How Long Does It Take To Enter Ketosis: Tips To Fasting 2024


Reviewed by Dr. Drew Sutton, MD
How Long Does It Take To Enter Ketosis
How Long Does It Take To Enter Ketosis?

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Navigating the maze of health and fitness can often be tricky, but here’s a tip: consider slashing your carbohydrate intake, bumping up the wholesome fats in your diet, and sprinkling in more physical activity. 

This combo could just be the secret to unlocking a state known as ketosis. At its core, ketosis is a normal metabolic function with many potential health perks. However, when your diet lacks carbohydrates, your body turns to its backup plan – it converts fat into little energy parcels known as ketones, turning your body into an efficient fat-burning machine.

The advantages don’t stop at weight loss, though. Research also hints at ketosis’s potential in treating conditions like type 2 diabetes and neurological disorders. So, are you ready to dive into the journey of achieving nutritional ketosis? This article might just be your roadmap.

Tips for Getting Into Ketosis in 2024

How Long Does it Take To Get Into Ketosis?

Entering ketosis isn’t an exact science, and the timeline varies considerably between individuals. 

A typical diet of 20-50 grams of carbs per day could help develop ketone bodies for most people in around 2-4 days. However, the metabolic transition might stretch to a week or even more for others.

For example, individuals accustomed to a high-carb diet before transitioning to the keto lifestyle may require longer to reach ketosis than those who consume a low carb diet. 

This delay is predominantly because your body needs to burn through its stockpiled glycogen before initiating the metabolic shift to ketosis.

Keto Diet & Ketosis Metabolic State 

Think about a standard diet, say, a typical Western one. The main energy source there? Carbohydrates. But the keto diet flips the script. It dramatically curtails carb intake, thus allowing our bodies to scout for an alternative fuel source. 

As we push down carb intake, our bodies start converting fat from our diet and stored reserves into ketones. This process, named ketogenesis, is chiefly performed by the liver, resulting in three types of ketones – acetoacetate, beta-hydroxybutyrate, and acetone.

When the ketone levels in your blood reach a range of around 0.5-3.0 mmol/L, you’ve entered ketosis! This metabolic U-turn from glucose-burning to fat-burning carries a package of health goodies, like weight loss, cognitive improvement, and lesser inflammation.

This isn’t just hearsay. Solid research supports it. For instance, a study found that low-carb diets, such as keto, outperform low-fat diets in weight loss. 

Furthermore, a 2017 paper in the Journal of Alzheimer’s Disease indicated that the keto diet may ameliorate cognitive function in Alzheimer’s patients.

However, before you rush to overhaul your eating habits, remember that achieving ketosis isn’t a stroll in the park. Instead, it demands careful meal planning and unwavering dedication.

Tips for Getting Into Ketosis in 2024

Tips for Getting Into Ketosis
Stick to the recommended 20-50 grams of carbs daily

For those finding it challenging to achieve ketosis, don’t fret. Here are some strategic tips that might aid you in navigating toward this metabolic state:

Maintain a Carb Intake of 20-50 Grams Daily 

This can trigger your body to commence ketone production. Therefore, individuals who encounter difficulty entering ketosis might need to stick to the lower end of this carb range. 

Keep a Keen Eye on Your Carb Consumption

By diligently tracking your intake, you can ensure you stick to the recommended 20-50 grams of carbs daily, thus avoiding underestimating carb intake.

Limit Dining Out at Eateries

While there’s no shortage of keto-friendly dining establishments, dining out can challenge accurate carb tracking.

Be Vigilant of Covert Carb Sources

It might seem trivial, but components like sauces and dressings can pack a surprising carb punch.

Eat More Healthy Fats

Strive to source at least 55-60% of your daily calories from nutritious fats. These could include nuts, nut butter, extra virgin olive oil, avocado oil, avocados, meats, eggs, and fatty fish such as salmon.

Consider Intermittent Fasting

Certain fasting protocols, like intermittent fasting, could assist your body in transitioning from carb-burning to fat-burning while maintaining energy equilibrium.

Increase Physical Activity

Exercise can deplete your body’s glycogen reserves, nudging your liver to ramp up ketone production. In addition, research reveals that exercising in a fasted state can aid in boosting ketone levels.

Regularly Check Your Ketone Levels

By keeping track of your ketone levels, you can determine if you’re in ketosis and adjust your diet as necessary for optimal results.

Drawbacks Of The Ketogenic Diet

Drawbacks Of The Ketogenic Diet
Strive to source at least 55-60% of your daily calories from nutritious fats

It’s essential to remember that achieving and maintaining ketosis is a highly individualized process. What works best for one person may not be as effective for another. 

Therefore, always consult a healthcare professional or dietitian when making significant dietary changes. Below are some drawbacks associated with the diet plan. 

The Keto Flu

The first few days on a ketogenic diet can be rough, with symptoms resembling the flu, such as nausea, digestive discomfort, fatigue, and lethargy. 

Luckily, these symptoms generally subside after a few days. However, to ease the transition, you might consider staying hydrated, getting ample sleep, and relying on natural energy sources like matcha green tea, organic coffee, or adaptogenic herbs.


Diarrhea can be an unexpected consequence of embarking on a ketogenic diet. This can be due to your gallbladder being overwhelmed by the increased fat intake or a lack of dietary fiber when carbs are drastically reduced. 

Including fiber-rich foods like vegetables in your meals could help. Diarrhea can also stem from an intolerance to dairy or artificial sweeteners, which may increase your diet on this high-fat, 

low-carb regimen.


Individuals with diabetes need to tread with caution when considering the keto diet. Why? Well, it’s because the diet can potentially kick off a risky situation called ketoacidosis. In layman’s terms, this condition happens when your body, switching into full-on keto mode, stashes away too many ketones. 

Unfortunately, this makes your blood too acidic, endangering essential organs like the liver, kidneys, and brain. It’s essential to consult a health professional first and keep a close eye on your blood sugar levels.

The Risk of Weight Regain

The keto diet is notoriously restrictive, and transitioning back to a regular diet often results in weight regain. Such fluctuation in weight can potentially contribute to disordered eating and exacerbate an already unhealthy relationship with food.

Loss of Muscle Mass and Slower Metabolism

Significant weight changes associated with the keto diet might lead to a loss of muscle mass, especially if your diet includes more fat than protein. This could negatively impact your metabolism since muscle burns more calories than fat. 

Suppose you regain weight after discontinuing the ketogenic diet. In that case, you’ll likely regain fat rather than lean muscle, affecting your resting metabolic rate and long-term weight.

Wrapping Up 

The golden ticket is to find a dietary routine that promotes health and well-being and aligns with your personal preferences and lifestyle.

And hey, remember this. A healthy diet is just one slice of the healthy lifestyle pie. You can’t forget the other slices – regular exercise, enough quality shut-eye, and a handle on stress. These are all key ingredients in the recipe for peak health and well-being.

Frequently Asked Questions

How fast can my body get into ketosis?

On average, it can take two to seven days. Of course, it will vary from person to person – it depends on your metabolism, how active you are, and what you’re eating.

What is “keto flu” all about?

The “keto flu” is a bunch of symptoms like fatigue, nausea, and headaches that hit when your body starts shifting to using fat for energy instead of carbs. So it’s a bit of a rough adjustment period.

How do I know if my body gets in ketosis?

You could use a blood ketone meter to get scientific about it. This gadget will give you a reading of your blood ketone levels. When they’re between 0.5 and 3.0 mmol/L, that’s usually a sign that you’re in ketosis.

Can intermittent fasting get me into ketosis quicker?

Yes, intermittent fasting could speed up your journey into ketosis. It’s like hitting the fast-forward button on limiting carb intake and burning more fat.

What are the health benefits of ketosis

The benefits are pretty compelling. Ketosis can help with weight loss, clear your mind, reduce inflammation, and even help with some risk factors for diseases like heart disease and diabetes.

Why must I eat so much fat to get into ketosis?

The high-fat thing is key. It’s like convincing your body that fat is the new fuel. Once your body buys into that, it starts producing ketones, and boom; you’re in ketosis.

Are there foods I should avoid while on the ketosis diet?

Yep, anything high in carbs is a no-go. We’re talking grains, legumes, and certain fruits – they’re all off the table if you want to stay in ketosis.

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