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.  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.
Once ketone levels in the blood rise to a certain point, you officially enter into a state of ketosis. This state results in fairly rapid and consistent weight loss until you reach a healthier (and stable) body weight. Overall, people enter into ketosis at different rates, usually after 3–4 days of fasting or following a very low-carbohydrate diet (20 grams of net carbs or less) that forces the need for an alternative energy source. (3)
• Standard ketogenic diet (SKD) — SKD is the type I typically recommend for most people, because it is very effective. It focuses on high consumption of healthy fats: As I explain in my book, "Fat for Fuel," you should aim for having 70 to 85 percent of your total daily calories to come from healthy fats. For your protein intake, the general rule of thumb is to follow the formula of 1 gram of protein for every kilogram of your lean body mass.
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.
On a keto diet, weight loss can often be substantial and happen quickly (especially for those who start the diet 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).” (4)
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.
• Potassium: With the approved list of foods being so brief, you might not be getting in enough fruits and veggies on keto. One of the biggest impacts? A potassium deficiency—and all of the lovely constipation and muscle cramps that accompanies it. Aim to up your intake of foods like spinach, avocado, tomatoes, kale and mushrooms to get your potassium fix.
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.
Totally agree that it’s not something for everyone, though. Even one of the authors I read said he sometimes sneaks a french fry or a bite of cheesecake/ice cream, though he’s able to stop after just a little bit and it doesn’t throw him off horribly. Of course, that’s not license to eat junk all the time, but it does mean that once you’re well-adapted, you can sometimes indulge.
Net carbs are what we track when following a ketogenic diet. This calculation is pretty straightforward. Net Carbs = Total Carbs – Fiber. For example, one cup of broccoli has 6g of total carbs and 2.4g of fiber. That would mean one cup of broccoli has 3.6g of net carbs. We count Net Carbs because dietary fiber does not have a significant metabolic effect.
Can’t you take ketone supplements? No. While it is possible to elevate ketones by taking them, “without the low-carb stimulus, there is no net increase in ketone production, no decrease in insulin, and no net increase in fat oxidation,” says Volek. Don’t trust trainers or “body hackers” who say you can induce ketosis quickly without changing your diet.
Your body is still growing — In one study, epileptic children experienced a reduction in symptoms and improved cognitive performance when a ketogenic diet was introduced.49 However, this may have a negative effect on the growth of their bodies in the long run, according to a study published in the journal Developmental Medicine & Child Neurology.50
• Fighting inflammation — The human body can use both sugar and fat as fuel sources. However, the latter is preferred because it is a cleaner, healthier fuel that releases far fewer reactive oxygen species (ROS) and secondary free radicals. By eliminating sugar from your daily food consumption, you're decreasing your risk of developing chronic inflammation throughout your body.
On the other hand, the types of foods you’ll avoid eating on the keto, low-carb diet are likely the same ones you are, or previously were, accustomed to getting lots of your daily calories from before starting this way of eating. This includes items like fruit, processed foods or drinks high in sugar, those made with any grains or white/wheat flour, conventional dairy products, desserts, and many other high-carb foods (especially those that are sources of “empty calories”).
Therefore, when you’re following a ketogenic diet, 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 diet. 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.
Oh man, this is a great read. Entertaining and full or resources and digestible content even though it is a long article. But I appreciate the research you went through it. I remember 5 years ago researching about Keto diet took forever because of how spread out the sources were. This is great work as a guide. Thanks for the article. Before reading this article I thought the requirements were too strict, but now that I read it, I am already doing a third of that list. I am trying IF right now, but I think this will help me with my satiety problem with meals, plus help me with weight loss. Thanks for the motivation and information Steve. I am starting my plan of attack and try a Keto diet.
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