I’ve been experimenting with MCT Oil Brain Octane. I have one questions. I’ve been eating about 20 – 25 gr. of carbs per day on a high fat, medium protein diet. I’m measuring ketones in the morning before taking the MCT and after. I’ve been taking btw. 1-2 tbsp of MCT Brain Octane with butter (Bulletproof coffee) – I measure again after 30 min., 1hr, 2 hrs. and don’t see a raise in my blood ketones. Anything I’m missing, would love to hear your thoughts, Ben. – Thx I’m measuring with Precision Xtra and Ketonix Red.

So which MCT to pick? Brain Octane (pure C8) provides the fastest rise in ketones and burns the cleanest, with minimal gut irritation. XCT oil is more affordable but works more slowly with less direct cognitive effects. The capric acid C10 in XCT Oil doesn’t break down into ketones as quickly as pure caprylic C8, but capric acid C10 is more affordable, so you can save money by going with the XCT oil. XCT oil still goes to brain energy, just not as quickly as Brain Octane. Both can be used for energy without processing by the liver, unlike many other fats and oils.
In addition, most studies that compare carbohydrate utilization with fat utilization fail to take into account the fact that full “fat adaptation” that allows you to gain all the benefits of using fat as a fuel actually takes time – often more than four weeks – and up to a couple years. But since most studies that compare fat and carbohydrate burning are short-term, you rarely see the benefits of this kind of fat adaptation actually fleshed out in research. Instead, the average research participant begins the study in a non-fat adapted state, gets either a high fat or high carb diet, then launches into exercise. But in an ideal study, that person would have followed either a high-fat or high-carb diet for many months before getting their fat burning capability investigated.

1. If a set number ketones in the blood is an indicator that my body has transitioned to ketosis and not necessarily the cause (the cause being limited access to glycogen because of limited carb intake) then how does using exogenous ketones put me in ketosis as opposed to mimic being in ketosis (because when measuring blood ketones suddenly there are more because I put them there, I didn’t create them)?
Hi Cyn, The numbers are general guidelines but will vary depending on many factors, such as activity level, insulin resistance, weight and more. There is no single magic number, just conventional recommendations that are a good starting point. I will have a macro calculator coming soon that will help determine what is best for each person, but even then it’s an approximation. The only way to know for sure is to test. If keto is your goal, it’s usually best to start lower and then see if you can stay in ketosis when increasing.
Achieving ketosis is a pretty straightforward, but it can seem complicated and confusing with all of the information out there.4If you want to learn more about ketosis and the scientific process around it, you can visit a very in-depth discussion about on Dr. Peter Attia’s website. Here’s the bottom line on what you need to do, ordered in levels of importance:
Me, I was a lot of things before I was keto: vegan, high starch, skinny, an Adderall abuser, paleo, Catholic, raw till 4, pescatarian, etc. The reason I went high fat/low carb was because some very smart-sounding people on the internet told me that I could “hack my body” and eat some fun things (bacon) if only I’d cut out a food group that was probably giving me constipation and cancer anyway.

For the keto gurus who serve as keto's staunchest evangelicals, conversations swirl around oft-repeated talking points, and any sense of negativity is quickly batted away. I spoked to several "gurus.” The claims they made are already on most low-carb blogs: It’s gonna suck at first, but it’s Worth It. Fat makes you full. Blood sugar will go down. Insulin will be on point. You’ll realize that which has sat dormant in your body for too long -- a demigod. Devoid of carbs, your body will reconstruct in such a way that Zeus descended from parted clouds to congratulate you on your blood test results.


Keto-adaption is a complex set of metabolic processes in which the body shifts from using primarily glucose for energy to using largely ketones and fat for energy. Achieving ketosis doesn’t mean the body is maximizing the use of these ketones; it takes longer than a few days for the body to get used to burning fat and ketones as its predominant fuels.
Burns fat: You can drop a lot of weight — and quickly — on the keto diet.[3] Ketones suppress ghrelin — your hunger hormone — and increase cholecystokinin (CCK), which makes you feel full.[4] Reduced appetite means it’s easier to go for longer periods without eating, which encourages your body to dip into its fat stores for energy. Learn more here about the keto diet and weight loss. 
Note: Because you'll be excluding some major food groups on the keto diet (grains, many fruits) you should definitely think about taking a multivitamin—especially one that contains folic acid, which helps your body make new cells and is often found in enriched breads, cereals, and other grain products, says Julie Upton, R.D., cofounder of nutrition website Appetite for Health.
I am not an athlete. I am a mid 30’s male with a sedentary lifestyle. I am 5’10” and 250lbs. I have mild hypertension, high triglycerides, and pre-diabetes. I have eaten whatever I want and as much as I want for years. I have recently started walking/jogging 3-4 times a week, taking fish oil, and eating significantly less carbs plus added fish and steak. Is this diet appropriate and safe for me? 

The low glycaemic index treatment (LGIT)[49] is an attempt to achieve the stable blood glucose levels seen in children on the classic ketogenic diet while using a much less restrictive regimen. The hypothesis is that stable blood glucose may be one of the mechanisms of action involved in the ketogenic diet,[9] which occurs because the absorption of the limited carbohydrates is slowed by the high fat content.[5] Although it is also a high-fat diet (with approximately 60% calories from fat),[5] the LGIT allows more carbohydrate than either the classic ketogenic diet or the modified Atkins diet, approximately 40–60 g per day.[18] However, the types of carbohydrates consumed are restricted to those that have a glycaemic index lower than 50. Like the modified Atkins diet, the LGIT is initiated and maintained at outpatient clinics and does not require precise weighing of food or intensive dietitian support. Both are offered at most centres that run ketogenic diet programmes, and in some centres they are often the primary dietary therapy for adolescents.[9]
Variations on the Johns Hopkins protocol are common. The initiation can be performed using outpatient clinics rather than requiring a stay in hospital. Often, no initial fast is used (fasting increases the risk of acidosis, hypoglycaemia, and weight loss). Rather than increasing meal sizes over the three-day initiation, some institutions maintain meal size, but alter the ketogenic ratio from 2:1 to 4:1.[9]
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).
Before I highly suggest that you don’t purge your bread products, I’m going to play devil’s cautious-and-hardly-audible advocate and say, yes, drastically cutting carb and sugar intake can have health benefits: it can increase levels of good cholesterol, reduce blood sugar, and all that stuff. But you can accomplish these same goals by, for example, replacing Wonder bread with a healthier carb. There's no need to side-eye the croutons your server forgot to omit like they’re a physical manifestation of the Seven Deadly Sins.
Thanks so much for the reply! One more question about the LivingFuel SuperGreens…I had very bad GI issues with VEGA Protein in 2011 when I tried it (quit after half a container), which scared me away from the vegetarian proteins with greens in them. Is this drastically different from VEGA? Or seeing that pea is the primary source of protein should I look towards something else? Thanks again!
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!
Before I highly suggest that you don’t purge your bread products, I’m going to play devil’s cautious-and-hardly-audible advocate and say, yes, drastically cutting carb and sugar intake can have health benefits: it can increase levels of good cholesterol, reduce blood sugar, and all that stuff. But you can accomplish these same goals by, for example, replacing Wonder bread with a healthier carb. There's no need to side-eye the croutons your server forgot to omit like they’re a physical manifestation of the Seven Deadly Sins.

It also means that if you’re a very active athlete or exercise enthusiast and you’re following “trickle-down” advice from the sedentary or less active ketosis experts to eat less than 40g of carbs per day, you’re making a big mistake when it comes to your hormonal balance, and you need to up your carbohydrate intake to 100-200g of carbs per day. You’d be surprised at how easy it is (if you’re a very active person) to stay in ketosis on this level of carbohydrate intake. Go ahead. Do Ketonix breath testing to prove me wrong. You can eat boatloads of carbohydrates at night and be back in ketosis within just two to three hours. When you combine that with the cutting-edge tricks you’re about to learn, you’ll find that you can toss hormonal issues out the window, get into ketosis, have your cake, and eat it too. Literally. 

Hello, I have a quick question. I’ve been on keto since March 2017. Already lost about 45 pounds, down to 140 at 5’7 and about 16.4% fat. I take a magnésium cap each morning to be sure I got enough and eat at least 1 serving of baby spinach a day with olive oil or fatty dressing that have no carbs. My last meal is always between 5 and 9 pm (mostly around 6) and I don’t eat back before 12pm the next day on week days and not before next dîner on week end. Fasting isn’t something new to me and when I read it help getting in ketosis I continued.

"If you're going to do keto, there's a better and a worse way to do it," registered dietician Kim Yawitz told Everyday Health. "Loading your plate with meats, and especially processed meats, may increase your risk for kidney stones and gout... High intake of animal proteins makes your urine more acidic and increases calcium and uric acid levels. This combination makes you more susceptible to kidney stones, while high uric acid can increase your risk for gout."
But beyond that, experts aren't convinced that the keto diet has any other scientifically-proven health benefits. In fact, it may have some distinct downsides. If you follow the keto diet incorrectly, for example (like by eating lots of saturated fats, versus healthy unsaturated fats), you're at risk of raising your cholesterol levels. “The best strategy to keep your heart healthy is to get as much fat as possible from unsaturated sources such as olive, avocado and canola oils, nuts, seeds, avocados, and olives," says Ansel.
Can’t get enough of avocados? You now have a great excuse to eat more of them. A ½-cup serving of the creamy fruit has almost 12 g of fat and only 2.6 g of net carbs. Avocados are also low in calories (about 138 for the same serving), making them an ideal snack in between meals. One serving also has about 6.4 g of dietary fiber (25.6 percent daily value, or DV), 404 milligrams (mg) of potassium (8.6 percent DV), and only 2.8 g of sugar. Try topping your salad with cubed avocado for a keto-friendly lunch.
Around this time, Bernarr Macfadden, an American exponent of physical culture, popularised the use of fasting to restore health. His disciple, the osteopathic physician Dr. Hugh William Conklin of Battle Creek, Michigan, began to treat his epilepsy patients by recommending fasting. Conklin conjectured that epileptic seizures were caused when a toxin, secreted from the Peyer's patches in the intestines, was discharged into the bloodstream. He recommended a fast lasting 18 to 25 days to allow this toxin to dissipate. Conklin probably treated hundreds of epilepsy patients with his "water diet" and boasted of a 90% cure rate in children, falling to 50% in adults. Later analysis of Conklin's case records showed 20% of his patients achieved freedom from seizures and 50% had some improvement.[10]
It’s tough to find keto criticism in a world of trend-driven search engine optimization, so I was positively delighted to find James Fell’s article “Keto Is the Dumbfuck Diet Du Jour, But That Won’t Last.” Turns out he’s been featured in The Washington Post, The Guardian, Chicago Tribune, and Men’s Health, and has committed a decade to diet myth-busting after watching his mother struggle with her weight all his life. I gave him a call after reading his poem “Much Ado About Stuffing.”

In nondiabetics, ketosis (also called nutritional ketosis) is regulated and controlled in the body so that ketone levels never reach the harmful levels associated with diabetic ketoacidosis. Ketoacidosis is an acute, life-threatening condition that occurs in severely uncontrolled diabetes (mainly type 1) when ketones rise to massive, supranormal levels.
A systematic review in 2018 looked at 16 studies on the ketogenic diet in adults. It concluded that the treatment was becoming more popular for that group of patients, that the efficacy in adults was similar to children, the side effects relatively mild. However, many patients gave up with the diet, for various reasons, and the quality of evidence inferior to studies on children. Health issues include high levels of low-density lipoprotein, high total cholesterol, and weight loss.[24]
What a great post. I thought i would add about the selection of food you eat on keto and that everyone is different. Some food gives you energy and some doesnt, this varies person to person. I started and quit keto 3 times before i managed to find my balance. The first few times it made be poorly, from the shock of diet change. However, you can wean yourself into the diet which i did the last time when i had the most success.
"Some people stop working with me because they're not going to be proven wrong. You’re dissing their religion," said Libby, a registered dietician who asked that her full name not be used because of the private hate messages she's received from the community.   “If there was a diet or a pill or something that really was this miracle diet weight-loss thing that lasted and was healthy for you, we wouldn't have all these different diets all the time, there wouldn't be health complications, there wouldn't be so much controversy about it and the first time that you'd be learning about it wouldn't be on a 3pm talk show."
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.
It’s also important to note there have been no long-term studies on the ketogenic diet, nor has there been research that details what may happen to the body if it’s in a constant state of ketosis itself. But given how the body needs carbs to function properly, diets that are based on fat burning may lead to nutritional deficiencies, and supplements and multivitamins are recommended because you’re cutting out entire food groups, warns Alyssa Rothschild, RDN, who is in private practice in New York City.
I am not a doctor and this is not to be taken, interpreted or construed as medical advice. Please talk with a licensed medical professional about this. These are just my own personal thoughts and not a prescription or a diagnosis or any form of health care whatsoever. Your mother can avoid the "keto flu" by adding sufficient sodium to her diet and staying well hydrated, especially in the first few days of starting to reduce carbohydrates. The keto flu could also be called “carbohydrate withdrawal symptoms” because of the effects on hormonal and electrolyte balance. If you're not already using a device to measure ketones in your body, I recommend this one: https://bengreenfieldfitness.com/ketonix As far as how much to take, it all depends….you can actually do more than two servings per day if you want, and you can experiment to see how many servings your body should handle. You should know that it would be very difficult to overdose on ketones. They are water soluble, so any excess ketones will be eliminated mainly via the urine. Hope this helps!
So which MCT to pick? Brain Octane (pure C8) provides the fastest rise in ketones and burns the cleanest, with minimal gut irritation. XCT oil is more affordable but works more slowly with less direct cognitive effects. The capric acid C10 in XCT Oil doesn’t break down into ketones as quickly as pure caprylic C8, but capric acid C10 is more affordable, so you can save money by going with the XCT oil. XCT oil still goes to brain energy, just not as quickly as Brain Octane. Both can be used for energy without processing by the liver, unlike many other fats and oils.

The day before admission to hospital, the proportion of carbohydrate in the diet may be decreased and the patient begins fasting after his or her evening meal.[19] On admission, only calorie- and caffeine-free fluids[37] are allowed until dinner, which consists of "eggnog"[Note 8] restricted to one-third of the typical calories for a meal. The following breakfast and lunch are similar, and on the second day, the "eggnog" dinner is increased to two-thirds of a typical meal's caloric content. By the third day, dinner contains the full calorie quota and is a standard ketogenic meal (not "eggnog"). After a ketogenic breakfast on the fourth day, the patient is discharged. Where possible, the patient's current medicines are changed to carbohydrate-free formulations.[19]
This is why Gaspari Nutrition chose highly branched cluster dextrin for what we consider to be the gold standard of recovery and performance drinks. This high molecular weight carbohydrate has a special helical structure, which gives it unique properties unlike many of the corn starches or polysaccharides out there. I'll be real with you and say this stuff isn’t cheap, but you certainly pay for what you get, and highly branched cluster dextrin is unlike any carb source I've found – especially if you want to control blood sugar levels and gut issues.

In the first week, many people report headaches, mental fogginess, dizziness, and aggravation. Most of the time, this is the result of your electrolytes being flushed out, as ketosis has a diuretic effect. Make sure you drink plenty of water and keep your sodium intake up.6One of the fathers of keto, Dr. Phinney, shows that electrolyte levels (especially sodium) can become unbalanced with low carb intake.
A small Feb. 20, 2017, study looked at the impact of a six-week ketogenic diet on physical fitness and body composition in 42 healthy adults. The study, published in the journal Nutrition & Metabolism, found a mildly negative impact on physical performance in terms of endurance capacity, peak power and faster exhaustion. Overall, researchers concluded, “Our findings lead us to assume that a [ketogenic diet] does not impact physical fitness in a clinically relevant manner that would impair activities of daily living and aerobic training.” The “significant” weight loss of about 4.4 pounds, on average, did not affect muscle mass or function.
Great article! As someone who just started a “ketogenic diet” two weeks ago, I am opting to hold off on using ketone supplements for the following reason. You state how “Keto-adaptation occurs when you have shifted your metabolism to relying on fat-based sources, instead of glucose (sugar) sources, as your primary source of fuel.” If the goal is to “switch” our body’s energy supply to ketones and one uses supplemental ketones, how do they really ever know if their body has successfully accomplished this goal if they are using supplemental ketones? Aren’t they getting a false sense of ketosis if their blood or breath tests show them above 0.5 millimolar through the use of the supplements? I understand that it may take me longer to reach ketosis naturally but I guess I see it was worth it to truly reap all of the benefits that you outline in your article.
Elevated blood ketone levels is the sign of ketosis, while certain subjective symptoms can also signal ketosis. Increased mental clarity, less brain fog, and diminished appetite are fairly common among people in ketosis. The ketogenic diet specifically has its own assortment of symptoms. Fortunately, the negative symptoms such as constipation, diarrhea, and bad breath are often temporary and tend fade as your body becomes better at fat burning and naturally producing ketones. The positive symptoms of ketosis coincide with higher levels of ketones in the blood. This may occur after several weeks of adhering to the ketogenic diet or very shortly after ingesting exogenous ketones.
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