“I really believe that the more informed you are about the benefits of a healthy bite versus the chain reaction that you’re going to put into effect in your body when you take that bite — you just suddenly don’t want to make that choice for yourself anymore. It’s beyond willpower at that point; it’s become a desire to do something good for yourself.” — Christie Brinkley
Short for “ketogenic diet,” this eating plan is all about minimizing your carbs and upping your fats to get your body to use fat as a form of energy, says Scott Keatley, R.D., of Keatley Medical Nutrition Therapy. While everyone's body and needs are slightly different, that typically translates to: 60 to 75 percent of your calories from fat, 15 to 30 percent of your calories from protein, and 5 to 10 percent of your calories from carbs.
Sweeney does not stick to a specific macronutrient balance when he begins his own ketogenic diet plan. Instead, he maintains a diet that includes no more than 50 grams of carbohydrate per day. When he goes over 0.6 on the ketone meter (a device used to measure blood for the presence of ketones) he goes up to 70 grams of carbohydrates and takes a ketone supplement.
Because the ketogenic diet alters the body's metabolism, it is a first-line therapy in children with certain congenital metabolic diseases such as pyruvate dehydrogenase (E1) deficiency and glucose transporter 1 deficiency syndrome,[34] which prevent the body from using carbohydrates as fuel, leading to a dependency on ketone bodies. The ketogenic diet is beneficial in treating the seizures and some other symptoms in these diseases and is an absolute indication.[35] On the other hand, it is absolutely contraindicated in the treatment of other diseases such as pyruvate carboxylase deficiency, porphyria and other rare genetic disorders of fat metabolism.[9] A person with a disorder of fatty acid oxidation is unable to metabolise fatty acids, which replace carbohydrates as the major energy source on the diet. On the ketogenic diet, their body would consume its own protein stores for fuel, leading to ketoacidosis, and eventually coma and death.[36]
Calories: The nutrient intake on a ketogenic diet typically works out to about 70-75% of calories from fat, 20-25% from protein, and 5-10% from carbohydrate on a daily basis.  However, these ratios don't work well at very low calorie or very high calorie daily totals.  And although calorie counting is not required, it is important to understand how macronutrient percentages can be affected by caloric intake, so you may want to read my page on calorie counting to get more information on this subject. Again, low or very high calorie intake will skew the percentages of macronutrients. It is also important to remember that fats are super high-calorie foods, especially if you have extra weight to lose and you are doing keto to lose weight. Read my plateau page if you are not reaching your weight loss goals.
You may also be a great candidate for the Keto diet if you experience migraines, joint pain, muscle weakness or mental fatigue. In addition, "Keto diet can be beneficial for mental health conditions like depression, autism and Alzheimer's". Other than that, "you can also follow this diet plan if you're trying to get pregnant since it improves fertility", she notes.
A systematic review in 2018 looked at sixteen 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 (LDL), high total cholesterol, and weight loss.[23]
Julie Hand is a certified holistic health and nutrition counselor (Institute for Integrative Nutrition), personal fitness trainer (National Personal Training Institute), and yoga teacher (Kripalu Center for Yoga & Health). Though she can’t resist trying every science-backed health tip, she also has a penchant for crystals and astrology (don’t judge). You can find her walking the beach (coffee in hand, of course) and practicing the ukulele on weekends.
It is not necessary to be as strict with children as you would be for yourself. Children are generally more insulin sensitive than adults, which means their bodies can deal with sugars and carbs more efficiently. Focus on whole foods, good sources of protein, lots of good fats (essential for brain development), and getting carbs from nutrient-dense sources.
What's more, studies that have examined the efficacy of the ketogenic diet for weight loss have a few questionable similarities. First, they use the keto diet in conjunction with an extremely low-calorie plan (under 1,000 per day!), which makes it difficult to determine what caused the actual weight loss. Second, they all question the long-term impact on your heart of eating mostly saturated fat, not to mention how hard (and boring) it is to eat mainly coconut oil and butter for months on end.

There are so many tricks, shortcuts, and gimmicks out there on achieving optimal ketosis – I’d suggest you don’t bother with any of that. Optimal ketosis can be accomplished through dietary nutrition alone (aka just eating food). You shouldn’t need a magic pill to do it. Just stay strict, remain vigilant, and be focused on recording what you eat (to make sure your carb and protein intake are correct).
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