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Are Bananas Keto-Friendly?

Bananas on a kitchen counter

Are Bananas Keto-Friendly? The quick answer is no, due to their high carb content.

But just because bananas and the ketogenic diet don't make the best match doesn't mean we're leaving it at that.

In this article, we're going to delve into the nitty-gritty of why bananas don't fit into a keto diet and how you can satisfy your banana cravings in a keto-friendly way.

We'll do a full breakdown of the carb content in bananas, and discuss how this might affect your state of ketosis.

Beyond this, we are going to explore some keto-compatible alternatives for bananas and how they can be used in various recipes.

Understanding the nutritional profile of our foods is a crucial part of any diet, and that's precisely what we are going to do with bananas here.


  • Are bananas keto-friendly? Not really, due to their high carb content. But it's not all black and white - there's more to the story.
  • Bananas are packed with carbs - about 20.24g net carbs per 100g. Not exactly the low-carb snack you're looking for on a keto diet.
  • The high carb and sugar content in bananas can disrupt ketosis and lead to blood sugar spikes. Not ideal if you're trying to maintain a state of ketosis.

Are Bananas Keto-Friendly?

Bananas, while a popular and nutritious fruit, do not align well with the ketogenic diet. A ketogenic diet typically restricts carb intake to around 20 to 50 grams per day to promote the body's shift into ketosis, a metabolic state where fat, instead of carbs, is used for energy.

Given this, bananas do not fit comfortably into the carb limit of a ketogenic lifestyle. For every 100 grams, bananas contain 20.24 grams of net carbohydrates. This high carb content, relative to the recommended daily carb intake of a keto dieter, means that bananas can easily push one out of ketosis.

To put it into perspective, a medium-sized banana, which typically weighs around 100 grams, has 20.24 grams of net carbs. Most people following a ketogenic diet aim to consume below 50g of net carbs per day, and sometimes as low as 20g. Consuming just one banana could occupy a significant portion, if not all, of a person's daily carb allotment on keto. This restricts their ability to incorporate a wider variety of nutrient-rich foods within their daily carb limit.

Can You Have Bananas On a Strict Keto Diet?

In the context of a strict ketogenic diet, which often caps daily carb intake at around 20 grams, incorporating bananas becomes challenging. With 20.24 grams of net carbs per 100 grams, even a single banana could exceed this entire carb allotment, potentially disrupting the state of ketosis.

Even for individuals practicing a less rigid form of the keto diet or a low-carb diet, where the daily net carb intake is allowed up to 30-50 grams, bananas remain a problematic choice. Consuming a banana under these conditions could still use up a significant portion of the daily carb allowance, leaving little room for other nutrient-rich foods.

Carbs In Bananas

Bananas are rich in carbohydrates, with a substantial portion of their nutritional content coming from carbs. For every 100 grams of banana, you are looking at 20.24 grams of net carbs. This is significant when you consider that a medium-sized banana, which typically weighs around 100 grams, would provide this entire amount.

Net carbs, which matter most on a ketogenic diet, are calculated by subtracting the grams of fiber from the total grams of carbohydrates. This is because fiber is a type of carbohydrate that the body cannot digest, and therefore does not contribute to raising blood sugar levels or disrupting ketosis.

Another important factor to consider is the glycemic index (GI), a measurement of how quickly a food causes blood glucose levels to rise. Foods with a high GI are rapidly digested and absorbed, leading to a more immediate and significant impact on blood sugar levels. By contrast, low-GI foods are digested and absorbed at a slower rate, leading to a gradual rise in blood sugar levels. Bananas have a moderate glycemic index, which means they can cause a moderate rise in blood glucose levels, another reason why they might not fit well into a ketogenic diet.

Bananas Nutrition Facts

A 100g serving of bananas packs a wide range of nutrients. With 89 calories, most of the energy comes from 22.84g of carbohydrates, including 20.24g of net carbs and 2.6g of dietary fiber. Their protein content is relatively low at 1.09g, and they contain a minimal amount of fat, only about 0.33g.

Bananas are a source of various vitamins and minerals. They are rich in potassium, with 358mg in a 100g serving. This mineral is crucial for heart health and normal cellular function. They also provide 27mg of magnesium, another essential mineral for heart and muscle function, as well as nerve signaling.

The vitamin content is also noteworthy. Bananas contain 8.7mg of vitamin C, known for its antioxidant properties. They also provide 0.37mg of vitamin B-6, which is crucial for brain development and function. Other vitamins present include vitamin A, vitamin E, vitamin K1, and several B-vitamins such as Thiamin, Riboflavin, and Niacin.

As for trace elements, bananas contain small amounts of iron, copper, manganese, and zinc, all of which are essential for bodily functions. They also provide small quantities of selenium and fluoride.

The amino acid profile of bananas includes tryptophan, threonine, isoleucine, leucine, lysine, and others. There are also small amounts of saturated, monounsaturated, and polyunsaturated fatty acids.

Nutrient NameAmount and Unit per 100g
Net Carbs 20.24g
Carbohydrate, by difference 22.84g
Fiber, total dietary 2.6g
Total fats 0.33g
Protein 1.09g
Sodium, Na 1.0mg
Potassium, K 358.0mg
Magnesium, Mg 27.0mg
Calcium, Ca 5.0mg
Vitamin A 3.0ug
Vitamin B-6 0.37mg
Vitamin C, total ascorbic acid 8.7mg
Vitamin E (alpha-tocopherol) 0.1mg
Vitamin K1 0.5ug
Copper, Cu 0.08mg
Iron, Fe 0.26mg
Phosphorus, P 22.0mg
Selenium, Se 1.0ug
Zinc, Zn 0.15mg
Fluoride, F 2.2ug
Beta-carotene 26.0ug
Lutein + zeaxanthin 22.0ug
Betaine 0.1mg
Manganese, Mn 0.27mg
Thiamin 0.03mg
Riboflavin 0.07mg
Niacin 0.66mg
Pantothenic acid 0.33mg
Folate, total 20.0ug
Choline, total 9.8mg
Calories 89.0kcal
Water 74.91g
Tryptophan 0.01g
Threonine 0.03g
Isoleucine 0.03g
Leucine 0.07g
Lysine 0.05g
Methionine 0.01g
Cystine 0.01g
Phenylalanine 0.05g
Tyrosine 0.01g
Valine 0.05g
Arginine 0.05g
Histidine 0.08g
Alanine 0.04g
Aspartic acid 0.12g
Glutamic acid 0.15g
Glycine 0.04g
Proline 0.03g
Serine 0.04g
Fatty acids, total saturated 0.11g
Fatty acids, total monounsaturated 0.03g
Fatty acids, total polyunsaturated 0.07g
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 Bananas on a Keto Diet

Including bananas on a ketogenic diet poses challenges due to their high carb content, which can make maintaining a state of ketosis difficult. However, it's important to recognize that bananas are packed with valuable nutrients that can contribute to overall health.

Bananas are rich in several vitamins and minerals, particularly vitamin C, vitamin B6, and potassium. Vitamin C is crucial for growth and repair of tissues in the body, and it's a powerful antioxidant. Vitamin B6 plays a key role in brain development and function, and it's involved in creating neurotransmitters like serotonin and norepinephrine. Potassium is an essential nutrient that helps regulate heart function, blood pressure, and nerve signals.

On the flip side, bananas do contain relatively high amounts of sugar, with around 17.2g per 100g. This, coupled with their high carb content, could lead to spikes in blood sugar levels, especially problematic for individuals with insulin resistance or diabetes.

Keto-Compatible Alternatives for Bananas

While bananas may not be a keto-friendly fruit, several alternatives can fit well into a ketogenic diet. Here are a few options:

  1. Berries: Raspberries, blackberries, and strawberries are lower in carbs compared to bananas and can serve as a flavorful alternative. These berries can be incorporated into keto-friendly desserts or used as a topping for keto pancakes.
  2. Avocados: Although not sweet, avocados offer a creamy texture similar to bananas. They are also high in healthy fats and low in carbs, making them a great option for making keto-friendly smoothies or mousse.
  3. Zucchini: For baking needs, zucchini can be a suitable swap. It's low in carbs and offers a soft texture when baked, perfect for making keto bread or muffins.
  4. Pumpkin: Pumpkin is another low-carb alternative that can be used in place of bananas. It can be used in a variety of keto recipes, including smoothies, pies, and pancakes.

Concluding Thoughts on Bananas and Keto

Throughout our discussion, it's clear that while bananas are a nutrient-rich fruit, they do not align well with the principles of a ketogenic diet due to their high net carb content. Consuming a banana could easily exceed the daily carb allotment on a ketogenic diet, which could disrupt ketosis.

Despite their nutritional qualities, such as being a good source of vitamins C and B6, and potassium, their high sugar content could lead to blood sugar spikes. This is especially relevant for people with insulin resistance or diabetes.

There are, however, plenty of tasty and nutritious alternatives to bananas for those following a ketogenic diet. From berries to avocados, zucchini, and pumpkin, there's no shortage of options to experiment with in your low-carb recipes.

Explore our Is It Keto Knowledge Hub.

Are Fruits Keto-Friendly

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

Unfortunately, bananas do not pair well with a keto diet due to their high carb content.

There are about 20.24g net carbs per 100g of bananas.

Yes, due to their high carb and sugar content, bananas can disrupt the state of ketosis.