Yes, tomatoes contain fiber. A medium raw tomato has about 1.5 to 2 grams of dietary fiber, which covers roughly 4% of the recommended daily value. That’s a modest amount, but tomatoes show up so frequently in meals that their fiber adds up over the course of a day.
How Much Fiber Is in a Tomato
The exact amount depends on the size and variety. Per 100 grams of raw tomato, you get about 1.2 to 1.3 grams of total dietary fiber. Here’s how common varieties compare:
- Medium tomato (148 g): about 1.5 to 2 grams of fiber
- Roma tomato (62 g): about 1 gram of fiber
- Large beefsteak tomato (182 g): about 2 grams of fiber
- Cherry tomato (17 g): trace amounts
A single cherry tomato is too small to register meaningful fiber, but a full cup of cherry tomatoes (about 10 to 12) brings you into the same range as one medium tomato.
Soluble vs. Insoluble Fiber in Tomatoes
Not all fiber works the same way in your body. Soluble fiber dissolves in water and forms a gel-like substance during digestion, which helps slow the absorption of sugar and can lower cholesterol. Insoluble fiber doesn’t dissolve. It adds bulk to stool and helps food move through your digestive tract more efficiently.
Tomatoes are heavily skewed toward insoluble fiber. USDA data shows that per 100 grams, raw tomatoes contain about 1.19 grams of insoluble fiber and only 0.15 grams of soluble fiber. That means roughly 89% of the fiber in a tomato is the insoluble type. This makes tomatoes particularly useful for digestive regularity rather than, say, blood sugar management, where soluble fiber plays a bigger role.
Where the Fiber Comes From
Most of a tomato’s fiber is concentrated in the skin and the seeds, not the watery flesh. Research characterizing tomato fiber found that it is composed primarily of carbohydrates, with total dietary fiber making up about 80% of the dry weight of tomato skin and seed material. This is a higher fiber density than many other vegetable byproducts.
This matters practically. If you peel tomatoes for a sauce or strain out the seeds, you’re removing the majority of the fiber. Keeping the skin on, even in cooked dishes, preserves most of it.
Does Cooking Change the Fiber
Cooking tomatoes does alter fiber slightly, but not in a way that should concern you. Heat breaks down some of the insoluble fiber, making it easier to digest. The total amount of fiber doesn’t disappear; it just becomes less rigid in structure. Cooking tomatoes also makes certain nutrients easier for your body to absorb.
Canning follows a similar pattern. Canned tomatoes, tomato paste, and tomato sauce all retain fiber. In fact, tomato paste is more concentrated, so tablespoon for tablespoon it delivers more fiber than a raw tomato. Tomato juice, on the other hand, loses most of its fiber during processing because the pulp and skin are strained out.
How Tomatoes Compare to Other Vegetables
Tomatoes are not a high-fiber food by any stretch. For comparison, a cup of cooked broccoli has about 5 grams of fiber, a medium artichoke has around 7 grams, and a cup of cooked lentils delivers about 16 grams. Among common salad vegetables, tomatoes sit in a similar range to cucumbers and bell peppers, all of which provide 1 to 2 grams per serving.
Where tomatoes have an edge is frequency of consumption. Most people eat tomatoes far more often than artichokes or lentils. Between sliced tomatoes in a sandwich, salsa, pasta sauce, and salads, the cumulative fiber from tomatoes across a week can be meaningful. Two or three servings a day, which is easy to hit if you cook with tomato-based sauces, could contribute 4 to 6 grams of your daily fiber intake.
Practical Ways to Get More Fiber From Tomatoes
If you want to maximize the fiber you get from tomatoes, a few simple choices help. Leave the skin on whenever possible. Choose whole canned tomatoes or crushed tomatoes over juice or heavily strained sauces. Use tomato paste as a base for soups and stews, since its concentrated form packs more fiber per spoonful. And when snacking, grab a handful of cherry tomatoes rather than reaching for tomato juice, which has had most of the fiber filtered out.
Pairing tomatoes with other fiber-rich foods amplifies the benefit. A salad with tomatoes, chickpeas, and avocado, or a chili built on beans and crushed tomatoes, turns a modest fiber source into part of a high-fiber meal.