Epilepsy is one of the most common neurological disorders after stroke,[7] and affects around 50 million people worldwide.[8] It is diagnosed in a person having recurrent, unprovoked seizures. These occur when cortical neurons fire excessively, hypersynchronously, or both, leading to temporary disruption of normal brain function. This might affect, for example, the muscles, the senses, consciousness, or a combination. A seizure can be focal (confined to one part of the brain) or generalised (spread widely throughout the brain and leading to a loss of consciousness). Epilepsy can occur for a variety of reasons; some forms have been classified into epileptic syndromes, most of which begin in childhood. Epilepsy is considered refractory (not yielding to treatment) when two or three anticonvulsant drugs have failed to control it. About 60% of patients achieve control of their epilepsy with the first drug they use, whereas around 30% do not achieve control with drugs. When drugs fail, other options include epilepsy surgery, vagus nerve stimulation, and the ketogenic diet.[7]
Gary D. Foster, Ph.D., Holly R. Wyatt, M.D., James O. Hill, Ph.D., Brian G. McGuckin, Ed.M., Carrie Brill, B.S., B. Selma Mohammed, M.D., Ph.D., Philippe O. Szapary, M.D., Daniel J. Rader, M.D., Joel S. Edman, D.Sc., and Samuel Klein, M.D., “A Randomized Trial of a Low-Carbohydrate Diet for Obesity — NEJM,” N Engl J Med 2003; 348:2082- 2090. http://www.nejm.org/doi/full/10.1056/NEJMoa022207.
In many developing countries, the ketogenic diet is expensive because dairy fats and meat are more expensive than grain, fruit and vegetables. The modified Atkins diet has been proposed as a lower-cost alternative for those countries; the slightly more expensive food bill can be offset by a reduction in pharmaceutical costs if the diet is successful. The modified Atkins diet is less complex to explain and prepare and requires less support from a dietitian.[55]

You’ve probably heard about the low carb, high fat diet that’s so popular among actors and models, and with good reason: low carb diets offer proper nourishment with whole foods, while keeping your body burning fat for fuel. This is a great way to be, as it makes fat loss largely effortless! But where does this “ketogenic” word fit into the picture?


A popular keto supplement are exogenous ketones (popularly called “keto diet pills”) that may help you achieve results earlier as well as remain in that state. (Don’t confuse exogenous ketones with raspberry ketones, as the latter don’t raise ketone levels in the body or mimic endogenous ketones, so you wouldn’t use raspberry ketones in your regimen.)
When you’re eating the foods that get you there (more on that in a minute), your body can enter a state of ketosis in one to three days, she adds. During the diet, the majority of calories you consume come from fat, with a little protein and very little carbohydrates. Ketosis also happens if you eat a very low-calorie diet — think doctor-supervised, only when medically recommended diets of 600 to 800 total calories.
Infants and patients fed via a gastrostomy tube can also be given a ketogenic diet. Parents make up a prescribed powdered formula, such as KetoCal, into a liquid feed.[19] Gastrostomy feeding avoids any issues with palatability, and bottle-fed infants readily accept the ketogenic formula.[31] Some studies have found this liquid feed to be more efficacious and associated with lower total cholesterol than a solid ketogenic diet.[18] KetoCal is a nutritionally complete food containing milk protein and is supplemented with amino acids, fat, carbohydrate, vitamins, minerals and trace elements. It is used to administer the 4:1 ratio classic ketogenic diet in children over one year. The formula is available in both 3:1 and 4:1 ratios, either unflavoured or in an artificially sweetened vanilla flavour and is suitable for tube or oral feeding.[51] Other formula products include KetoVolve[52] and Ketonia.[53] Alternatively, a liquid ketogenic diet may be produced by combining Ross Carbohydrate Free soy formula with Microlipid and Polycose.[53]
Essential fatty acids (the omegas) provide core functions to the human body, but they are often times out of balance when on a standard diet. On keto, with a little bit of preparation, your omega fatty acids are easily manageable. If you want to know more about essential fatty acids, omegas, and how they interact with our body on a ketogenic diet, you can read more here >
When in the hospital, glucose levels are checked several times daily and the patient is monitored for signs of symptomatic ketosis (which can be treated with a small quantity of orange juice). Lack of energy and lethargy are common, but disappear within two weeks.[17] The parents attend classes over the first three full days, which cover nutrition, managing the diet, preparing meals, avoiding sugar, and handling illness.[19] The level of parental education and commitment required is higher than with medication.[44]
The ketogenic diet is calculated by a dietitian for each child. Age, weight, activity levels, culture, and food preferences all affect the meal plan. First, the energy requirements are set at 80–90% of the recommended daily amounts (RDA) for the child's age (the high-fat diet requires less energy to process than a typical high-carbohydrate diet). Highly active children or those with muscle spasticity require more food energy than this; immobile children require less. The ketogenic ratio of the diet compares the weight of fat to the combined weight of carbohydrate and protein. This is typically 4:1, but children who are younger than 18 months, older than 12 years, or who are obese may be started on a 3:1 ratio. Fat is energy-rich, with 9 kcal/g (38 kJ/g) compared to 4 kcal/g (17 kJ/g) for carbohydrate or protein, so portions on the ketogenic diet are smaller than normal. The quantity of fat in the diet can be calculated from the overall energy requirements and the chosen ketogenic ratio. Next, the protein levels are set to allow for growth and body maintenance, and are around 1 g protein for each kg of body weight. Lastly, the amount of carbohydrate is set according to what allowance is left while maintaining the chosen ratio. Any carbohydrate in medications or supplements must be subtracted from this allowance. The total daily amount of fat, protein, and carbohydrate is then evenly divided across the meals.[37]
Early studies reported high success rates; in one study in 1925, 60% of patients became seizure-free, and another 35% of patients had a 50% reduction in seizure frequency. These studies generally examined a cohort of patients recently treated by the physician (a retrospective study) and selected patients who had successfully maintained the dietary restrictions. However, these studies are difficult to compare to modern trials. One reason is that these older trials suffered from selection bias, as they excluded patients who were unable to start or maintain the diet and thereby selected from patients who would generate better results. In an attempt to control for this bias, modern study design prefers a prospective cohort (the patients in the study are chosen before therapy begins) in which the results are presented for all patients regardless of whether they started or completed the treatment (known as intent-to-treat analysis).[19]
As for branched-chain amino acids, you'll find smart people who swear that they're keto-friendly, and others who don't. One of the BCAAs, valine, can be glucogenic, meaning that it can lead to glucose production and potentially contribute to leaving ketosis behind.[1] But does that mean it will happen? Not necessarily, particularly if you're just an occasional supplement user.
Which leads us to your personality. You need to be VERY strong willed to follow this diet. It follows very strict rules and you need to be able to commit to this. It makes it hard to eat out with friends or eat with friends in general. It’s hard to find food that fits this diet in common restaurants, but and this takes us to the next point, your health goals might be more important.
Be aware of the effects of nightshades on your body; while they are permitted in ketosis, they cause inflammatory diseases like rheumatoid arthritis in sensitive people. Nightshades include tomatoes, tomatillos, peppers, okra, and eggplant. For a Bulletproof ketosis, also limit onions and garlic, which tend to be moldy and can disrupt your alpha brain waves. Plus, lightly cook any oxalate-heavy cruciferous and leafy greens.[1]
Typically you want to stay away from any brands that use filler ingredients like maltodextrin and dextrose, or high glycemic sweeteners like maltitol. Many low-carb products that claim low net carbs usually use these sugar alcohols. Many candies that are “sugar-free” also use these sweeteners. Avoid them where possible. These specific sweeteners respond in our body in a similar way sugar does.
Con: Results can vary depending on how much fluid you drink. By drinking more water, you dilute the concentration of ketones in the urine and thus a lower level of ketones will be detected on the strips. The strips don’t show a precise ketone level. Finally, and most importantly, as you become increasingly keto-adapted and your body reabsorbs ketones from the urine, urine strips may become unreliable, even if you’re in ketosis.
“A lot of folks find that batch cooking once or twice a week saves a tremendous amount of time and keeps you from spending every evening in the kitchen,” Weaver says. “When keto meal planning, you want to follow general good meal planning practices, like shopping for the week’s food all at once, which helps to save money, and prepping your vegetables when you get home. These 10 keto recipes are so good you’ll forget you’re on a diet.
"The keto diet is primarily used to help reduce the frequency of epileptic seizures in children. While it also has been tried for weight loss, only short-term results have been studied, and the results have been mixed. We don't know if it works in the long term, nor whether it's safe," warns registered dietitian Kathy McManus, director of the Department of Nutrition at Harvard-affiliated Brigham and Women's Hospital.
^ Freeman JM, Vining EP, Pillas DJ, Pyzik PL, Casey JC, Kelly LM. The efficacy of the ketogenic diet—1998: a prospective evaluation of intervention in 150 children. Pediatrics. 1998 Dec;102(6):1358–63. doi:10.1542/peds.102.6.1358. PMID 9832569. https://web.archive.org/web/20040629224858/http://www.hopkinsmedicine.org/press/1998/DECEMBER/981207.HTM Lay summary]—JHMI Office of Communications and Public Affairs. Updated 7 December 1998. Cited 6 March 2008.
Dinner: In a small sauce pan bring 2-3 cups of water to the boil. Cook a large egg in rolling boil for 5 minutes, then transfer to ice bath (a bowl with cold water and ice cubes in it). Wash and spin dry butter lettuce, top with sliced avocado and hemp seed. Serve soft boiled egg with cherry tomatoes, butter lettuce salad and mayonnaise as dressing.

Some people on a keto or low carb diet choose to count total carbs instead of net carbs. This makes it more difficult to fit in more leafy greens and low carb vegetables (which are filled with fiber), so you should only try that if you don’t get results with a net carb method. And, start with reducing sugar alcohols and low carb treats before deciding to do a “total carbs” method.
Because people with type 2 diabetes are at an increased risk for cardiovascular disease, there’s a specific concern that the saturated fat in the diet may drive up LDL, or “bad,” cholesterol levels, and further increase the odds of heart problems. If you have type 2 diabetes, talk to your doctor before attempting a ketogenic diet. They may recommend a different weight-loss diet for you, like a reduced-calorie diet, to manage diabetes. Those with epilepsy should also consult their doctor before using this as part of their treatment plan.
This is a wealth of information. My husband and I are starting the keto diet tomorrow and I knew nothing about it. When I sat down to look up information about it, I found this. Thank you! This is everything I need to know in one place. We are not as healthy as we’d like to be and I am optimistic this will help us obtain our goals, along with an exercise plan.
My Husband and I started doing Keto July 2018. We got over weight after we got out of the Marine Corps. It has been hard to workout because I became disabled, but my diet was not good. After our friend Amber recommended your site and support group, we found a lot of helpful information to get us started on a successful journey. So far it’s been one month and we have lost 18 pounds each!
What is the keto diet? Rather than relying on counting calories, limiting portion sizes, resorting to extreme exercise or requiring lots of willpower, this low-carb diet takes an entirely different approach to weight loss and health improvements. It works because it changes the very “fuel source” that the body uses to stay energized: namely, from burning glucose (or sugar) to dietary fat, courtesy of keto diet recipes and the keto diet food list items, including high-fat, low-carb foods.
In spite of the scientific evidence and real-life testimonials, not everyone is recommended to go on the ketosis diet. This highly specialized, extremely meticulous diet plan is suited to a particular dieter profile, and may also be harmful to some without the guidance of a doctor. But if performed correctly, the very low-calorie diet may be the only way for you to experience considerable, life-changing weight reduction.

It seems like everyone is talking about the keto diet — the high-fat, low-carb eating plan that promises to turn your body into a fat-burning machine. For that reason, keto has surged in popularity over the past year as a lose-weight-fast strategy. Thank Hollywood A-listers and professional athletes like Halle Berry, Adriana Lima, and Tim Tebow who’ve publicly touted the diet’s benefits, from shedding weight to slowing down aging. Here’s everything you need to know about going keto.

Sunnye thank you so much for your kind words and support! That's what I love about low-carb eating because I don't feel hungry and I always have energy even if I eat just twice a day 😊 The best way to keep all these guides without having to print them would be to buy my app. even without internet connection you'll have access to these and more through the KetoDiet Guide section and the KetoDiet Blog section (in this section it only needs to sync once). I hope this helps!
Here’s what we do know: The keto diet may be useful in treating symptoms of epilepsy, a seizure disorder. “The use of keto in treating epilepsy has the most evidence,” Angelone says. One study conducted by Johns Hopkins Medicine, for example, followed epileptic patients on the keto diet and found that 36 percent of them had a 50 percent reduction in seizures after three months on the diet, and 16 percent were seizure-free. However, experts aren't entirely sure why the keto diet has this affect, she adds.

Hi Barb, That can definitely be it. Losing when you are close to goal can be more difficult. It could also be that your body’s healthy weight is a little higher than what you’d like – which doesn’t mean you can’t lose, but makes it more difficult. If just eating Keto foods isn’t working, double check the macros for your weight and see if the amount you’re eating needs to be adjusted. You’ll find more help and support in our support group here.
“One of the best meal planning tips I’ve ever received is to structure breakfast and lunch so that you don’t have to think too much about it,” says Emily Bartlett, co-founder of Real Plans. “If you’re OK with repetition, it’s ideal to have a simple selection of recipes for breakfast—including some that can be taken on the go. For lunch, go ahead and use your leftovers with a fresh green salad, and be sure to include a dressing that you really love.” Before you make your keto diet menu, check out the 13 things doctors want you to know about the keto diet.
The keto diet also appears to help induce autophagy, which helps clear damaged cells from the body, including senescent cells that serve no functional purpose but still linger inside tissues and organs. In animal studies when rats are put on the ketogenic diet, autophagic pathways are created that reduce brain injury during and after seizures. (21)
Hi Maya. I LOVE your site!! Interesting, informative with fab recipes and ideas. Hubby and I have just started eating low carb and I have to say, we are not finding it too difficult and I already feel sooo much better!! I find the hardest part is choosing low carb veg, I feel as if we are not eating enough. Any suggestions on how to get more veggies into our diet?

Insulin is a hormone that lets your body use or store sugar as fuel. Ketogenic diets make you burn through this fuel quickly, so you don’t need to store it. This means your body needs -- and makes -- less insulin. Those lower levels may help protect you against some kinds of cancer or even slow the growth of cancer cells. More research is needed on this, though. 

Keto flu symptoms and side effects can include feeling tired, having difficulty sleeping, digestive issues like constipation, weakness during workouts, being moody, losing libido and having bad breath. Fortunately, these side effects don’t affect everyone and often only last for 1–2 weeks. (And yes, you CAN build muscle on keto.) Overall, symptoms go away as your body adjusts to being in ketosis.
Before starting, ask yourself what is really realistic for you, Mattinson suggests. Then get your doctor’s okay. You may also work with a local registered dietitian nutritionist to limit potential nutrient deficiencies and talk about vitamin supplementation, as you won’t be eating whole grains, dairy, or fruit, and will eliminate many veggies. “A diet that eliminates entire food groups is a red flag to me. This isn’t something to take lightly or dive into headfirst with no medical supervision,” she says.
All grains, even whole meal (wheat, rye, oats, corn, barley, millet, bulgur, sorghum, rice, amaranth, buckwheat, sprouted grains), quinoa and white potatoes. this includes all products made from grains (pasta, bread, pizza, cookies, crackers, etc.) sugar and sweets (table sugar, HFCS, agave syrup, ice creams, cakes, sweet puddings and sugary soft-drinks).

The ketogenic diet reduces seizure frequency by more than 50% in half of the patients who try it and by more than 90% in a third of patients.[18] Three-quarters of children who respond do so within two weeks, though experts recommend a trial of at least three months before assuming it has been ineffective.[9] Children with refractory epilepsy are more likely to benefit from the ketogenic diet than from trying another anticonvulsant drug.[1] Some evidence indicates that adolescents and adults may also benefit from the diet.[9]
Christopher D. Gardner, PhD; Alexandre Kiazand, MD; Sofiya Alhassan, PhD; Soowon Kim, PhD; Randall S. Stafford, MD, PhD; Raymond R. Balise, PhD; Helena C. Kraemer, PhD; Abby C. King, PhD, “Comparison of the Atkins, Zone, Ornish, and LEARN Diets for Change in Weight and Related Risk Factors Among Overweight Premenopausal Women,” JAMA. 2007;297(9):969-977. http://jama.jamanetwork.com/art icle.aspx?articleid=205916.
While nuts are a healthy option when you need a midafternoon pick-me-up, there are certain nuts to steer clear of on the keto diet. Nuts that are particularly high in carbs include cashews and pistachios. Avoid nuts of any kind that are coated with extra sugars or oils. Stick to the straightforward, low-carb nuts above if you're looking to achieve weight loss.
When trying to shift from a high carb diet to a ketogenic diet, cravings can definitely get strong. It’s always best to try to clean house before you start so that you don’t have food around you that can lead to cravings. We recommend that when switching to keto, you restrict using sweeteners completely for the first 30 days. It normally leads to breaking sugar addiction and ultimately not having cravings.

The fear, of course, is that many people don’t seek out information and support from regulated healthcare professionals before making major changes to their diet. Most newcomers are drawn to keto for its potential weight-loss benefits, and, while it remains a topic of debate among nutritional scientists, its proponents typically gloss over the unknowns. Keto advocates claim it gives them an edge for athletic performance by turning them into fat-burning machines.
It is very interesting to read about the keto/low card diet.I love to change my lifestyle as I an TYPE 2 Diabetic.I subscribed for a free printable low carb meal .The initial email stated that that I will receive an email for instructions to access the members area .Your free download will be there.However it is very deceiving ,I never got the 2nd email with instructions which is frustrating and not good .Hopefully this is not a way to get us to pay to get the printable version.
Another difference between older and newer studies is that the type of patients treated with the ketogenic diet has changed over time. When first developed and used, the ketogenic diet was not a treatment of last resort; in contrast, the children in modern studies have already tried and failed a number of anticonvulsant drugs, so may be assumed to have more difficult-to-treat epilepsy. Early and modern studies also differ because the treatment protocol has changed. In older protocols, the diet was initiated with a prolonged fast, designed to lose 5–10% body weight, and heavily restricted the calorie intake. Concerns over child health and growth led to a relaxation of the diet's restrictions.[19] Fluid restriction was once a feature of the diet, but this led to increased risk of constipation and kidney stones, and is no longer considered beneficial.[18]
All grains, even whole meal (wheat, rye, oats, corn, barley, millet, bulgur, sorghum, rice, amaranth, buckwheat, sprouted grains), quinoa and white potatoes. this includes all products made from grains (pasta, bread, pizza, cookies, crackers, etc.) sugar and sweets (table sugar, HFCS, agave syrup, ice creams, cakes, sweet puddings and sugary soft-drinks).

Sunnye thank you so much for your kind words and support! That's what I love about low-carb eating because I don't feel hungry and I always have energy even if I eat just twice a day 😊 The best way to keep all these guides without having to print them would be to buy my app. even without internet connection you'll have access to these and more through the KetoDiet Guide section and the KetoDiet Blog section (in this section it only needs to sync once). I hope this helps!


Hi Courtney, I’m currently working on a 21-Day Keto Meal Plan. Unfortunately, it’s super time-consuming. And after buying a keto cookbook yesterday and returning it the same day because it wasn’t well researched and the recipes clearly not created specifically for the Keto diet you wouldn’t want me to rush this. I want to make sure the Meal Plan is SPOT on and the recipes complement each other and make eating Keto easy. Give me another month or two and I’ll hopefully have more news on progress. Currently working on a rough sketch but still have to test all recipes and photograph them, too. You definitely don’t need nuts to be able to eat Keto. For now, I recommend to keep it as simple as possible. You can eat my 1-day meal plan 4 days a week and find other recipes you like to build another similar day and then keep switching between mine and the other.
"Drastically limiting your intake of glucose, the usual energy source for your cells, reduces insulin secretions in your body. Since low levels of glucose are coming in, the body uses what is stored in the liver and then the muscles," says Rania Batayneh, MPH, the author of The One One One Diet: The Simple 1:1:1 Formula for Fast and Sustained Weight Loss. After about three or four days, all of the stored glucose is used up.
Keep an eye on your intake for nut or seed based foods, as they can be quite high in inflammatory omega 6’s. These include items like almonds, walnuts, pine nuts, sunflower oil and corn oil. Eating fatty fish and animal meat, keeping snacking to a minimum, and not over-indulging in dessert items that are dense in almond flour is usually enough to keep your omega’s at normal ranges.
You can usually use a mix of multiple flours to get a realistic texture in baking recipes. Combining flours and experimenting with your baking can lead to much lower net carb counts in recipes. We think these lemon poppyseed muffins (a mix of almond flour and flaxseed meal) make a great texture when combined with the fats from the heavy cream and butter.

Use fat as a lever.  We’ve been taught to fear fat, but don’t! Both keto and low carb are high fat diets. Fat is our source of energy as well as satiety. The key to understand, though, is that fat is a lever on a low carb or keto diet. Carbs and protein stay constant, and fat is the one you increase or decrease (push the lever up or down) to gain or lose weight, respectively. So if your goal is weight loss, eat enough fat to be satisfied, but there’s no need to “get your fats in” once you’re satisfied.
Helps to control type 2 diabetes and other metabolic disorders: If you have diabetes, you may be turning to the ketogenic diet as a way to control your insulin and glucose levels. Early research shows that the ketogenic diet can help you significantly improve insulin sensitivity levels (11). One study even shows that some diabetes patients were able to stop taking their diabetes medication altogether while on the keto diet (12)!
The ketogenic diet has recently become very popular, and many food companies want to cash in by putting a “ketogenic” or “low carb” label on a new product. Be very cautious of special “keto” or “low-carb” products, such as pastas, chocolate bars, energy bars, protein powders, snack foods, cakes, cookies and other “low carb” or “ketogenic” treats. Read all labels carefully for natural low carb ingredients. The fewer ingredients the better.
Of the many benefits of a keto diet, weight loss is often considered No. 1., as it can often be substantial and happen quickly (especially for those who start out very overweight or obese). The 2013 study published in the British Journal of Nutrition found that those following a keto diet “achieved better long-term body weight and cardiovascular risk factor management when compared with individuals assigned to a conventional low-fat diet (i.e. a restricted-energy diet with less than 30 percent of energy from fat).” (2)
Therefore, when you’re following a ketogenic diet plan for beginners, your body is burning fat for energy rather than carbohydrates, so in the process most people lose weight and excess body fat rapidly, even when consuming lots of fat and adequate calories through their daily food intake. Another major benefit of the keto diet is that there’s no need to count calories, feel hungry or attempt to burn loads of calories through hours of intense exercise.
Giving the ketogenic diet a try? We’ve rounded up some of the best low-carb breakfast, dinner and side dish recipes that are higher in fat than protein, which can help you follow a keto diet plan. If you’re tracking your keto diet ratios, each recipe has nutritional information at the bottom, and some include ketogenic serving suggestions in the notes. Related collections: Low carb recipes, refined sugar free recipes, paleo recipes

The original therapeutic diet for paediatric epilepsy provides just enough protein for body growth and repair, and sufficient calories[Note 1] to maintain the correct weight for age and height. The classic therapeutic ketogenic diet was developed for treatment of paediatric epilepsy in the 1920s and was widely used into the next decade, but its popularity waned with the introduction of effective anticonvulsant medications. This classic ketogenic diet contains a 4:1 ratio by weight of fat to combined protein and carbohydrate. This is achieved by excluding high-carbohydrate foods such as starchy fruits and vegetables, bread, pasta, grains, and sugar, while increasing the consumption of foods high in fat such as nuts, cream, and butter.[1] Most dietary fat is made of molecules called long-chain triglycerides (LCTs). However, medium-chain triglycerides (MCTs)—made from fatty acids with shorter carbon chains than LCTs—are more ketogenic. A variant of the classic diet known as the MCT ketogenic diet uses a form of coconut oil, which is rich in MCTs, to provide around half the calories. As less overall fat is needed in this variant of the diet, a greater proportion of carbohydrate and protein can be consumed, allowing a greater variety of food choices.[4][5]
When you eat foods high in carbohydrates and fat, your body naturally produces glucose. Carbohydrates are the easiest thing for the body to process, and therefore it will use them first – resulting in the excess fats to be stored immediately. In turn, this causes weight gain and health problems that are associated with high fat, high carbohydrate diets (NOT keto).
What we know today as keto was developed as a clinical tool more than 100 years ago. In 1911, doctors noticed that children with epilepsy stopped having seizures after two days of absolute fasting, the point when their bodies would have been forced into ketosis. Scientists later noted that ketosis could be achieved through a low-carb, high-fat (LCHF) diet without the risk of infection and mortality rates associated with absolute fasting. Today, children resistant to anti-epilepsy drugs still follow ketogenic diets to prevent seizures, under the management of specialist dietitians.

The end result of the “ketone diet” is staying fueled off of circulating high ketones (which are also sometimes called ketone bodies) — which is what’s responsible for altering your metabolism in a way that some people like to say turns you into a “fat-burning machine.” Both in terms of how it feels physically and mentally, along with the impact it has on the body, being in ketosis is very different than a “glycolytic state,” where blood glucose (sugar) serves as the body’s energy source.
"Plenty of people jump right in, thinking all they have to do is cut carbs and increase fat. All of a sudden, they hit a wall and get 'keto flu.' They feel tired, lethargic, and experience headaches," Wittrock says. "The primary reason they get these symptoms is lack of the three primary electrolytes: sodium, potassium, and magnesium. If you're deficient in any of these, you'll suffer mentally and physically. This is the single biggest reason people fail on the keto diet." 
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