Tomato seeds are perfectly safe to eat. Most people swallow them every time they bite into a fresh tomato, toss one into a salad, or eat pasta sauce, and there’s no reason to pick them out. They pass through your digestive system without causing harm, and they actually contain some useful nutrients along the way.
How Your Body Handles Tomato Seeds
Tomato seeds have a tough outer coat that largely resists breakdown in your stomach. Forensic research has shown that seeds recovered from stomach contents still have intact DNA, meaning the protective shell holds up well against stomach acid. This is why you might occasionally notice seeds passing through your system visibly unchanged.
That durability is not a problem. Small, smooth seeds like those in tomatoes move through the digestive tract without irritating or obstructing anything. They’re tiny enough that they don’t pose a choking risk or get lodged anywhere along the way. Your body simply passes what it can’t fully break down.
Nutrients Inside the Seeds
Tomato seeds are more nutritious than their small size suggests. Analysis of dried tomato seeds found they contain roughly 25% protein, 20% fat, and 35% dietary fiber by weight. They also provide calcium, phosphorus, and a moderate calorie density. You won’t get large quantities of these nutrients from the handful of tiny seeds inside a single tomato, but they contribute rather than detract from the fruit’s overall nutritional value.
The fat in tomato seeds is predominantly linoleic acid, an omega-6 fatty acid that makes up about 62% of the oil content. Tomato seed oil also contains phenolic compounds with antioxidant properties. These are the same types of beneficial plant compounds found throughout fruits and vegetables, concentrated here in the seed.
The Diverticulitis Myth
For decades, doctors told patients with diverticulitis (a condition where small pouches in the colon become inflamed) to avoid seeds, nuts, corn, and popcorn. The theory was that small particles could lodge in those pouches and trigger flare-ups. Tomato seeds were a frequent target of this advice.
That guidance has been thoroughly debunked. A large prospective cohort study tracking women over time found no association between eating seeds, nuts, or fresh fruits with edible seeds (including tomatoes and strawberries) and the risk of developing diverticulitis. Women in the highest intake group had virtually the same risk as those who ate the least. The researchers concluded their findings “refute the widely held belief that dietary intake of particulate matter should be avoided to prevent diverticulitis.” If you’ve been avoiding tomato seeds for this reason, the evidence says you can stop.
What About Lectins and Tomatine?
Lectins are proteins found in many plant foods, especially seeds, grains, and legumes. In concentrated forms, certain lectins can irritate the gut lining. Raw kidney beans, for example, contain enough of a specific lectin to cause vomiting within hours. Tomatoes do contain a lectin, but the amounts present in the seeds and flesh you’d eat in a normal diet are far lower than those associated with acute illness from high-lectin foods like undercooked beans.
Tomatine, a natural compound in the tomato plant, is another concern people sometimes raise. Research measuring tomatine levels across different parts of the tomato plant found the highest concentrations in the leaves, with much lower levels in stems and whole-plant averages. The ripe fruit, including its seeds, contains very little tomatine compared to the green parts of the plant you’d never eat anyway. Tomatine levels drop dramatically as tomatoes ripen, which is one reason ripe tomatoes taste milder than green ones.
When You Might Want to Remove Them
Some recipes call for deseeding tomatoes, but this is about texture and moisture control, not safety. Tomato seeds sit in a gel-like liquid that can make sauces watery or give a dish a slightly bitter edge in large quantities. If you’re making a smooth soup, a refined sauce, or a delicate bruschetta topping, straining out the seeds and their surrounding gel can improve the final result.
For everyday eating, there’s no nutritional or medical reason to go through the effort. Slice your tomatoes, eat them whole, blend them into smoothies, or cook them into sauce with the seeds included. Your body will handle them just fine.