All You Need to Know About Carbs on a Low-Carb Ketogenic Diet

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When it comes to ideal carbs intake, I've discussed it in my post here: How Many Carbs per Day on Low-Carb Ketogenic Diet? However, daily carbs intake is not the only aspect you should focus on.

Does Our Body Need Carbs? It's a common misconception that our body — especially our brain — needs carbs. In fact, the brain can either use glucose or ketones. When you restrict the intake of carbohydrates, your body will switch to using ketone bodies instead of using glucose. Not only that, ketones are a better fuel for our body and brain than glucose, even for highly active individuals. Once you get keto-adapted (3-4 weeks), you will experience improved energy levels. Although a small amount of glucose is still needed, our body can produce glucose on demand via gluconeogenesis. Dr Volek and Dr Phinney, The Art and Science of Low Carbohydrate Performance (2012):

"Ketone bodies are an important lipid-based fuel, especially for the brain, when dietary carbohydrates are restricted." It has been estimated that about 200 grams of glucose can be generated daily just from protein (Dr Briffa, Escape the Diet Trap, 2012). Our body needs some glucose (for the red blood cells and portions of the brain and kidney that can’t use ketones) but according to Dr Volek, it's a very small amount. As I said in my post here, there is no need for everybody to follow a very low-carb / "zero-carb" diet and you may need to adjust the level of carbs to fit your needs.

Types of Carbs in Ketogenic Diets Generally, you should avoid any sugary or starchy foods. The best measure to represent "good" and "bad" carbohydrates is their Glycemic Load (GL), which measures how much insulin will be released by your body for a given food measured in standard portions. This is different to Glycemic Index (GI), which doesn't take the serving size into account. As a result, some foods with a high GI could have a modest GL. Therefore, Glycemic Load is recommended as the best measure for carbs. Most of your carbs should come from non-starchy vegetables (leafy greens, cruciferous vegetables such as broccoli, zucchini, etc.) and nuts. One of the exceptions where high GI/GL food is recommended is on Targeted Ketogenic Diet (TKD). According to Lyle McDonald in his book "The Ketogenic Diet": "Although experimentation is encouraged, most individuals find that 25-50 grams of carbohydrates taken thirty minutes before a workout enhance performance. The type of carbohydrate consumed pre-workout is not critical and individuals are encouraged to experiment with different types of carbs. Most seem to prefer easily digestible carbohydrates, either liquids or high Glycemic Index (GI) candies to avoid problems with stomach upset during training. A wide variety of foods have been used prior to workouts: glucose polymers, Sweet Tarts, bagels, and food bars; all result in improved performance." The #1 Keto Diet App Free Download 1,500+ delicious keto recipes Trialed & tested for best results Optimized for nutrition Never feel hungry Planner & tracker Track all macros including net carbs Scan products Create your own meals Advanced tracking Track ketones, blood glucose & lipids Stay hydrated with water tracking Track your mood & energy levels Macro calculator Calculate your ideal fat, protein & carb intake Set any goal: weight loss, maintenance or weight gain Your macros update based on your progress Progress Monitor your macros, water intake, mood & energy Body weight, body fat and body measurements Ketones, blood glucose & lipids Evidence-based content Expert articles to help you make informed choices Guides & free diet plans New daily content And so much more...! Complete Keto Diet guide Integrated shopping basket Restaurants & guide to eating out Free Download App Store Google Play App Store Also available on Google Play Google Play Also available on App Store

Total Carbs vs Net Carbs A frequent question amongst low-carb dieters is: Should fiber be included when counting carbs? Let's look at the evidence: Although some soluble fiber may be absorbed, humans don't have the enzymes that could digest most fiber and derive any calories from it. As a result, fiber does not significantly affect blood sugar and ketosis. In general, you can either aim for 20-25 grams of net carbs or ~ 50 grams of total carbs as recommended by Dr. Steve Phinney and Dr. Jeff Volek. When fiber is not included, the derived carbohydrate values are known as net carbs. Using net carbs reduces the impact of high-fiber foods (vegetables, nuts, etc.) and you can include them in your diet. This turns out to be an argument against those that criticize low-carb diets for the lack of fiber. It's important to stress that fiber doesn't negate carbs - it's simply not counted; so mixing flax meal into a bowl of pasta won't work! You can read more about total vs net carbs in my post here. Here is the catch: When it comes to food labeling, in countries like US and Canada, carbohydrate values also include fiber (i.e. total carbs). These countries use the indirect method of calculating carbs which means that carbs are calculated "by difference" after they measure protein, fat, water and ash per 100 grams. To get the value for net carbs, you will need to subtract fiber from total carbs. However, this food labeling doesn't apply universally. In other places like Europe, Australia and Oceania, it's common to exclude fiber. They use the direct method of calculating carbs, and therefore "carbs" on food labels refer to net carbs. Keep in mind it doesn't matter where a certain product is sold but where it's imported from. How can you be absolutely certain about the number of net carbs? Here are 3 simple rules to follow: total carbs can never be lower than fiber

total carbs minus fiber can never be less than sugar (net carbs = sucrose + lactose + other sugars + starch)

total kcal = calories from fat + calories from protein + calories from carbs (without fiber) Thankfully, you don't need to do the math yourself. You can use this Hidden Carbs Calculator to find out.

How Many Carbs Per Meal to Avoid Blood sugar Spikes? We are all different and what is too much for you, may not be for someone else. The best way to find out is to monitor how you feel. If you feel tired and sleepy after a meal, you likely had too many carbs and are experiencing the effects of elevated blood sugar and insulin: an increase in neurohormones that cause drowsiness. The trouble is that with elevated blood sugar, you will soon become hungry and eat more than usual. Unless you eat extra carbs as part of TKD, you should avoid eating too many carbs. Some people can't eat more than 10 grams of net carbs per meal, while others don't experience any significant insulin spikes at a much higher level such as 50 grams of net carbs. My personal carb tolerance is quite high but I avoid using certain foods such as tropical fruit and even some low-carb sweeteners like Xylitol. Apart from potentially causing terrible digestive issues, Xylitol is not zero-carb and may affect your blood sugar. I prefer to use Erythritol or stevia which have very few carbs. Having said that, not all people have issues with Xylitol. For more about sweeteners, check out my post Complete Guide to Sweeteners on a low-carb Ketogenic Diet.

"Zero-carb" Products and Marketing Tricks Some brands of low-carb foods use misleading labels such as, "carbs-free", "low-carb" or "zero-carb". You have to be extra careful when buying products like that. Apart from pure fat and meat, there is nothing truly zero-carb. It's not a secret that Atkins products and many others use effective and deceptive marketing tricks. Their products often contain sorbitol, maltitol and other types of sugar alcohols that are associated with insulin spikes and raised blood sugar levels. The paradox here is that even Dr. Atkins in his 1999 edition of "New Diet Revolution", said that "Sweeteners such as sorbitol, mannitol and other hexitols (sugar alcohols) are not allowed." According to Dr. Andreas Eenfeldt (also known as Diet Doctor), there are more than just Atkins Fairy Tale Cookies to avoid: Julian's Bakery Bread and Dreamfields Low-carb Pasta can be added to the list. In summary, make sure you always opt for real unprocessed food and avoid prepared meals full of additives and deceptive labelling.

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Martina Slajerova Creator of KetoDietApp.com I changed the way I ate in 2011, when I was diagnosed with Hashimoto’s, an autoimmune disease that affects the thyroid. I had no energy, and I found it more and more difficult to maintain a healthy weight. That’s when I decided to quit sugar, grains, and processed foods, and to start following a whole-foods-based ketogenic approach to food. More posts by Martina Slajerova Martina Slajerova About the Reviewer This article has been reviewed by Franziska Spritzler, RD, CDE who is a qualified expert. At KetoDiet we work with a team of health professionals to ensure accurate and up-to-date information. You can find out more on the About us page.