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The average person's diet contain about 55% carbohydrates, 30% fat, and 15% protein. On the keto diet, you eat a whole lot more fat, and a lot less carbs: 80% of the diet is comprised of fat, 15% is protein, and a mere 5% of calories come from carbohydrates. For someone on a 1,500-calorie diet, that translates to 19 grams of carbohydrates per day, which is less than what you find in one medium-sized apple.

The current hypothesis is that the brain functions differently on ketones than on glucose, and this is what causes certain brains to reduce epileptic seizures. I would then also hypothesize that certain people who feel that “brain fog” lifted on ketosis is due to either placebo effect OR their brain actually functioning differently on ketones vs glucose.


Ketogenesis has existed as long as humans have. If you eat a very low amount of carbohydrates, you starve your brain of glucose, its main fuel source. Your body still needs fuel to function, so it taps into your reserve of ketones, which are compounds the liver creates from fat when blood insulin is low. This process is known as ketosis: It’s like when a hybrid car runs out of gas and reverts to pure electricity.
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.

• Multiple Sclerosis: In a small 2016 study, patients with multiple sclerosis (MS) were put on a ketogenic diet. After six months, they reported improved quality of life, as well as physical and mental health improvements. Before doctors or researchers can make a connection between keto and MS, they need bigger sample sizes and more thorough research. Still, the preliminary findings are exciting.


This short-term hack originated in clinical settings to help obese patients shed excess fat quickly.  It was described in Dr. Atkins’ New Diet Revolution for the same purpose. The diet consists of 1000 calories or less of almost entirely fat, with a little protein. This can be useful for people who have been on a ketogenic diet for at least three weeks, or who have had a weight plateau that has lasted at least three weeks. Since it’s so high in fat, you have to be keto-adapted for it to be effective, not just in ketosis.


And good news for coffee addicts: you can still have your morning cup of joe. You’ll just need to adjust what you stir into it. Switch out flavored creamer for the real deal—full-fat heavy whipping cream, which has only 1 gram of carbs per tablespoon. If you want to give your java a jolt of sweet, stir in a low-carb sweetener that uses sugar alcohols. But if you can skip the sweet, even better. In time, you’ll retrain your palate to not crave a sugary start to the day.
Following a diet that drastically restricts carbohydrates requires carefully monitoring your food choices to ensure you are meeting your nutritional needs. Working together with a registered dietitian can make sure you follow this diet in a healthy manner without increasing your risk for complications or negative side effects. You can find a registered dietitian at EatRight.org.
Steve, thank you for the amazing article! Your style of writing was so funny and easy to follow, and had me actually laughing out loud so many times! Low carb is the only diet that has ever worked for me. I freaking love it. I got away from it, though, and started eating too much sugar again. My daughter is getting married next year, and I have to squeeze this badonkadonk into a cute dress next year, hopefully without looking like a mama hippo, so low carb it is. I see the basic program is the same, but there have been some advancements with the science of the diet which is great. I’m excited to get at it! Today is day 1 for me. Wish me luck; I’m going in…..
IF is choosing a smaller window of time during the day to consume your daily allowance of calories, and using the rest of the time to fast, or not eat anything. During the fasting period, you can still have beverages, provided they contain no calories. Most people choose a 6 or 8 hour window to eat in, and usually do this by skipping breakfast to only have lunch and dinner.
If you’d like to try intermittent fasting, it’s best to start by gradually decreasing your feeding window. Start with not eating for a 12 hour stretch, including the time that you’re sleeping. For example, you could stop eating at 8 in the evening, then have breakfast at 8 in the morning. Ultimately, you’ll want to be mostly done with digestion by the time you go to bed, and not be hungry until late morning, so for most people a feeding window of 10am to 6pm would be a good goal.
Some people just cut out the bulk of carbohydrates from major sources like breads, pastas, and sodas, and these people are on a Low Carbohydrate plan. There isn’t anything particularly strict about it, it’s more about being mindful of overall carb intake, often without tracking. This can be a good place to test the waters of a keto diet, though many people on this kind of plan never get into ketosis without further restriction.
Since then, it’s the same 10-15 pounds that I keep losing and gaining back. Love your mantras- I’ve written a few down in my journal and some just ring in my head like a music track- never two in a row!! Can’t outrun your fork!! The one about losing weight, looking good in the mirror, then world domination is my favorite. With keto, it gets me fantastic and very quick results and I go with a recarb meal (not recarb day) once a week. Eat a little more carbs after workouts. Now with the strips, I can see if what I’m doing post-workout keeps me in keto. I wish this article had come out a couple of months ago- I did hours of research before going keto, much of it bland, definitely no animal gifs. Thanks for all your resources- they are so eye-opening and so motivating (and funny)!! Great knowing that if I feel like I need the boost with 1-1 coaching it is available. Keep up the outstanding work!
Beverages: It’s common to become dehydrated on the keto diet. Your insulin levels drop when you restrict carbs, and low insulin makes it harder for your body to retain sodium and water.[9] Drink plenty of plain water, and sip on bone broth to replenish electrolytes, especially during the first couple of weeks when your body is adjusting to the new diet.
One of the most common side effects of starting the ketogenic diet is the “keto flu.” This term describes the often unpleasant, fatigue-inducing symptoms that occur as the body adjusts from a high-carbohydrate to a low-carbohydrate diet. During the keto flu, the body’s stored glucose begins depleting, and the body starts adapting to producing and utilizing ketones as energy. (2)
Some people just cut out the bulk of carbohydrates from major sources like breads, pastas, and sodas, and these people are on a Low Carbohydrate plan. There isn’t anything particularly strict about it, it’s more about being mindful of overall carb intake, often without tracking. This can be a good place to test the waters of a keto diet, though many people on this kind of plan never get into ketosis without further restriction.
Cyclical ketogenic diet: The Bulletproof Diet falls into this category. You eat high fat, low carb (less than 50 grams of net carbs a day) five to six days of the week. On day seven, you up your carb intake to roughly 150 grams, during what’s called a carb refeed day. Carb cycling this way helps you avoid the negative effects some people experience when they restrict carbs long term, like thyroid issues, fatigue and dry eyes.[10] [11] Full ketosis isn’t for everyone, and adding carbs such as sweet potatoes, squash, and white rice one day a week keeps your body systems that need some amount of carbs functioning properly.
There are several types of the keto diet, but essentially, to achieve a state of ketosis, you have to severely reduce the amount of carbs you eat. (You can use this ketogenic calculator to create a custom food plan.) Data suggest the average American man over age 20 consumes 47.4 percent of his daily calories from carbs, and the average American woman over age 20 consumes 49.6 percent of her daily calories from carbs. (3) But in the classic ketogenic diet, which was originally used for the management of seizure disorders, 80 to 90 percent of calories come from fat, 5 to 15 percent come from protein, and 5 to 10 percent come from carbohydrates.
A lot of changes are happening in your body and you’re going to feel it! The first five to seven days can be pretty rough, but your body is getting over its dependency on sugar. During this time of transition it is essential that you supplement electrolytes. Your body is flushing out lots of water, and with that goes electrolytes. The Keto Flu can be greatly reduced if you add sodium, potassium and magnesium to your diet. Check out our supplements page for a list of electrolyte supplements we recommend. Stay on course and you’ll start feeling better in no time!
The macronutrient ratios for the keto diet can range between 65-90% fat, 5-25% protein, 4-10% carbohydrates depending on the person. Those are actually pretty large ranges, so they deserve an explanation.  There are a lot of details that come into play to calculate your macros for ketosis including your current weight, target weight, exercise frequency, and more.
That's why I co-wrote the "Fat for Fuel Ketogenic Cookbook" alongside renowned Australian celebrity chef Pete Evans. This book combines research-backed medical advice with delicious, kitchen-tested recipes that will help make shifting to fat-burning much easier. Whether you're just a budding cook or a master chef, there's a delicious meal waiting to be prepared that'll take your health to the next level.
The ketogenic diet for weight loss is based on the idea that driving the body into ketosis will maximize fat loss. Ketosis is a normal metabolic process that occurs when the body does not have enough glucose stores for energy. When these stores are depleted, the body resorts to burning stored fat for energy instead of carbs.  This process produces acids called ketones, which build up in the body and can be used for energy. (2)

According to the USDA, a 100-gram serving of red tomatoes has 3.89 grams of carbohydrates.43 You may add this fruit to your ketogenic diet safely and gain its beneficial nutrients, particularly lycopene. Researchers from Ohio State University suggest that this antioxidant may help protect your skin from sun damage, which may result in a lowered risk of skin cancer tumors.44
It can be very difficult to obtain some of the very high levels of blood ketones on this table - especially as you become "fat adapted" or "keto adapted" or whatever you want to call it.  Once your body is efficient at using ketones, it makes only what it needs.  Beginners may see very high levels of ketones, and then they see them drop off.  This isn't because you are making a mistake and are out of ketosis - your body is no longer overproducing them.
The hallmark of a ketogenic diet is being in ketosis for extended periods of time, and is achieved by carbohydrate restriction. While there isn’t a strict prohibition of artificial sweeteners, grains, and manufactured foods, there is a strong preference in the community to lean towards natural, whole foods. Keto is for overall health, and weight loss is a welcome side effect for many people.
Your glycogen stores can still be refilled while on a ketogenic diet. A keto diet is an excellent way to build muscle, but protein intake is crucial here. It’s suggested that if you are looking to gain mass, you should be taking in about 1.0 – 1.2g protein per lean pound of body mass. Putting muscle on may be slower on a ketogenic diet, but that’s because your total body fat is not increasing as much.5Note that in the beginning of a ketogenic diet, both endurance athletes and obese individuals see a physical performance for the first week of transition.
I find myself in the kitchen a lot more, but that's a good thing, especially since I'm gaining more energy and endurance from the diet. Since I live alone I've also invested in more plastic bags and containers. When I use one of the recipes I divide the finished product into the number of servings, eat one and bag the rest for the freezer or fridge.
Although studies have shown that the keto diet can reduce seizures for children with epilepsy, there is no evidence indicating that keto helps with other brain disorders or improves mental cognition, according to Harvard Health Publishing. Some studies show that keto may lower blood sugar for people with type 2 diabetes, but there is not enough long-term research to determine whether it’s safe and effective for diabetics.
I like it – and I’m surprised I like it. I’m only down 5 lbs. after a month but I’m down 3 inches on my waist and 2 inches on my hips. I do feel better physically and I love not being hungry! I used to be that person who could eat pasta like a lumberjack – now I often don’t even finish my food. I have had a hard time sticking to 20 net carbs, I usually end up in the high 20’s somewhere, but I’m in ketosis according to the testing strips. It’s much harder to stick to 20 net as a vegetarian. Everything you eat has some level of carbs and they do add up. But overall, this is the only thing I’ve lost any weight or inches on in about 7 or 8 years. Starvation used to work until I hit 45 and then, forget it, I could eat 700 calories a day and not lose a pound. I’m so excited *something* is actually working.

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