How to understand net Carbs


In recent years, carb counting has become a major point of dietary emphasis. With many low-carb diets such as keto and Atkins becoming more commonplace, it is crucial to account for carbohydrates properly.

Nets Carbs

The problem is there is an ongoing debate between whether carbs or “net carbs” should be counted as part of one’s macronutrient profile. While some groups argue total carb count is a more precise measurement, others disagree with this sentiment.

Not all carbohydrates have the same effect from a dietary perspective. While some are more digestible, others tend to pass through the body without being absorbed. It is important to understand the differences between carbs and net carbs so that you can determine which form of measurement is most conducive to your lifestyle and goals.

Carbohydrates defined

Before we dive into net carbs, it helps to know what a carb actually is in the first place. Carbohydrates are an umbrella term for molecules containing carbon, hydrogen, and oxygen atoms.

There are two main types of carbs found in the foods we eat—simple carbs and complex carbs. Simple carbs are found mostly in sugary foods and contain only one or two sugar unit molecules, which can affect how quickly the food is digested and absorbed. Some examples are fruits and foods containing table sugar, like soda or cookies.

Complex carbs are slower digesting in nature and contain several sugar units linked together. They are often found in whole grains, starchy vegetables, white and sweet potatoes, carrots, and oats.

While simple and complex carbs can be used as an energy source or stored as fat. If a person consumes more carbs than needed, the body will convert excess carbs to fat.

There are other types of carbs, which are not readily digestible by the body.

Fibber is different from the other two forms of carbohydrates. While it is similar in molecular profile, it does not provide a direct form of energy—it passes through the body without being digested and absorbed into the bloodstream for energy. The main role of fibre is to feed friendly bacteria in the digestive system.

Sugar alcohols also fall under the carbohydrate umbrella. They are typically used as a form of sweetener and contain only half the amount of calories as traditional carbohydrates; in addition are added to food as a reduced calorie sweetener and as a bulking agent.

Although each of these is considered carbs, the body handles each of them differently. These differences allow us to think that not all carbs are created equal. We should not look at them as all playing the same role without our body.

Net Carbs Explained

Net carbs refers to carbs that are absorbed and processed by the body. Simple and complex carbs are found in foods we eat. They are broken down in the small intestine and later become used as a source of energy in the body.

Those other types of carbs, such as fibres and sugar alcohols, cannot be broken as easily. Because our bodies do not actually absorb these types of carbs (to use them for energy), many people subtract fibres and sugar alcohols from overall carbohydrate amount.

This is often where debate tends to arise. While some count every single carb in their diet, others subtract fibre and sugar alcohols because the body does not retain these macronutrients in the same manner.

Understanding Fibre

Unlike other forms of carbohydrates, fibre is not directly used as a natural fuel source for the body. It passes directly into the colon and cannot be broken down by enzymes in the digestive tract. Because of this, less than half the total carbohydrates from dietary fibre are metabolized to glucose.
Fibre is best known for its ability to relieve constipation, especially soluble fibre (hello fruit, oatmeal, avocados and broccoli!), but can also provide several other health benefits.

Elevated fibre intake can reduce the risk of colon cancer in one study, but as mentioned earlier, this cause and effect action is now being debated among the scientific community. Even within fibre, there are two main types—insoluble and soluble fibre.

Take Insoluble Fibre, it does not dissolve in water and can help speed the passage of bowel movements thereby preventing constipation. It contains no calories, nor does it spike blood glucose or insulin levels, and is not broken down by the gut, also it helps keep bowel movements regular and helps maintain a healthy digestive system, in addition it an important part of your dietary requirement, as it can help support several our bodily functions.

You can usually found fibre in the stalks, skins, and seeds of foods such as whole grains, nuts, and veggies. Common foods with insoluble fibre include:

  • Beans
  • Whole wheat
  • Bran
  • Potatoes
  • Cauliflower
  • Nuts
  • Green beans

With Soluble Fibre, it dissolves in water and is digested by bacteria in the large intestine. One of the benefits of soluble fibre is its ability to help you feel full (and potentially, this can help you lose weight). A study performed on soluble fibre found that consuming 14g per day was associated with a 10% decrease in energy consumption (less food eaten) and weight loss of 1.9kg over a four-month period.

As soluble fibre goes into your colon, it becomes short-chain fatty acids, which can help improve gut health and reduce inflammation. In a recent meta-analysis also looked at those with high fibre consumption and found soluble fibre can also help reduce the risk of developing type 2 diabetes.

Both our MCT Oil Powder and Keto Collagen+ contain a base of acacia fibre, which is rich in soluble fibre. What is the best part? Both products contain zero net carbs, making them a no-brainer to add to your daily nutrition strategy for a great source of fibre and keto energy.

Understanding Sugar Alcohols

Sugar alcohols are processed in a manner similar to fibre—they are not directly absorbed by the body. They are found naturally in foods and can be used as low calorie sweeteners and bulking agents. Typically, they are used as sugar substitutes that contain about half the amount of calories as regular sugar.

As the name suggests, they are a hybrid of sugar molecules and alcohol molecules. Their chemical structure is similar to sugar, and thus has the ability to activate sweet taste receptors on your tongue. That is part of their allure: sweet taste, far fewer calories.

You will typically find sugar alcohols in foods such as chewing gums, ice creams, frostings, cakes, cookies, candies, as well as some foods that claim to be low in carbs or sugar. The most common sugar alcohols used today include:

  • Erythritol
  • Isomalt
  • Maltitol
  • Sorbitol
  • Xylitol

With Erythritol has the least amount of net carbs. With 90% of it is excreted in urine and only 10% enters the colon.

There are limited studies available on sugar alcohols, but no known studies have shown raised insulin or blood sugar levels as a result. Studies have shown, however, that some individuals do not process sugar alcohols well and report excessive gas and sometimes, diarrhoea.

This is because sugar alcohols are fermented by the gut microbiome (fermentation produces gas as a by-product) and because they affect the osmolality within your intestine, (they cause excess water to end up in your stool/colon). This response often depends on the amount consumed, so if you are thinking of adding sugar alcohols to your diet or increasing the amount, do so cautiously.

How to Calculate Net Carbs

If you choose to use net carbs as a basis of your dietary calculations for macronutrients, it will help to make sure you are accurately accounting for them. Net carbs are calculated differently for both fibre and sugar alcohols. Be sure to read nutrition labels closely as “net carbs” are not listed separately.

Calculating net carbs using both carbohydrate and fibre amounts is super simple. If you are eating whole foods containing fibre, simply subtract the fibre from total carbs to calculate the net carbs.

For example, an apple contains 25g of carbohydrates and 5g of fibre. The result would be 20g of net carbs. This is a little more difficult when consuming those whole foods because they do not have nutrition labels. However, a simple online search should help you give you an accurate estimation.

If you are consuming foods with a nutrition label, both carbs and fibre should be listed and thus, net carbs easily calculated. In most cases, half the carbs from sugar alcohols can be subtracted from total carbs. For example, if a food contains 8g of sugar alcohols, you can subtract 4g from total carbs to determine net carbs.

One exception to the rule is Erythritol. The carbs from Erythritol can completely be subtracted from total carbs.

Most of the time, you will be subtracting fibre from carbohydrate amount to determine net carbs. Sugar alcohols are less common, but check nutrition labels to see if what you are eating contains them, and make this part of your calculation when determining net carbs.

Case for Net Carbs

In conclusion, people debate about whether counting net carbs provides a more accurate representation compared to total carbs.

Using net carbs will allow for more dietary flexibility because you are able to eat fibre-rich foods without consuming too many carbohydrates. There are also numerous health benefits associated with fibre consumption; a study performed on individuals who regularly consumed fibre showed improved blood sugar levels and lower cholesterol.

On the other hand, people on a keto diet may argue against net carbs because the carbohydrate amount you are consuming may take you out of ketosis. Not all people process fibre the same way—therefore, it is important to understand what works best for your body.

If in doubt, why consider following a healthy eating pyramid, which allow you to aim to get portion sizes correct and getting a little exercise each day; plus try to eat ‘good carbs’ whenever possible, as they provide a better source of energy – Energy in = energy out.

People trying to avoid carbohydrate intake may tend to eat more sugar-free problems, which can lead to other health problems such as weight gain, metabolic disorders, and type-2 diabetes.

When it comes down to it, using net carbs can be an imperfect science. Using total carbs can help provide a better framework for helping you to stick to your diet. However, if you eat many fibrous foods such as vegetables, using net carbs may be the perfect choice for your lifestyle. Alternatively, if you are on keto, and you find yourself constipated, consuming more fibre might be advantageous.

You may have avoided those carbs to stick to your macros, and in the process, avoided fibre as well.

No matter if, you choose to use net carbs or not, always make the dietary choices that best fit your individual lifestyle and goals. The best diet will always be the one you can stick to long-term.


Blog post by Ryan Rodal