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Vegetables and starchy roots

Tomato

Tomatoes are 95% water, so 100 g (3.5 oz) brings only 18 kcal and 1.2 g of fiber.

USDA description: Tomato, raw

  • Low energy density
  • Hydrating

Estimated satietyHow it is calculated

Starting point+1
Very low energy density+2
Moderate protein per calorie+1
A lot of fiber per calorie+2
High water content+1
Sum7
Capped at 55

Our own estimate from the values per 100 g: useful for comparing foods with each other, not a measurement in people. Holt index (1995): this food was not measured.

Prepared by
Last updated
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Sources
7 primary
Data
USDA FDC 170457

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Nutrition facts

Calories
27 kcal per serving
18 kcal per 100 g (3.5 oz)
Protein
1.3 g per serving
0.9 g per 100 g (3.5 oz)
Carbohydrates
5.8 g per serving
3.9 g per 100 g (3.5 oz)
of which sugars
3.9 g per serving
2.6 g per 100 g (3.5 oz)
Fiber
1.8 g per serving
1.2 g per 100 g (3.5 oz)
Fat
0.3 g per serving
0.2 g per 100 g (3.5 oz)
of which saturated
0 g per serving
0 g per 100 g (3.5 oz)
Water
141.8 g per serving
94.5 g per 100 g (3.5 oz)

Source: USDA FoodData Central: Tomatoes, red, ripe, raw, year round average (FDC ID 170457), accessed September 23, 2026.

A typical 150 g (5.5 oz, about 3/4 cup) serving provides about 27 kcal, 1.3 g of protein, and 1.8 g of fiber.

The typical serving (150 g (5.5 oz, about 3/4 cup)) is a common amount used for the math, not a recommendation. Ounces and cups are rounded US equivalents; the values come from the database entry cited in the sources.

What it is and how to eat it

In much of Mexico the tomato is called jitomate, because "tomate" there usually means the green husk tomato, or tomatillo, a different species. It is sold year-round in many varieties, such as salad, plum and cherry tomatoes or, in Spain, the Raf tomato, and it is eaten raw, in sauces, in stews or blended into gazpacho. This page covers raw ripe red tomato, with 18 kcal, 94.5 g of water and 1.2 g of fiber per 100 g according to USDA.

A 150 g (5.3 oz) serving provides only 27 kcal, 1.8 g of fiber and about 142 g of water, and this site's guide to hydration on GLP-1 medications lists it among the solid foods that provide the most water per serving. It has very little protein, 1.3 g, so it goes alongside the protein part of the plate, as in the gazpacho with hard-boiled egg and serrano ham, the caprese salad with mozzarella and arugula or the cottage cheese bowl with tuna, tomato, and avocado. The US National Institutes of Health include tomatoes among the acidic foods that can make reflux worse, a common side effect of semaglutide (Wegovy) in its 68-week trials, according to its label; if you get heartburn, try a smaller amount and note whether it helps.

What the evidence says

Lycopene is the red pigment in tomatoes, and USDA lists 2570 µg per 100 g of raw tomato, about 3.9 mg per serving. In 2011 EFSA assessed claims that lycopene protects DNA, proteins and lipids from oxidative damage, protects the skin from UV damage, contributes to normal heart function and maintains normal vision, and found none of these effects substantiated. As a result, the EU has not authorized any health claim for lycopene, and no food or supplement may advertise those effects. With 13.7 mg of vitamin C per 100 g, tomatoes do reach the 12 mg the EU requires for a "source of vitamin C" claim (Regulations (EC) No 1924/2006 and (EU) No 1169/2011).

The sources for this section are listed under "Sources" at the end of the page.

Recipes with this food

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Satiety

The 1 to 5 score is our own estimate: it starts at 1 point, adds points for low energy density, for protein and fiber per 100 kcal, and for the water in solid foods, and subtracts points for drinks with calories. It is useful for comparing foods with each other; it is not a measurement in people.

What to keep in mind on a GLP-1 medication

Low energy density
It has 100 kcal or less per 100 g: plenty of volume for few calories, which helps you feel full. On a GLP-1 medication, which already reduces your appetite, make sure these foods do not push protein foods off your plate.
Hydrating
It has 85 g of water or more per 100 g, so it contributes to hydration. That helps because with a smaller appetite people also tend to eat and drink less, and not drinking enough can make constipation worse.

Frequently asked questions about tomatoes

How many grams of protein are in a 150 g (5.5 oz) serving of tomatoes?

100 g (3.5 oz) of tomatoes has 0.9 g of protein. A typical 150 g (5.5 oz) serving has about 1.3 g of protein. That is 4.9 g of protein per 100 kcal.

How many kcal are in a 150 g (5.5 oz) serving of tomatoes?

100 g (3.5 oz) of tomatoes has 18 kcal. A typical 150 g (5.5 oz) serving has about 27 kcal. That is a very low energy density.

How much fiber is in a 150 g (5.5 oz) serving of tomatoes?

100 g (3.5 oz) of tomatoes has 1.2 g of fiber. A typical 150 g (5.5 oz) serving has about 1.8 g of fiber.

Do tomatoes keep you full?

Yes, very filling for the calories they provide: our estimated satiety score is 5 out of 5. It is based on: very low energy density; moderate protein per calorie; a lot of fiber per calorie; high water content. It is an estimate based on its composition, not a measurement in people.

How do tomatoes fit into eating on Ozempic, Wegovy, Mounjaro, or Zepbound?

Based on our tags, this is what matters about tomatoes on a GLP-1 medication. “Low energy density”: plenty of volume for few calories; make sure it does not push protein foods off your plate. “Hydrating”: a lot of water, which contributes to hydration when you eat and drink less. These are general guidelines, not medical advice: everyone tolerates foods differently.

What is a typical serving of tomatoes?

We use 150 g (5.5 oz) as a typical serving, about 3/4 cup. That amount provides about 27 kcal, 1.3 g of protein, and 1.8 g of fiber. It is a reference for calculations, not a recommendation of how much to eat.

See all foods

Sources

Sources for the data on this page, with the access date.

  1. Official databaseU.S. Department of Agriculture, Agricultural Research Service.USDA FoodData Central: Tomatoes, red, ripe, raw, year round average (FDC ID 170457).accessed .
  2. InstitutionNational Institute of Diabetes and Digestive and Kidney Diseases (NIH).Eating, Diet, & Nutrition for GER & GERD.accessed .
  3. Drug labelEuropean Medicines Agency.Wegovy (semaglutide): EU Summary of Product Characteristics, section 4.8 (undesirable effects), current version.accessed .
  4. RegulatorEFSA Journal.EFSA NDA Panel. Scientific Opinion on the substantiation of health claims related to lycopene and protection of DNA, proteins and lipids from oxidative damage (ID 1608, 1609, 1611, 1662, 1663, 1664, 1899, 1942, 2081, 2082, 2142, 2374), protection of the skin from UV-induced (including photo-oxidative) damage (ID 1259, 1607, 1665, 2143, 2262, 2373), contribution to normal cardiac function (ID 1610, 2372), and maintenance of normal vision (ID 1827) pursuant to Article 13(1) of Regulation (EC) No 1924/2006. EFSA Journal. 2011;9(4):2031. doi:10.2903/j.efsa.2011.2031.accessed .
  5. RegulatorEuropean Commission.EU Register of nutrition and health claims made on foods.accessed .
  6. RegulatorOfficial Journal of the European Union (EUR-Lex).Regulation (EC) No 1924/2006 on nutrition and health claims made on foods (Annex).accessed .
  7. RegulatorOfficial Journal of the European Union (EUR-Lex).Regulation (EU) No 1169/2011 on the provision of food information to consumers (Annex XIII, nutrient reference values).accessed .