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Are Tomatoes Keto-Friendly?

Tomatoes on a kitchen counter

Are Tomatoes Keto-Friendly?" might be a question you've considered if you're embarking on a ketogenic diet.

Well, the good news is, they indeed are.

In this article, we delve into the low net carb content of tomatoes and how their nutritional profile makes them an excellent fit for a keto meal plan.

We'll explore the health implications of including tomatoes in your diet, offer tips on incorporating them into your meals, and brief you on some keto-compatible alternatives.

You'll also get the lowdown on their overall benefits and nutritional value.

Let's dive in and unravel the keto-friendliness of tomatoes together.


  • Yes, tomatoes are keto-friendly due to their low net carb content.
  • Tomatoes are rich in vitamins, essential minerals, and the antioxidant lycopene.
  • Discover unique ways of incorporating tomatoes into your keto meal plan by reading further.

Are Tomatoes Keto-Friendly?

Tomatoes are indeed keto-friendly. This assertion is backed by their nutritional composition, which reveals that tomatoes contain a mere 2.69g of carbohydrates per 100g.

Can You Have Tomatoes on a Strict Keto Diet?

Yes, tomatoes fit into even a strict ketogenic diet, which typically allows less than 20g of carbohydrates per day. Given that tomatoes carry merely 2.69g of net carbs in a typical 100g serving, they can easily be incorporated without exceeding this carb limit.

Beyond the strict keto diet, there are individuals following a low carb diet plan where the daily net carb intake is limited to 30-50g. In this scenario, tomatoes are also a suitable option, contributing minimally to the daily carb intake while providing significant nutritional value.

Carbs In Tomatoes

Tomatoes contain 2.69g of net carbs per 100g serving. Net carbs are the carbohydrates that your body can digest and use for energy, calculated by subtracting the fiber content from the total carbohydrates. When it comes to the glycemic index, which measures how a food can affect blood sugar levels, tomatoes are considered to have a low glycemic index. This characteristic is mainly due to their low carbohydrate content and significant amount of dietary fiber, making them an ideal choice for a low-carb, ketogenic diet.

Tomatoes Nutrition Facts

A 100g portion of tomatoes is rich in various nutrients. It provides 18 calories, primarily from its 3.9g of carbohydrates. Tomatoes have minimal fat (0.2g) and a decent amount of protein (0.9g). They are a good source of fiber, offering 1.2g per serving.

In terms of micronutrients, tomatoes are well-known for their high vitamin C content, providing 14mg or 17% of the daily value. They're also a good source of vitamin K1, supplying 7.9mcg or 7% of the daily value. Other vitamins present include vitamin A, E, and some B-vitamins like folate.

Tomatoes also contain an array of minerals. They provide potassium and manganese, along with minor amounts of magnesium, copper, and zinc.

A key nutrient in tomatoes is lycopene, a powerful antioxidant. This is what gives tomatoes their red color, and contributes to many of their health benefits.

Nutrient NameAmount and Unit per 100g
Net Carbs2.69g
Carbohydrate, by difference3.89g
Fiber, total dietary1.2g
Total fats0.2g
Sodium, Na5.0mg
Potassium, K237.0mg
Magnesium, Mg11.0mg
Calcium, Ca10.0mg
Vitamin A42.0ug
Vitamin B-60.08mg
Vitamin C, total ascorbic acid13.7mg
Vitamin E (alpha-tocopherol)0.54mg
Vitamin K17.9ug
Copper, Cu0.06mg
Iron, Fe0.27mg
Phosphorus, P24.0mg
Zinc, Zn0.17mg
Fluoride, F2.3ug
Lutein + zeaxanthin123.0ug
Manganese, Mn0.11mg
Pantothenic acid0.09mg
Folate, total15.0ug
Choline, total6.7mg
Aspartic acid0.14g
Glutamic acid0.43g
Fatty acids, total saturated0.03g
Fatty acids, total monounsaturated0.03g
Fatty acids, total polyunsaturated0.08g
Nutritional data is sourced from the US Department of Agriculture's FoodData Central system. Please see Cast Iron Keto's editorial and research standards for more information.

Health Implications of Tomatoes on a Keto Diet

Tomatoes offer a wealth of nutrients that enhance both the flavor and the health-benefit profile of a keto diet. They are rich in vitamins like Vitamin C, Vitamin A, and several B-vitamins. Moreover, they contain essential minerals including potassium, magnesium, and calcium. Also noteworthy is the presence of lycopene, a powerful antioxidant. On the downside, while tomatoes do not contain unhealthy fats, those on sodium-restricted diets might need to moderate their intake as tomatoes do contain some sodium.

Incorporating Tomatoes into Your Keto Meal Plan

  1. Tomatoes can be incorporated into salads along with other keto-friendly vegetables and a source of protein. They add a refreshing zest, color, and nutritional boost to your meal.
  2. For a heartier option, consider a tomato-based soup or stew using a selection of low-carb vegetables and lean meats. A homemade tomato and basil soup, for instance, can be a delightful addition to your meal plan.
  3. Tomatoes make a great accompaniment to eggs in the morning. A simple scrambled egg dish with fresh cherry tomatoes and some seasoning can make for a quick, nutrient-rich start to the day.

Keto-Compatible Alternatives for Tomatoes

  1. Cucumbers can be a viable alternative to tomatoes. They are equally refreshing and offer a lower carb count per serving, making them an excellent choice for salads or as a crunchy snack.
  2. Bell peppers, particularly the green variety, are another excellent substitute. They can be used in stir-fries, stuffed with low-carb fillings, or simply sliced for a vibrant addition to salads. Their carb content is similar to that of tomatoes, but they offer a different flavor profile.
  3. Zucchini is another versatile, keto-friendly substitute. It can be spiralized into 'noodles', grilled, or used in baking. While zucchini also has a similar carb content to tomatoes, it has a different texture and neutral taste, which allows it to absorb the flavors of the dishes it's incorporated into.

Concluding Thoughts on Tomatoes and Keto

Tomatoes, with their low net carb content and wealth of beneficial nutrients, are a fitting inclusion in a keto diet plan. Their versatility in various recipes and overall nutritional value can be a significant advantage, offering not only taste but also health benefits. Beyond simply incorporating tomatoes into your meals, consider exploring different varieties of tomatoes, such as heirloom or cherry tomatoes, for a diverse range of flavors and textures. Don't be afraid to experiment with tomatoes in your keto journey, as their low-carb nature and high nutritional profile make them an excellent choice. Remember to maintain portion control and keep track of other foods in your meal plan to ensure you're staying within your carb limit. As a unique idea, consider growing your own tomatoes if you have the space. This could provide an added enjoyment to your keto journey, knowing you're consuming something you've cultivated yourself.

Cast Iron Keto's Editorial and Research Standards

Certain rare or exotic food items may not have nutritional profiles in the FoodData Central database. If an exact match is not found in the FoodData Central database, then, the Cast Iron Keto team utilizes a three-prong approach to provide readers with the closest relevant nutritional data, where possible.

First, in the event that nutritional profiles for a rare or exotic food item is not available in the FoodData Central database, we investigate alternative names for that particular food item and use that data, when possible. Second, in cases where no alternate names exist, Cast Iron Keto will use nutritional data for a close relative or similar food item. Finally, if no close relatives or similar items exist, we refrain from publishing nutrient data tables.

When making dietary or health decisions based on FoodData Central's data, we suggest readers consult with a nutritionist or other health experts, particularly if the food in question has a significant role in your diet or if you are using the food item to treat any health disorder(s).

Furthermore, it is important to note that even if a close relative or similar item is used to approximate the nutritional data, different food items can have varying levels of nutrients due to factors such as soil quality, farming practices, and regional differences.


The information on this website is only intended to be general summary information for public use, designed for educational purposes only and is not engaged in rendering medical advice or professional services. This information does not replace written law or regulations, nor does it replace professional medical advice, diagnosis, or treatment. If you have questions about a medical condition or are seeking to evaluate the health merits of certain food items for the treatment of any medical condition, you should seek the advice of a doctor or other qualified health professionals.

The views expressed at, or through, Cast Iron Keto are for informational purposes only. Cast Iron Keto cannot guarantee the validity of the information found here. While we use reasonable efforts to include accurate and up-to-date information, we make no warranties as to the accuracy of the content and assume no liability or responsibility for any errors or omissions in the content. All liability with respect to actions taken or not taken based on the contents of this website are hereby expressly disclaimed. The content on this posting is provided "as is;" no representations are made that the content is error-free.

Frequently Asked Questions

Yes, all varieties of tomatoes, including cherry, beefsteak, and heirloom, are generally keto-friendly due to their low net carb content. The carb count may slightly vary between types, but all remain suitable for a keto diet in appropriate portions.