Low-Carb Fruits: An Evidence-Based List (Net Carbs Included)

Low-carb doesn’t have to mean no fruit. It just means being picky. A cup of raspberries has about 7 grams of net carbs. A medium banana has 24. Same food category, radically different impact on your carb budget.

This is a straight, practical list of the lowest-carb fruits, with USDA-based net-carb numbers, plus what to eat sparingly, and how to think about fruit in keto, low-carb, and diabetic diets.

Low-Carb Fruits at a Glance

All figures are per 100 grams (about 3.5 oz) using USDA FoodData Central. Net carbs = total carbs minus fiber.

Source: USDA FoodData Central, standard reference values. “Keto-friendly” assumes a 20 to 50 g daily net-carb ceiling.

In This Article

• Net carbs vs. total carbs
• The 10 lowest-carb fruits
• Fruits to eat sparingly on low-carb
• Fruits to mostly skip on strict keto
• Practical portions and ideas
• FAQ

Net Carbs vs. Total Carbs (Why It Matters)

Net carbs = total carbs minus fiber (and, for some, minus sugar alcohols). Fiber isn’t absorbed as glucose, so it doesn’t spike blood sugar. Most low-carb and keto approaches use net carbs to track intake.

This matters for fruit: berries are high-fiber, so their net carb count is much lower than their total carb count. Bananas and grapes are the opposite: low fiber, high sugar.

The 10 Lowest-Carb Fruits (Yes, Some You Might Not Think Of)

1. Avocado (1.8 g net carbs per 100 g)

Botanically a fruit. Practically the lowest-carb one you can eat. One medium avocado has about 3 g net carbs and 9 g fiber. Loaded with monounsaturated fat, potassium, and folate. Keto staple for good reason.

2. Olives (3 to 4 g net carbs per 100 g)

Also a fruit. Black or green, both work. Sodium is high so watch that if you’re monitoring blood pressure. Great for satisfying salt cravings on keto.

3. Tomatoes (2.7 g net carbs per 100 g)

Also a fruit. Cherry tomatoes are a legitimate low-carb snack. Rich in lycopene, an antioxidant linked to prostate and cardiovascular health.

4. Raspberries (5.4 g net carbs per 100 g)

The most fiber-dense berry. A half-cup adds up to about 3 g net carbs. Very keto-friendly. Also one of the highest ellagitannin fruits, a polyphenol group with early cardiometabolic research behind it.

5. Blackberries (4.3 g net carbs per 100 g)

Similar profile to raspberries. High vitamin C, high manganese, low net carb load. A half-cup is about 3 g net carbs.

6. Strawberries (5.7 g net carbs per 100 g)

Slightly higher net carbs than raspberries or blackberries, but still very manageable. Highest vitamin C among common berries. Eight medium berries is about 8 g net carbs.

7. Watermelon (7.1 g net carbs per 100 g)

Mostly water. Low fiber, but the actual carb load per cup is modest. A cup of cubes runs about 11 g net carbs. Good for hydration on hot days.

8. Cantaloupe (7.3 g net carbs per 100 g)

Similar to watermelon. Adds vitamin A and potassium. A one-cup serving is about 11 g net carbs.

9. Peaches (8.4 g net carbs per 100 g)

Higher than berries, but still reasonable in half-fruit portions. One medium peach is about 13 g net carbs.

10. Plums (10 g net carbs per 100 g)

Small enough that one plum (about 66 g) is only 7 g net carbs. Contain sorbitol, which has a mild laxative effect (useful for constipation, uncomfortable for IBS).

Fruits to Eat Sparingly on Low-Carb

• Blueberries (12 g net carbs per 100 g): Great antioxidants; watch the portion. A quarter-cup is about 5 g net carbs.
• Pineapple (12 g per 100 g): Sugary. A small ring is fine occasionally.
• Apple with skin (11 g per 100 g): A medium apple is around 22 g net carbs.
• Pear (12 g per 100 g): Similar to apple.
• Kiwi (12 g per 100 g): Two kiwis is about 18 g net carbs. Good for constipation.
• Star fruit (5 g per 100 g): Actually low-carb, but avoid if you have kidney disease (contains caramboxin, which is neurotoxic in kidney impairment).

Fruits to Mostly Skip on Strict Keto

• Banana: A medium banana is 24 g net carbs. Would eat your entire keto budget.
• Mango: A cup of mango is about 22 g net carbs.
• Grapes: Sugar bomb; a cup is about 26 g net carbs.
• Dried fruit (raisins, dates, dried apricots): Concentrated sugar. A tablespoon of raisins is about 8 g net carbs.
• Fruit juice: All sugar, no fiber. Even 100% juice spikes blood sugar like soda.
• Cherries: Higher net carb (12 g per 100 g); a cup runs about 17 g net carbs.

None of these are “bad.” They’re just budgeted differently. On a moderate low-carb diet (100 g net carbs a day) a banana is fine. On strict keto (20 g), it’s not.

Practical Portions and Ideas

Berry portions that actually fit

• Half cup raspberries or blackberries: ~3 g net carbs
• Half cup strawberries (sliced): ~4 g net carbs
• Quarter cup blueberries: ~5 g net carbs

Easy ways to use them

• Berries on top of full-fat Greek yogurt
• Half an avocado with lemon and salt
• Cherry tomatoes with mozzarella and olive oil
• Sliced strawberries in salad with feta and walnuts
• Watermelon cubes with feta and mint (5 to 6 g net carbs per small bowl)
• Blackberries stirred into cottage cheese

If you’re monitoring blood glucose

Even low-carb fruits raise blood sugar, just less than high-carb ones. If you’re diabetic and use a CGM (continuous glucose monitor), test individual fruits against your own response. Some people tolerate berries beautifully and spike hard on watermelon; others are the reverse.

The Bottom Line

Berries (raspberries, blackberries, strawberries), avocado, olives, and tomatoes are your low-carb fruit toolkit. Melons and stone fruit are fine in small portions. Bananas, grapes, mango, and dried fruit blow up a strict low-carb budget.

Fruit isn’t the enemy of low-carb eating. It just needs to be portioned the way any other carb does. Berries and half an avocado on a plate is not the same food category as a banana smoothie.

Frequently Asked Questions

Can I eat fruit on keto?

Yes, in small portions of the lowest-carb options: avocado, olives, tomatoes, raspberries, blackberries, strawberries. A half-cup of berries fits most keto budgets.

Which fruits are best for diabetes?

The same low-carb, high-fiber ones: berries, avocado, tomatoes. Also apples and pears eaten with skin (fiber slows glucose absorption). Individual glucose response varies, so testing helps.

What about fruit juice?

Even 100% fruit juice is essentially sugar in liquid form. It spikes blood sugar comparably to soda. Whole fruit is a better choice on any carb-conscious plan.

Why net carbs instead of total carbs?

Fiber isn’t absorbed as glucose, so it doesn’t raise blood sugar. Subtracting fiber gives a more accurate read on how a food affects your carb intake and blood glucose.

Are berries really low-carb?

Yes. Raspberries and blackberries are among the lowest-carb fruits per gram, thanks to their high fiber content.

Is avocado really a fruit?

Botanically yes: a single-seeded berry. It’s used culinarily as a vegetable/fat source.

What can I use instead of banana in a smoothie?

Frozen berries with unsweetened almond milk, Greek yogurt, and a tablespoon of nut butter give a similar creamy texture with a fraction of the carbs. Half a frozen avocado can also stand in.

Medical Disclaimer

This article is for general education and doesn’t replace personalized nutrition advice. Carbohydrate needs vary by activity, medication, and health status. If you have diabetes, kidney disease, are pregnant, or on medications like insulin or SGLT2 inhibitors, talk with a registered dietitian or your physician before switching to a low-carb or ketogenic pattern. Medically reviewed by Franco Cuevas, MD. Our nutrition team includes registered dietitians Brenda Peralta, Marita Radloff, and Kerly Cordova, and nutritionists Karolina Peterova and Guido Forti.