Leena Watts
The ketogenic diet is a low-carbohydrate, fat-rich eating plan that has been used for centuries to treat specific medical conditions. It involves restricting carb intake and replacing it with fats, putting the body into a state of ketosis. To stay in ketosis, a person can consume up to 50 grams of carbs per day, though this may vary between individuals. Many people on the keto diet count net carbs, which is the total carb intake minus the dietary fiber and certain sugar alcohols. Net carbs are said to be the amount of carbohydrates that are directly absorbed by the body and contribute calories.
| Characteristics | Values |
|---|---|
| Definition of net carbs | Net carbs are the total grams of carbohydrates minus grams of dietary fibre and certain sugar alcohols |
| Net carbs in ketogenic diet | 20-50 grams per day |
| Foods containing net carbs | Broccoli, raspberries, Brazil nuts, cashews, lentils, popcorn, oatmeal, Greek yogurt, etc. |
| Benefits | Weight loss, improved health parameters associated with excess weight (insulin resistance, high blood pressure, elevated cholesterol and triglycerides) |
| Risks | Restrictive, adverse effects on blood LDL cholesterol, unpleasant side effects |
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What You'll Learn
The definition of net carbs
"Net carbs" are the amount of carbohydrates that are absorbed by the body and used for energy. The term is often used in ketogenic and diabetic diets, and it refers to the number of carbohydrates that contribute calories.
To calculate net carbs, you take the total number of carbohydrates in a food product and subtract the amount of indigestible carbohydrates. Indigestible carbohydrates include insoluble fibres from whole grains, fruits, and vegetables, as well as sugar alcohols like mannitol, sorbitol, and xylitol, which are commonly found in sugar-free diabetic food products.
The concept of net carbs is based on the principle that not all carbohydrates affect the body in the same way. Some carbohydrates, like simple or refined starches and sugars, are rapidly absorbed and cause a quick rise in blood sugar levels. Other carbohydrates, like fibre, move slowly through the digestive system and are not digested, so they do not contribute to blood sugar spikes.
The calculation of net carbs can be confusing because the impact of sugar alcohols on blood sugar levels is not fully understood and can vary between individuals. Some sugar alcohols, such as erythritol, can be completely subtracted from the total carb count, while others, like maltitol, sorbitol, isomalt, and glycerin, count as about half a gram of carbs per gram.
For those following a ketogenic diet, the recommended daily carb intake is generally around 20 to 50 grams of net carbs. This can come from low-carb foods like broccoli, raspberries, Brazil nuts, or high-carb foods like cashews or lentils.
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How to calculate net carbs
The ketogenic diet involves eating a low number of carbohydrates and a high number of fats, with the aim of putting the body into a state of ketosis. To stay in ketosis, a person should consume no more than 50 grams of carbohydrates per day.
To calculate net carbs, you subtract the amount of indigestible carbohydrates from the total number of carbohydrates. Indigestible carbohydrates include insoluble fibres from whole grains, fruits, and vegetables, as well as sugar alcohols such as xylitol and erythritol. Fibre is not counted in the total number of carbohydrates because it is not digested by the human body.
Let's say a food product has 17.1 grams of total carbohydrates. It also contains 13.5 grams of fibre. To calculate the net carbs, you would subtract the fibre from the total carbohydrates:
1 grams total carbohydrates – 13.5 grams fibre = 3.6 grams net carbs.
It is important to note that the term "net carbs" is controversial within the low-carb community and among nutrition experts. The Food and Drug Administration (FDA) does not recognise the term and recommends using the total carbohydrates listed on nutrition labels. Additionally, sugar substitutes may not help with managing blood glucose or weight in the long run, so it is important to be mindful of that when calculating net carbs.
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Daily net carb intake
The ketogenic diet is a low-carbohydrate, fat-rich eating plan that has been used to treat specific medical conditions. The keto diet works by depriving the body of glucose, which is a convenient form of energy, and forcing it to burn fat instead. This fat is turned into a form of energy called ketone bodies, and the metabolic state in which the body is mostly running on ketones is called "ketosis".
The keto diet involves limiting daily net carb intake to 20-50 grams. This is calculated by subtracting the amount of fibre from the total number of carbs. Fibre is not counted in net carb totals because it is not digested by the human body. The exact number of grams of carbohydrates will differ for each person, depending on factors such as body weight, body fat percentage, fitness level, and baseline caloric needs.
The keto diet is very restrictive, and it is important to carefully plan meals to ensure that the body remains in ketosis. Net carbs are a term invented by food manufacturers as a marketing strategy, and they refer to the amount of carbohydrate that is directly absorbed by the body and contributes calories.
The standard ketogenic diet involves 70% fat, 20% protein, and 10% carbs. The high-protein ketogenic diet involves 60-65% fat, 30% protein, and 5-10% carbs. The cyclical ketogenic diet is a variation that allows total carbohydrate intake to vary each day, with two non-consecutive days of higher-carb intake, usually for athletic performance.
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Net carbs and ketosis
The ketogenic diet is a low-carbohydrate, fat-rich eating plan that has been used to treat specific medical conditions. It has gained attention as a potential weight-loss strategy. The diet restricts carbohydrate intake and replaces it with fats, putting the body into a state of ketosis. Ketosis is a metabolic state where the body uses fat for energy instead of carbohydrates. To stay in ketosis, a person can consume up to 50 grams of carbohydrates per day. However, the exact number of carbohydrates can vary between 20 to 50 grams per day, depending on the individual.
Many people on the keto diet count "net carbs" to stay in ketosis. Net carbs are calculated by subtracting the grams of dietary fibre and certain sugar alcohols from the total grams of carbohydrates in a given food. Net carbs refer to the amount of carbohydrate that is directly absorbed by the body and contributes calories. Fibre is not counted in net carb totals because it is not digested by the human body. Sugar alcohols, such as mannitol, sorbitol, and xylitol, are also not fully digested and may impact ketone levels.
There is some debate within the ketogenic diet community about the value of using net carbs. While net carbs can be a helpful way to track carbohydrate intake, some people find that focusing solely on net carbs can lead to a diet of highly processed "keto junk food". It is important to note that the keto diet is already very restrictive, and it can be challenging to maintain. Therefore, it is recommended to consult with a physician and dietitian before starting the keto diet to ensure it is tailored to individual needs and health conditions.
Counting net carbs can be a useful tool for those on the keto diet to ensure they stay in ketosis. However, it is important to be mindful of the types of foods consumed and not rely solely on net carb counts, as this may impact the overall nutritional quality of the diet.
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Net carbs vs. total carbs
The ketogenic or "keto" diet is a low-carbohydrate, fat-rich eating plan that has been used to treat specific medical conditions. The keto diet typically restricts net carbohydrate intake to around 20 to 50 grams per day. Many people on a keto diet count "net carbs" instead of total carbs.
Net carbs are calculated by taking the total number of carbohydrates in a product and subtracting the number of grams of fibre and sugar alcohols. This is because fibre and sugar alcohols are thought to have a minimal impact on blood sugar levels and are not digested by the body. The resulting number of net carbs is the amount of carbohydrates that are directly absorbed by the body and contribute calories.
However, it is important to note that the term "net carbs" does not have a legal definition and is not used by the Food and Drug Administration (FDA) or recognised by the American Diabetes Association. The FDA recommends using total carbohydrates on nutrition facts labels. The equation used to calculate net carbs is not entirely accurate because the contribution of fibre and sugar alcohols to total carbohydrates depends on the types present.
While counting net carbs may be a useful tool for those on the keto diet, it is important to consult with a healthcare professional before starting any new diet, especially one that restricts entire food groups, like carbohydrates. Additionally, those on the keto diet should aim to consume carbohydrates from whole, unprocessed foods to benefit from their vitamins and minerals.
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Frequently asked questions
Net carbs are the total grams of carbohydrates in a given food minus its grams of dietary fibre and certain sugar alcohols. Net carbs are also referred to as impact carbs.
The general consensus is that you should consume 20 or fewer grams of net carbs per day to stay in ketosis. However, some sources suggest a range of 20 to 50 grams per day.
To calculate net carbs, subtract the grams of dietary fibre and sugar alcohols from the total grams of carbohydrates in a given food.
The keto diet aims to keep the body in a state of ketosis, where it burns fat for energy instead of carbohydrates. Counting net carbs helps individuals stay in ketosis by tracking their daily carbohydrate intake.
Broccoli, raspberries, Brazil nuts, and other whole, unprocessed foods are good sources of low-net carbs. It is important to note that the serving size also matters, as a small serving may still contain a significant portion of your daily net carb allowance.
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