Is The Keto Diet Healthy?

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Since I’ve started studying nutrition, hands down the most common question I get asked is about the ketogenic diet for weight loss. I’ve previously discussed this on my instagram story, but since I get asked this so often, I also wanted to write a blog post on this topic- Is The Keto Diet Healthy? This post will discuss the ketogenic diet and some considerations for the diet when used for the purpose of weight loss.

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What is the Keto Diet?

The ketogenic diet is a diet that is characterized by high intake of fat, moderate intake of protein, and very low intake of carbohydrates. The standard ketogenic diet contains 75% fat, 20% protein, and 5% carbs1. That amounts to about 25 grams of carbohydrates per day (based on a 2000 calorie per day diet). For reference, a medium-sized apple contains about 25 grams of carbohydrates2. The goal of the keto diet is to achieve the metabolic state of ketosis. Ketosis is when your body utilizes fat as its primary source of fuel instead of carbohydrates. The keto diet has been used in a medical setting as a treatment for frequency of epileptic seizures in children. However, it is commonly also used by the general public as a means of weight loss5.

Ketosis is different than ketoacidosis. Ketosis is the normal production of ketones1. Ketoacidosis is a very high concentration of ketones that changes blood pH and can cause a person to go into a coma and can even result in death.

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It Is Difficult to Acheive Ketosis

It can take a couple of days for a person to get into ketosis. Eating too many carbs or protein can interfere with ketosis5. In order to determine if you are in ketosis, there are different tests available (urine test, blood test, etc). If you are trying to eat a keto diet, but are not in ketosis, you are essentially on a high fat diet. Fat is the most calorie-dense macronutrient. Fat contains 9 calories per gram. In comparison, protein and carbohydrates only contain 4 calories per gram. So if you’re trying to follow the keto diet, but are not in ketosis, you may be unintentionally eating more calories.

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Vegetables Contain Carbs

As discussed, the keto diet is a very low carbohydrate diet. Fruit is, of course, a carbohydrate. However, many people may not realize that vegetables also contain carbs. One cup of raw, chopped carrots contains about 9 net grams of carbohydrates3. However, brussel sprouts, a lower carbohydrate vegetable, contain about 4.5 net grams of carbohydrates per cup4. On the keto diet, intake of higher carbohydrate fruits and vegetables need to be limited in order to keep carbohydrate levels low. If you’re following the keto diet, you may miss out on all of the great nutrients in higher carbohydrate fruits and vegetables. Furthermore, it could limit the fruit and vegetable variety in your diet.

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Fiber Is A Carb

In addition to vegetables, fiber is also a carbohydrate. Fiber is found in foods, such as fruits, vegetables, and legumes, and is associated with a ton of health benefits. If you’re following the keto diet, you may miss out on the benefits of fiber.

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Excess Saturated Fat Intake

The keto diet is a high- fat diet. My concern with a high-fat diet is excess intake of saturated fat. Saturated fat is associated with certain health risks. It can increase risk for heart disease, negatively impact cholesterol, and increase risk for type 2 diabetes5. When eating fats, it’s better to focus on healthier, unsaturated fats such as olive oil, nuts, and avocados.

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Water Weight

On the keto diet or another low carb diet, you may notice lower numbers on the scale right away. Unfortunately, this initial weight loss could be due to water weight, not fat loss. This is because the storage form of carbohydrates, glycogen, attracts water (because of the hydroxyl groups in its structure). So if you limit consumption of carbohydrates, you limit the amount of glycogen and water stored. This could be the cause of the reduced number on the scale6.

If you liked this post, also checkout my post Do Diets Work for Weight Loss?

**Disclaimer: The content on this website is for informational purposes only. It is not a substitute for professional nutrition advice, medical advice, diagnosis, or treatment. Always refer to your professional health care provider for your specific nutrition and health needs.

References:

  1. Mawer, Rudy. “ The Ketogenic Diet: A Detailed Beginner’s Guide to Keto.” Healthline, July 2018, http://www.healthline.com/nutrition/ketogenic-diet-101#what-it-is.
  2. CalorieKing, http://www.calorieking.com/us/en/foods/f/calories-in-fresh-fruits-apples-with-skin-raw/9PkqpzWLSwupYVk2vXG_pA.
  3. CalorieKing, https://www.calorieking.com/us/en/foods/f/calories-in-fresh-or-dried-vegetables-carrots-raw/Nxk1bCHNQwOswcZ5YlPVEg.
  4. CalorieKing, http://www.calorieking.com/us/en/foods/f/calories-in-fresh-or-dried-vegetables-brussels-sprouts-raw/9zh6GHBYQbmiPDpJ5-o6Cw.
  5. Publishing, Harvard Health. “Should You Try the Keto Diet?” Harvard Health, Oct. 2018, http://www.health.harvard.edu/staying-healthy/should-you-try-the-keto-diet.
  6. Samuels, Mike. “Glycogen and Weight Loss.” LIVESTRONG.COM, Leaf Group, http://www.livestrong.com/article/307905-glycogen-and-weight-loss/.

One response to “Is The Keto Diet Healthy?”

  1. […] popular diet used for the purpose of weight loss. I discussed the keto diet in my previous post, Is The Keto Diet Healthy? Check out that post to learn more about the ketogenic diet and some considerations when doing that […]

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About Mel


Hi, I’m Mel! I am a registered dietitian who specializes in women’s nutrition (fertility, prenatal, and postpartum) as well as nutrition for busy professionals. I am passionate about helping others live a healthy lifestyle that is practical and sustainable for them. Whether you are pregnant, postpartum, or a busy individual, I’m here to make nourishing yourself simple and not stressful. Read More

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