
Dr. Eric Berg is a chiropractor and keto expert who has authored several books on health and weight loss. According to Dr. Berg, the keto diet is a low-carb, low-sugar diet that triggers a metabolic state known as ketosis, where the body burns fat for fuel instead of glucose. While fruits are rich in essential nutrients, most contain too many carbohydrates and can quickly interfere with fat burning, making them unsuitable for a ketogenic lifestyle. Apples, in particular, have a high sugar content, with a medium apple containing around 19 grams of sugar, which is too much for a standard keto diet. Dr. Berg recommends avoiding apples until you reach your ideal weight, as their sugar content can stop fat burning for up to two days. However, some apple products, such as apple cider vinegar, are acceptable on the keto diet and may even help regulate blood sugar levels.
| Characteristics | Values |
|---|---|
| Carbohydrates | 25g |
| Fiber | 44g |
| Sugar | 19g |
| Glycemic index | High |
| Carb intake | 28g |
| Keto-friendly | No |
| Nutritional benefits | Yes |
| Weight loss benefits | No |
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What You'll Learn
- Apples are high in carbohydrates and sugar, with a medium apple containing around 19 grams
- Apples can stop fat burning for 1-2 days, so they are not recommended until you reach your ideal weight
- Apples are a good source of vitamin C and fibre, supporting digestion and promoting a diverse microbiome
- The Honeycrisp apple contains excessive amounts of sugar compared to traditional apples
- Apple cider vinegar is acceptable on the keto diet and may help regulate blood sugar levels

Apples are high in carbohydrates and sugar, with a medium apple containing around 19 grams
Apples are a contentious food when it comes to the keto diet. While they are a good source of vitamin C and fibre, which aids digestion and promotes a diverse microbiome, they are also high in carbohydrates and sugar. A medium apple contains around 19 grams of sugar and 25 grams of carbohydrates. This can be too many carbs for a standard keto diet, potentially interfering with ketosis and fat burning.
The high sugar content in apples can cause an insulin spike, which temporarily stops the body from burning fat. This is a key consideration for anyone on a keto diet, as ketosis is a metabolic state where the body burns fat instead of glucose from carbohydrates.
Some apple products, such as apple cider vinegar, are acceptable on the keto diet and may even help regulate blood sugar levels. However, the sugar content in apples can vary depending on the variety. Modern apple varieties, such as the Honeycrisp, have been cultivated to have higher sugar content, making them even less suitable for a keto diet.
While apples can be a convenient and healthy snack for some, they may not be the best choice for those following a keto diet due to their relatively high carbohydrate and sugar content. It is important to consider the potential impact on ketosis and fat burning when deciding whether to include apples in a keto diet.
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Apples can stop fat burning for 1-2 days, so they are not recommended until you reach your ideal weight
Dr. Eric Berg, a chiropractor who specializes in healthy ketosis and intermittent fasting, advises against consuming apples or any fruit until one reaches their ideal weight. Apples have a high enough sugar content to stop fat burning for at least one to two days. This is because the presence of insulin in the body, which is triggered by the consumption of sugar, inhibits fat burning.
The keto diet is a low-carb, low-sugar diet that triggers a metabolic state known as ketosis, where the body burns fat for fuel instead of glucose from carbohydrates. Maintaining a low-carb diet is essential to achieving and sustaining ketosis. Most fruits are naturally sweet due to their fructose, glucose, and sucrose content, and while these are natural sugars, they still impact blood sugar levels.
Apples, in particular, have been cultivated to have higher sugar content to appeal to consumers. The Honeycrisp apple, for example, contains excessive amounts of sugar compared to traditional apples. A medium apple has around 19 grams of sugar and 25 grams of total carbohydrates, which is too much for a standard keto diet.
While fruit contains essential nutrients, it is vital to consume them strategically on keto. Fruits high in sugar can negatively impact weight loss progress. Low-carb fruits such as berries, avocados, and tart citrus fruits like limes and lemons are better options on a keto diet as they can be consumed in moderation without disrupting ketosis.
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Apples are a good source of vitamin C and fibre, supporting digestion and promoting a diverse microbiome
Apples are a good source of vitamin C, fibre, and various antioxidants. Vitamin C, also known as ascorbic acid, is an essential dietary nutrient with many important functions in the body. Apples are also rich in simple sugars, such as fructose, sucrose, and glucose, and have a low to moderate glycemic index (GI) ranging from 42 to 44. The fibre in apples helps to moderate blood sugar levels and promote gut health.
Apples are considered a nutrient-dense fruit, providing a lot of nutrients per serving. They are filling, considering their low-calorie count, and are often recommended as a healthy snack or dessert. The high fibre content of apples contributes to their weight-loss-friendly properties, as fibre helps to slow down sugar absorption and moderate blood sugar levels.
In addition to their health benefits, apples are also versatile in the kitchen. They can be eaten raw, cooked into various recipes, or used in juices and drinks. The different types of apples, ranging from sweet red varieties like Red Delicious to tangy green ones like Granny Smith, offer a range of flavours and colours to suit different tastes and culinary applications.
While apples are generally healthy, they may not be the best choice for a keto diet due to their carbohydrate content. A medium apple contains around 19 grams of sugar and 25 grams of total carbohydrates per serving, which may be too many carbs for a standard keto diet. However, small amounts of low-sugar fruits like berries can be consumed on keto in moderation without disrupting ketosis.
Despite this, apples do offer some specific benefits that promote a diverse microbiome. The fibre in apples, particularly pectin, reaches the colon intact and promotes the growth of good bacteria. It improves the ratio of Bacteroidetes to Firmicutes, the two main types of bacteria in the gut. Additionally, the polyphenols and other antioxidants in apples may help protect against chronic diseases by reducing the abundance of human pathogens in the gut.
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The Honeycrisp apple contains excessive amounts of sugar compared to traditional apples
The keto diet is a low-carb, low-sugar diet that triggers a metabolic state known as ketosis. During ketosis, the body begins burning fat for fuel instead of glucose from carbohydrates. Maintaining a low-carb intake is essential to achieving and sustaining ketosis.
Fruits contain essential nutrients, but they also contain carbohydrates and sugar, which can negatively impact ketosis and fat burning. While some fruits can be enjoyed in moderation on a keto diet, others are too high in sugar and carbohydrates and should be avoided. Apples, for example, are a good source of vitamin C and fiber, but they are also high in carbohydrates and sugar. A medium apple contains around 19 grams of sugar and 25 grams of total carbohydrates, which is too much for a standard keto diet.
Some apple varieties have been cultivated to have higher sugar content than others. The Honeycrisp apple, for instance, contains excessive amounts of sugar compared to traditional apples. Honeycrisp apples were first introduced in the 1990s and are a hybrid of Keepsake apples and Northern Spy apples. They are known for their amazing flavor, incredible crunch, and overall popularity, making them generally more expensive than other apple varieties. While a medium Honeycrisp apple contains only 70 calories, it has 17 grams of total carbohydrates and 13 grams of total sugars.
Therefore, while apples can be enjoyed in moderation on a keto diet, the Honeycrisp variety should be consumed with caution due to its higher sugar content compared to traditional apples.
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Apple cider vinegar is acceptable on the keto diet and may help regulate blood sugar levels
The keto diet is a low-carb, low-sugar diet that triggers a metabolic state known as ketosis. During ketosis, the body begins burning fat for fuel instead of glucose from carbohydrates. Maintaining a low-carb diet is essential to achieving and sustaining ketosis.
Apples are a good source of vitamin C and fiber, but many modern varieties have been cultivated to have higher sugar content. For example, the Honeycrisp apple contains excessive amounts of sugar compared to traditional apples. A medium apple has around 19 grams of sugar and about 25 grams of total carbs per serving, which is too much for a standard keto diet.
However, some apple products, such as apple cider vinegar (ACV), are acceptable on the keto diet. ACV contains minimal carbohydrates, with just 1 gram of carbs per tablespoon (15 mL), making it keto-friendly. Additionally, ACV has been praised for its potential health benefits, including improving diabetes and lowering blood sugar levels.
Research has shown that apple cider vinegar can help balance the blood sugar response when consumed strategically around mealtimes. For example, it has been found to reduce the glycemic index of a carbohydrate-rich meal like white bread. Results from a small study in people with type 2 diabetes also suggest that consuming ACV with a high-protein, very-low-carb snack before bed may improve fasting blood sugar levels.
While ACV is keto-friendly, it's important to note that other vinegars, such as white vinegar and rice vinegar, are completely carb-free and may be a better fit for keto dieters. It's also crucial to consume ACV safely by diluting it with water and limiting intake to a maximum of 2 tablespoons per day to prevent potential damage to teeth and the digestive tract.
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Frequently asked questions
Apples have a high glycemic index and contain around 19 grams of sugar, which is too much for a keto diet. Therefore, apples are not recommended on the ketogenic diet.
Fruits with low sugar and low-carbohydrate content such as berries, avocados, limes, and lemons are suitable for a keto diet and can be consumed in moderation.
The keto diet is a low-carb, low-sugar diet that triggers a metabolic state known as ketosis by focusing on healthy fats and moderate amounts of protein.











































