FODMAP diet. Most people tolerate them well whether raw, cooked, or steamed, without experiencing bloating or other digestive symptoms.
Frequently Asked Questions
Are tomatoes safe for IBS?
Yes. Fresh tomatoes are low-FODMAP at one medium tomato per serving. If tomato dishes cause symptoms, check for garlic and onion in the recipe.
Are cherry tomatoes low-FODMAP?
Yes. Cherry tomatoes are low-FODMAP at up to 5 tomatoes per serving.
Is tomato paste low-FODMAP?
Tomato paste is more concentrated and becomes moderate-FODMAP at larger amounts. Use up to 2 tablespoons per serving.
Sources & References
FODMAP grade and serving-size data for Tomato 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.
Track How Tomato Affects You
Everyone's gut is different. Use GutAI to scan foods, log symptoms, and discover your personal trigger map with AI-powered analysis.
Available on iOS & Web