
The keto diet is a high-fat, low-carb diet that aims to put the body in a state of ketosis, where it uses fat instead of carbohydrates for energy. Most fruits are high in fructose and are not recommended on the ketogenic diet. However, watermelon is a low-calorie fruit that is relatively low in carbs compared to other fruits. So, can you eat watermelon on a keto diet? The short answer is yes, but in moderation.
| Characteristics | Values |
|---|---|
| Carbohydrates | 1 cup of diced watermelon contains 11-11.5 grams of carbohydrates |
| Fibre | 0.5-0.6 grams of fibre |
| Sugar | 9 grams of sugar |
| Calories | 46 calories |
| Vitamins | Vitamin C, Vitamin A |
| Minerals | Potassium, Copper, Electrolytes |
| Antioxidants | Vitamin C, Lycopene |
| Glycemic Index | High (72) |
| Glycemic Load | Low (5 per 120-gram serving) |
| Recommended Daily Intake | No more than half a cup per day |
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What You'll Learn

Watermelon is a low-calorie treat with health benefits
Watermelon is a delicious low-calorie treat with numerous health benefits. It is rich in vitamins and minerals, including vitamin C, lycopene, potassium, and copper. Vitamin C is an immune-boosting nutrient, while lycopene is a plant nutrient that gives watermelon its pink colour and is beneficial for fighting inflammation and diseases such as cancer, heart disease, and diabetes. Potassium supports heart health, and watermelon also contains citrulline, an amino acid that can increase blood flow to the muscles.
Watermelon is also a good source of hydration, with a 92% water content by weight, which is higher than any other fruit. This can help to prevent dehydration, a common side effect of the keto diet due to increased urine production when ketone levels are high.
Watermelon is relatively low in carbohydrates compared to other fruits, with about 11 grams of net carbs per cup of diced watermelon. This makes it a good choice for those on a ketogenic diet, which typically restricts carbohydrate intake to a maximum of 50 grams per day, with some sources recommending only 25 grams per day. However, it is important to consume watermelon in moderation as part of a keto diet, as it may require careful planning and reduced portion sizes to stick within the daily carb allotment.
In addition to watermelon, other low-carb fruits that can be enjoyed on a ketogenic diet include avocados, berries, cantaloupe, and raspberries. These fruits can provide important nutrients while keeping carb intake low, which is crucial for maintaining ketosis and achieving the desired effects of the keto diet.
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It can be eaten on keto in moderation
Watermelon is a delicious and nutritious fruit that can be enjoyed as a treat, and it can be eaten on a keto diet in moderation. The keto diet is a high-fat, low-carb diet that aims to put the body in a state of ketosis, where it uses fat instead of carbohydrates for energy. This often means that fruits, which are naturally high in carbs, are off the menu. However, compared to other fruits, watermelon is relatively low in carbs.
A cup of diced watermelon contains approximately 11 grams of carbohydrates, including 0.5 to 0.6 grams of fibre and nine grams of sugar. This means that it has about 11 grams of net carbs. Net carbs are the total grams of carbs minus the grams of fibre. On the keto diet, your total carb intake should be between 20 and 50 net carbs per day, so a cup of watermelon is a significant contribution to this allowance.
Watermelon is also a good source of hydration, vitamins, and minerals. It has a high water content, at 92% water by weight, which can help to combat the dehydration that is a common side effect of the keto diet. It is also a source of immune-boosting vitamin C, and it's one of the best food sources of citrulline, an amino acid that can be converted into nitric oxide in the body. Nitric oxide can help increase blood flow to the muscles and other parts of the body.
To include watermelon in your keto diet, it is important to limit the amount you eat. Eating too much watermelon will kick you out of ketosis and reduce the health benefits of the keto diet. It is recommended to limit your intake to no more than half a cup per day, and to only consume watermelon during a meal, not when fasting. You should also consider how the carbs in watermelon fit into your total carb intake for the day.
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It's high in water content and nutrients
Watermelon is a delicious low-calorie treat with numerous health benefits. It is rich in water content and essential nutrients, making it a refreshing and nourishing choice, especially during the warmer months.
With a water content of 92% by weight, watermelon is an excellent way to stay hydrated, which is crucial as dehydration is a common side effect of the keto diet. Its high-water concentration can help prevent dehydration and support overall fluid intake, keeping the body cool and functioning optimally.
Watermelon is also an excellent source of vitamins and minerals, offering a range of health benefits. It provides immune-boosting vitamin C, which helps to strengthen the body's defences and protect against various ailments. Additionally, watermelon is a good source of citrulline, an amino acid that the body can convert into nitric oxide. Nitric oxide plays a role in increasing blood flow to muscles and other parts of the body, promoting healthy circulation.
Moreover, watermelon contains lycopene, a plant nutrient responsible for its pink colour. Lycopene is a powerful antioxidant that helps fight inflammation and reduce the risk of chronic diseases such as cancer, heart disease, and diabetes. The fruit is also a source of potassium, which supports heart health, and other electrolytes, which are essential for maintaining fluid balance and proper bodily functions.
In summary, watermelon's high water content and nutrient profile make it a hydrating and nourishing choice for individuals on a keto diet. Its combination of vitamins, minerals, and antioxidants offers a range of health benefits, including improved hydration, enhanced immune function, increased blood flow, and reduced inflammation. However, it is important to consume watermelon in moderation as part of a well-planned keto diet to ensure it fits within daily carb intake limits.
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It's a good source of citrulline, an amino acid
Watermelon is a good source of citrulline, a non-essential amino acid that is converted into another amino acid, arginine, in your body. Both citrulline and arginine aid nitric oxide production. Nitric oxide is a gas molecule that causes the tiny muscles around your blood vessels to relax and dilate, leading to reduced blood pressure.
Research has shown that watermelon consumption increases plasma arginine concentrations in adults. Supplementing with watermelon or its juice may reduce blood pressure and arterial stiffness in people with high blood pressure. One study found that watermelon juice enriched with L-citrulline and pomegranate ellagitannins enhanced metabolism during physical exercise. Another study found that longer-term watermelon consumption improved pulse wave velocity, indicating improved vascular function.
Watermelon is also a good source of lycopene, a plant nutrient that gives watermelon its pink hue. Lycopene is beneficial for fighting inflammation and diseases such as cancer, heart disease, and diabetes.
While watermelon is a good source of citrulline, it is important to note that it also contains relatively high amounts of fructose, a type of FODMAP that some people do not fully digest. Individuals who are sensitive to FODMAPs, such as those with irritable bowel syndrome (IBS), may experience unpleasant digestive symptoms such as bloating, gas, and stomach cramps after consuming watermelon.
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It's a low-carb fruit compared to others
The keto diet is a high-fat, low-carb diet that was originally designed for epilepsy patients but has become popular for weight loss. The goal of the ketogenic diet is to use healthy fats as the body's energy source. By depleting the body's sugar reserves, the diet puts the body in a state of ketosis, where the body uses stored fat as fuel.
Watermelon is a low-carb fruit compared to other fruits and can be enjoyed as part of a ketogenic diet. One cup of diced watermelon contains approximately 11 grams of carbohydrates, including 0.5 to 0.6 grams of fiber and nine grams of sugar. It is also high in water content, with a 92% water weight, and provides hydration and an array of vitamins and minerals, including vitamin C, potassium, copper, and antioxidants.
However, careful planning is required to include watermelon in a keto diet. The keto diet is highly restrictive, and a single serving of watermelon could take up nearly half of the daily carb allotment, which is between 20 and 50 grams of net carbs per day. Therefore, portion sizes must be considered to keep the carb count in check. It is recommended to not consume more than half a cup of watermelon per day to stay within the daily carb intake limit and avoid being kicked out of ketosis.
Other low-carb fruits that can be included in a keto diet are avocados, berries, cantaloupe, and star fruit. These fruits provide a healthy dose of fat and fiber, making them keto-friendly choices.
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Frequently asked questions
Yes, watermelon is keto-friendly, but only in small amounts. It is relatively low in carbs compared to other fruits, with one cup of diced watermelon containing about 11 grams of net carbs. However, careful planning and reduced portion sizes are necessary to stay within your daily carb allotment.
It is recommended to limit your watermelon intake to no more than half a cup per day on a keto diet. Eating larger amounts can kick you out of ketosis and reduce the health benefits of the keto diet.
Watermelon is a good choice on the keto diet because it has a low glycemic load, provides hydration, and offers an array of vitamins and minerals, including vitamin C, lycopene, and potassium. It also contains citrulline, an amino acid that can increase blood flow to the muscles.











































