Cutting Carbs, Trying a Short Fast, and Other Ways to Get into Ketosis (2024)

Cutting carbs, increasing your intake of healthy fats, and getting more exercise may help you enter ketosis.

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Ketosis is a normal metabolic process that provides fuel for your body at times when fewer carbohydrates are available. Nutritional ketosis may offer health benefits.

During nutritional ketosis, your body converts fat into compounds called ketones and begins using them as its main source of energy. Ketones are also known as ketone bodies.

Diets that promote ketosis are highly beneficial for weight loss, partly due to their appetite-suppressing effects. Ketosis may also be helpful for type 2 diabetes and neurological disorders, among other conditions.

But getting into a state of ketosis can take some work and planning. It’s not as simple as just cutting carbs.

There is still debate about the long-term safety of the ketogenic diet. Before making major dietary changes, such as trying a ketogenic diet, it’s important to consult a qualified health professional. This is especially the case for children, those who have underlying health conditions, and those who are pregnant or breastfeeding.

Potential risks of this style of eating include nutritional deficiencies, kidney stones, changes in electrolyte levels, and bone loss.

Here are 7 effective tips to get into ketosis.

Eating a very low carb diet is by far the most important factor in entering ketosis.

Your cells typically use glucose (sugar) as their main source of fuel. However, most of your cells can also use other fuel sources, including fatty acids and ketones.

Your body stores glucose in the form of glycogen in your liver and muscles.

When your carb intake is very low, your glycogen stores are reduced and your levels of the hormone insulin decline. This allows fatty acids to be released from fat stores in your body.

Your liver converts some of these fatty acids into the ketones acetone, acetoacetate, and beta-hydroxybutyrate. Portions of your brain can use these ketones as fuel.

The degree of carb restriction needed to induce ketosis varies by the person and can be affected by certain factors, such as the types of exercise you do.

Some people need to limit their net carb intake to 50 grams (g) or fewer per day, while others can get into ketosis while eating more than that.

For this reason, the induction phase of the Atkins diet requires restricting carb intake to 20 g or fewer per day for 2 weeks to guarantee that you get into ketosis.

After that, you can add small amounts of carbs back to your diet very gradually, as long as you maintain ketosis.

Each person will potentially have a different carb intake limit to reach and maintain ketosis, depending on the total number of calories they eat and their daily activity levels. Generally, eating 5–10% of total calories from carbs will produce ketosis.

These carb and ketone ranges are advised for people who want to get into ketosis to promote weight loss, manage their blood sugar levels, or reduce their heart disease risk factors.

Ketogenic diets used in epilepsy management and as experimental cancer therapy may also restrict carbs. However, anyone using the diet for therapeutic purposes should do so only under the supervision of a medical professional.

Eating coconut oil can help you get into ketosis.

Importantly, not all commercial coconut oil products you can buy in stores have the same content and health benefits.

Generally, coconut oil contains fats called medium-chain triglycerides (MCTs).

Unlike most fats, MCTs are rapidly absorbed and taken directly to your liver, where they can be used immediately for energy or converted into ketones.

Consuming coconut oil and these MCTs may be one of the best ways to increase ketone levels in people with Alzheimer’s disease and other nervous system disorders.

Although coconut oil contains four types of MCTs, around 50% of its fat comes from the kind known as lauric acid.

Some research suggests that fat sources with a higher percentage of lauric acid may produce a more sustained level of ketosis. This is because it’s metabolized more gradually than other MCTs.

MCTs have been used to induce ketosis in children who have epilepsy. In a high MCT diet, ketosis occurs without restricting carbs as drastically as in the classic ketogenic diet.

Other research has found that a high MCT diet containing around 20% of calories from carbs produces effects similar to those of the classic ketogenic diet, which provides fewer than 5% of calories from carbs.

When adding coconut oil to your diet, it’s a good idea to do so slowly to minimize possible digestive side effects such as stomach cramping and diarrhea.

Being more physically active each day can help you get into and stay in ketosis. It may also be beneficial for some types of athletic performance.

When you exercise, you deplete your body’s glycogen stores. These are normally replenished when you eat carbs, which are broken down into glucose. The glucose that isn’t needed immediately is stored as glycogen.

However, if you minimize your carb intake, your glycogen stores remain low. In response, your liver increases its production of ketones, which can be used as an alternative fuel source for your muscles.

Working out in a fasted state has been shown to drive up ketone levels.

But. keep in mind that although exercise increases ketone production, it may take 1–4 weeks for your body to adapt to using ketones and fatty acids as primary fuel sources. During this time, your physical performance may be temporarily reduced.

Consuming plenty of healthy fats can boost your ketone levels and help you reach ketosis.

Indeed, a very low carb ketogenic diet not only minimizes carbs but also calls for a high fat intake.

Ketogenic diets for weight loss, exercise performance, and metabolic health usually provide 55–60% of calories from fat.

The classic ketogenic diet used for epilepsy is even higher in fat. Typically, 85–90% of calories come from fat.

However, extremely high fat intake doesn’t necessarily translate into higher ketone levels.

A 3-week study from 2015 that included 11 healthy people compared the effects of fasting on breath ketone levels. Overall, ketone levels were found to be similar in people consuming 79% of calories from fat and people consuming 90% of calories from fat.

Because fat makes up such a large percentage of a ketogenic diet, it’s important to choose high quality fat sources.

Healthy fats include fatty fish, olive oil, and avocado oil. Many healthy, high fat foods are also very low in carbs.

However, consuming high fat foods can lead to side effects such as:

  • constipation
  • diarrhea
  • fatigue
  • abdominal pain
  • vomiting
  • gastroesophageal reflux disease (in some children)

If weight loss is your goal, it’s important to make sure you’re not consuming too many calories in total, as this can cause your weight loss to stall.

Another way to get into ketosis is to go without eating for several hours.

In fact, many people go into mild ketosis between dinner and breakfast.

Children with epilepsy traditionally fasted for 12–48 hours before they started a ketogenic diet. This approach often required supervision in a hospital.

Nonfasting protocols are more commonplace now. However, fasting can help ensure that some children get into ketosis quickly so that seizures can be reduced sooner.

Intermittent fasting, a dietary approach that involves regular short-term fasts, may also induce ketosis.

Getting into ketosis requires a protein intake that’s adequate but not excessive.

The classic ketogenic diet used in people with epilepsy restricts both carbs and protein to maximize ketone levels.

The same diet may be beneficial for people with cancer, as it may limit tumor growth.

However, for most people, drastically cutting protein intake to increase ketone production isn’t a healthy practice.

First, it’s important to consume enough protein to supply your liver with amino acids that can be used for gluconeogenesis, or making glucose.

In this process, your liver provides glucose for the few cells and organs in your body that can’t use ketones as fuel, such as your red blood cells and portions of your kidneys and brain.

Second, protein intake should be high enough to maintain muscle mass when carb intake is low, especially during weight loss.

Although losing weight typically results in the loss of both muscle and fat, consuming enough protein on a very low carb diet can help preserve muscle mass.

Several studies have shown that the preservation of muscle mass and physical performance is maximized when protein intake is in the range of 0.55–0.77 grams per pound (g/lb), or 1.2–1.7 grams per kilogram (g/kg), of lean mass.

A daily protein intake of 0.45–0.68 g/lb (1–1.5 g/kg) will help you maintain lean mass while losing weight.

To calculate your protein needs on a ketogenic diet, multiply your ideal body weight in pounds by 0.55–0.77 (1.2–1.7 in kilograms). For example, if your ideal body weight is 130 lb (59 kg), your protein intake should be 71–100 g.

As with many things in nutrition, reaching and maintaining a state of ketosis is highly individualized.

Therefore, it can be helpful to test your ketone levels to ensure you’re achieving your goals.

The three types of ketones — acetone, acetoacetate, and beta-hydroxybutyrate — can be measured in your breath, urine, and blood, respectively. Using one or more of these methods to test ketone levels can help you determine whether you need to make any adjustments to get into ketosis.

Acetone and the breath test

Acetone is found in your breath, and studies have confirmed that testing acetone breath levels is a reliable way to monitor ketosis in people following ketogenic diets.

The Ketonix meter measures acetone in your breath. After breathing into the meter, a color flashes to indicate whether you’re in ketosis and how high your levels are.

Acetoacetate and the urine tests

The ketone measured in urine is acetoacetate. Ketone urine strips are dipped into urine and turn various shades of pink or purple depending on the level of ketones present. A darker color reflects higher ketone levels.

Ketone urine strips are easy to use and fairly inexpensive. Although their accuracy in long-term use has been questioned, they should initially confirm that you’re in ketosis.

A small 2016 study found that, in people on a ketogenic diet, urinary ketones tend to be highest in the early morning and after dinner.

Beta-hydroxybutyrate and the blood test

Lastly, ketones can be measured with a blood ketone meter. It works similarly to a glucose meter — you place a small drop of blood on a strip and insert it into the meter.

It measures the amount of beta-hydroxybutyrate in your blood, and this has been found to be a valid indicator of ketosis levels.

The disadvantage of measuring blood ketones is that the strips are very expensive.

Shop for ketone strips and blood test strips online.

When you get into ketosis, your body begins to use ketones for fuel.

For people who have adopted a ketogenic diet as a means to lose weight, getting into ketosis is an important step toward that goal. Other benefits of ketosis include seizure reduction in people with epilepsy.

Cutting your carb intake is the best way to get into ketosis. Other actions, such as consuming MCT oil and exercising in a fasted state, may also help.

Quick and easy methods, such as using special urine strips, can let you know whether you’re maintaining ketosis or you need to make some adjustments to your diet.

Cutting Carbs, Trying a Short Fast, and Other Ways to Get into Ketosis (2024)

FAQs

Cutting Carbs, Trying a Short Fast, and Other Ways to Get into Ketosis? ›

If you eat between 20 and 50 grams of carbohydrates each day, it will usually take you two to four days to enter ketosis. However, the time it takes to enter this state varies based on several factors. It may take you a week or longer to get into ketosis.

How to get into ketosis asap? ›

Tips to achieve ketosis
  1. Eat 20–50 grams of carbs per day. This can encourage your body to produce ketones. ...
  2. Track your carb intake. ...
  3. Limit eating out at restaurants. ...
  4. Be aware of hidden carb sources. ...
  5. Increase your intake of high quality fats. ...
  6. Try intermittent fasting. ...
  7. Exercise more. ...
  8. Test your ketone levels regularly.

How many days of low carb does it take to reach ketosis? ›

If you eat between 20 and 50 grams of carbohydrates each day, it will usually take you two to four days to enter ketosis. However, the time it takes to enter this state varies based on several factors. It may take you a week or longer to get into ketosis.

How to get back in ketosis in 24 hours? ›

You can make several diet changes to reach ketosis in 24 hours, including:
  1. Increasing your fat intake.
  2. Cutting out added sugars and processed snacks.
  3. Eating moderate amounts of protein.
  4. Consuming an abundance of non-starchy vegetables.
  5. Taking supplements such as exogenous ketones.
Jan 31, 2023

How many carbs do you need to eat to keep from going into ketosis? ›

Most ketogenic diet guidelines recommend limiting your total carbohydrate intake to 15-30 grams or 5%-10% of your total calorie intake a day. Eating more than 50 grams of carbs may disrupt ketosis. With keto diets, however, carb restrictions vary from person to person.

Why am I not in ketosis with no carbs? ›

If you are struggling to get into ketosis even though you've restricted your carbohydrate intake and are eating lots of healthy fat, it may be time to look at some other factors. Try to reduce your stress levels, get enough sleep, and take a look at how much protein you are consuming.

How to avoid ketoacidosis on a keto diet? ›

Prevention of ketoacidosis
  1. monitoring blood glucose levels regularly and notifying a doctor if they are not under control.
  2. testing the urine for ketones if blood glucose levels are above 240 mg/dl.
  3. avoiding exercise if ketones are present in the urine and blood glucose levels are high.
Jan 22, 2019

Will a 16 hour fast put me in ketosis? ›

Intermittent fasting can trigger ketosis, but only if you fast for at least 12 hours and potentially up to 18. It's also not the only way to stimulate ketosis — following a low-carb eating routine or extended periods of intense exercise can also trigger this fat-burning metabolic phase.

What hour do you hit ketosis? ›

Your body may go into ketosis after just 12 hours of not eating, which many people do overnight before they "break fast" with a morning meal. (A midnight snack obviously sabotages this process.) A keto diet keeps you in ketosis for much longer time periods because you avoid carbohydrates, which supply glucose.

Is peanut butter keto? ›

Peanut butter can definitely be part of a keto diet, but it's best to stick to plain options that are free of extra flavors and sweeteners. Almond butter is a good choice, too, and it's slightly lower in carbs. Additionally, you should be mindful of your portion size if you're trying to lose weight.

What food has no carbs? ›

Food and drinks allowed on a no-carb diet include meat, fish, eggs, cheese, butter, oils, water, and plain coffee or tea. If you're less stringent, you can also eat nuts, seeds, non-starchy vegetables, and high fat fruits like avocado and coconut since these foods are low in net carbs.

Does fiber cancel out carbs keto? ›

On the ketogenic diet, the "net carb" is the amount of carbs in a food minus the fiber and sugar alcohol. Fiber and sugar alcohol are subtracted because the body does not fully absorb them. The keto net carb diet limits daily carbohydrate consumption to 20-50 grams to induce ketosis.

Can you eat too much protein on keto? ›

Disadvantages of Protein on a Keto Diet

Consuming too much protein can cause your body to convert it into glucose through a process called gluconeogenesis, which can inhibit ketosis. Additionally, too much protein can strain the kidneys, especially for those with pre-existing kidney issues.

Can you lose weight on 50 carbs a day? ›

You may lose weight faster on 50 g of carbs a day or less, but it depends on what else you're eating, how many calories you're consuming, how active you are, and many other factors. In addition, eating slightly more carbs may lead to lower but more sustainable weight loss.

How to get into ketosis in 12 hours? ›

Your body may go into ketosis after just 12 hours of not eating, which many people do overnight before they "break fast" with a morning meal. (A midnight snack obviously sabotages this process.) A keto diet keeps you in ketosis for much longer time periods because you avoid carbohydrates, which supply glucose.

Will a 24 hour fast put me in ketosis? ›

However, you can actually enter ketosis thanks to the power of fasting! Going on a 24-hour fast before you start the keto diet can actually put your body in a state of ketosis. During that period, your body will burn through its glucose reserves, which will set you up to begin burning body fat and dietary fat for fuel.

How do I know when I'm in ketosis? ›

Having ketones in the blood is probably the most definitive sign that someone is in ketosis. Doctors may also use urine and breath tests to check for ketone levels, but these are less reliable than blood samples. A special home testing kit allows people to measure their own blood ketone levels.

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