The keto diet is a very low-carb, high-fat diet that aims to put the body into a state of ketosis, where it burns fat for energy instead of carbohydrates. To achieve and maintain ketosis, it is important to restrict carbohydrate intake, and this is typically done by counting net carbs. Net carbs are calculated by subtracting the grams of dietary fibre and certain sugar alcohols from the total grams of carbohydrates in a food item. This calculation is important because dietary fibre is not digested by the body and therefore does not impact blood sugar levels in the same way as other carbohydrates. Counting net carbs allows for greater consumption of vegetables and other wholesome foods while still maintaining ketosis. Most keto diets recommend limiting net carbs to between 20 and 50 grams per day.
What You'll Learn
- Net carbs are calculated by subtracting fibre and certain sugar alcohols from total carbs
- Total carbs are the sum of all the carbs you eat in a day
- Net carbs are absorbed into the body, while some carbs like fibre and sugar alcohols are not
- On keto, you can consume up to 50 grams of net carbs per day
- Net carbs are what matter when it comes to keto
Net carbs are calculated by subtracting fibre and certain sugar alcohols from total carbs
Net carbs refer to the total amount of digestible carbohydrates in a food product or meal. They are calculated by subtracting fibre and certain sugar alcohols from the total number of carbohydrates.
The body is able to absorb net carbs, also known as digestible carbs. To calculate the number of net carbs in a serving, subtract the fibre content from the number of total carbs. If the food is processed, you should also subtract half the sugar alcohol content. These quantities are available on food labels.
Fibre is a type of carbohydrate that the body cannot digest and so cannot transform into glucose for energy. The amount of fibre is included in the number of total carbs, but not in the number of net carbs.
Sugar alcohols are used to add sweetness to many low-carb foods. The body processes sugar alcohols similarly to fibre, but not all sugar alcohols are created equal. Erythritol, for example, is a sugar alcohol that is naturally found in fruit and some fermented foods. It has a minimal impact on blood glucose and ketone levels because most of it passes into the urine without being metabolised. Because of this, you can subtract the total value of erythritol when calculating net carbs.
However, other sugar alcohols like maltitol, sorbitol, isomalt, and glycerin do affect your blood sugar and are partially digested by your body. Because of this, most experts recommend dividing their total number in half and then subtracting that number from the total carbohydrates.
Calculating net carbs in whole foods is simple. Whole foods contain naturally occurring fibre. Therefore, you can simply subtract the fibre from the total carbs to get the net carbs. For example, a medium avocado contains 17.1 grams of total carbs, 13.5 grams of which is fibre. So 17.1 grams of total carbs minus 13.5 grams of fibre equals 3.6 grams of net carbs.
Calculating net carbs in processed foods is a little more complicated. To calculate the net carbs in a packaged product, the more information you have, the better. Generally speaking, half of the carbs from sugar alcohols can be subtracted from the total carbs listed on the nutrition label. Erythritol is an exception. If it’s the only sugar alcohol in the ingredients list, its carbs can be completely subtracted from the total carbs.
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Total carbs are the sum of all the carbs you eat in a day
Total carbs are the sum of all the carbohydrates you consume in a day. They include starches, dietary fibre, and sugars.
The keto diet is a low-carb, high-fat diet that aims to put the body into a state of ketosis, where it burns fat instead of carbs for energy. To stay in ketosis, a person can consume up to 50 grams of net carbs per day. However, some sources suggest limiting intake to 20 grams of total carbs per day.
Total carbs are calculated by counting the total grams of carbohydrates in all food consumed in one day. This includes all types of carbs, regardless of whether they are fully digestible or not.
Net carbs, on the other hand, are calculated by taking the total carbs and subtracting the fibre and certain sugar alcohols that are not absorbed by the body. Net carbs refer to the total amount of digestible carbohydrates in a food product or meal.
The calculation for net carbs is: Net carbohydrates = total carbohydrates – fibre – erythritol (if applicable).
For example, if a food contains 20 grams of total carbs and 10 grams of dietary fibre, it has 10 grams of net carbs.
While total carbs give the overall sum of carbohydrates consumed, net carbs provide a more precise measure of the carbs that are actually absorbed and utilised by the body.
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Net carbs are absorbed into the body, while some carbs like fibre and sugar alcohols are not
Net carbs are those that are absorbed by the body and include both simple and complex carbs. Simple carbs are found in fruits, vegetables, milk, sugar, honey and syrup, while complex carbs are found in grains and starchy vegetables like potatoes. When you eat a carb-containing food, most of the carbs are broken down into individual sugar units by enzymes produced in your small intestine. Your body can only absorb these individual sugar units.
However, some carbs, like fibre and sugar alcohols, are not absorbed into the body. Fibre is a unique form of carbohydrate in terms of its digestion and effects on the body. Unlike starch and sugar, fibre isn't absorbed in the small intestine because the links between its sugar units can't be broken down by digestive tract enzymes. Instead, it passes directly into the colon.
Sugar alcohols are processed similarly to fibre. Many are only partially absorbed in the small intestine, and there is a lot of variation among different types. Researchers report that the small intestine absorbs 2-90% of sugar alcohols. However, some are only briefly absorbed into the bloodstream and then excreted in urine. Sugar alcohols don't seem to have a major effect on blood sugar and insulin levels, but individual responses may vary, especially for those with diabetes or prediabetes.
The calculation for net carbs is: Net carbohydrates = total carbohydrates – fibre – erythritol (if applicable).
While the Food and Drug Administration (FDA) does not recognise the term "net carbs", counting net carbs can be beneficial for some people. For example, it can help promote a healthy intake of dietary fibre, which can increase feelings of fullness and help control blood sugar levels. It can also increase the number of food choices available, as many fruits and vegetables are rich in fibre and contribute fewer carbs to a person's daily goal.
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On keto, you can consume up to 50 grams of net carbs per day
The keto diet is a low-carb, high-fat diet that aims to put the body into a state of ketosis, where it burns fat for energy instead of carbohydrates. To stay in ketosis, a person can consume up to 50 grams of net carbs per day, and the lower, the better. This amount may vary between individuals, and those with more active lifestyles may be able to consume more carbs on training days.
Net carbs are the total grams of carbohydrates in a food minus its grams of dietary fibre and certain sugar alcohols. Dietary fibre is not broken down and absorbed by the digestive tract; instead, it passes through the system until it reaches the colon, where it is fermented by bacteria or eliminated in faeces. Sugar alcohols, such as erythritol, are only partially digested and absorbed, and they may raise blood glucose and lower ketone levels.
To calculate the number of net carbs in a food, you can subtract the amount of dietary fibre and half the amount of sugar alcohols from the total number of carbohydrates. This information can be found on food labels.
Some people on keto count total carbs, especially if they are on the keto carnivore diet or using keto for therapeutic reasons. Total carbs are the sum of all the carbs eaten in a day.
How to Stay in Ketosis
The ketogenic diet is very restrictive, and it can be challenging to stay in ketosis. It may be helpful to ease into the diet gradually, for example, by cutting out one type of high-carb food at a time. It is also important to consume carbs from whole, unprocessed foods to benefit from their vitamins and minerals.
Keto-Friendly Foods
Meats such as beef, veal, lamb, pork, chicken, and turkey, and fish such as cod, sardines, tuna, and salmon have very low net carbs. Most green and leafy vegetables also have a low keto net carb count and can be enjoyed freely. High-fibre, low-fructose fruits can also be included in a keto diet plan. Cheese tends to be low in carbs and high in fat, making it a good choice for keto diets.
Tips for Keto Beginners
If you are new to keto, you can start with an upper limit of 50 grams of net carbs per day and stay at that level for weeks instead of drastically cutting out carbs. This approach may help reduce the unpleasant symptoms of the "keto flu," which can occur in the first few days of carb restriction.
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Net carbs are what matter when it comes to keto
The keto diet is a very low-carb, high-fat diet that puts your body into a state of ketosis, where fat is burned for energy instead of carbohydrates. To stay in ketosis, it's important to count your "net carbs" rather than your "total carbs". Net carbs are the number of carbohydrates that are absorbed into your body.
The total carbohydrates listed on a food label include sugar, fiber, and sometimes sugar alcohols. Net carbs are calculated by subtracting the number of grams of fiber and certain sugar alcohols from the total number of carbohydrates. For example, if a food has 37 grams of total carbohydrates and 4 grams of fiber, the net carb count would be 33 grams. Net carbs = total carbs – fiber.
Fiber is a type of carbohydrate that the body cannot digest, so it doesn't count towards the amount of carbs that can trigger an insulin response. Insulin responses can prevent your body from going into ketosis. Sugar alcohols like xylitol and erythritol are also not counted towards net carbs because they pass through the digestive tract undigested and don't impact blood sugar levels.
When following the keto diet, it's important to stay within your daily allowance of net carbs, which is typically between 20 to 50 grams per day. Counting net carbs instead of total carbs allows for greater consumption of vegetables and other wholesome foods while still maintaining ketosis.
To calculate the net carbs in a serving of food, simply subtract the amount of dietary fiber and half the amount of sugar alcohols (if any) from the total number of carbohydrates. This information can be found on food labels or nutrition facts online. For example, if a food has 20 grams of total carbohydrates, 8 grams of fiber, and 5 grams of sugar alcohols, the net carb amount would be 7 grams (20 - 8 - 5 = 7).
While net carbs are the most important factor for keto, it's also crucial to consider the types of foods you're consuming. The keto diet typically consists of high-fat, moderate-protein, and low-carb foods like meat, fish, eggs, dairy, and green leafy vegetables. It's recommended to focus on whole foods, avoid added sugars, and read nutrition labels to make sure you're staying within your carb allowance.
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Frequently asked questions
Net carbs are the total grams of carbohydrates in a food minus its grams of dietary fibre and certain sugar alcohols. Dietary fibre is not broken down and absorbed by the body, and sugar alcohols are only partially digested and absorbed.
To calculate net carbs, subtract the amount of dietary fibre and half the amount of sugar alcohols from the total number of carbohydrates.
The keto diet focuses on net carbs because they are the carbs that are absorbed into the body and can trigger an insulin response. Fibre and some sugar alcohols are not absorbed and therefore do not count towards the daily allowance of net carbs.