During the 1920s and 1930s, when the only anticonvulsant drugs were the sedative bromides (discovered 1857) and phenobarbital (1912), the ketogenic diet was widely used and studied. This changed in 1938 when H. Houston Merritt, Jr. and Tracy Putnam discovered phenytoin (Dilantin), and the focus of research shifted to discovering new drugs. With the introduction of sodium valproate in the 1970s, drugs were available to neurologists that were effective across a broad range of epileptic syndromes and seizure types. The use of the ketogenic diet, by this time restricted to difficult cases such as Lennox–Gastaut syndrome, declined further.[10]
A macronutrient (macro) is one of three main sources of daily energy supply: carbohydrates, proteins and fats. All of them are essential in maintaining a healthy life and good exercise condition, but different diets and different occasions call for different balance between them and our keto calculator is here to help you estimate how much of each you need to consume to follow a keto dietary plan.

Another way to get into ketosis is by eating less than 20 grams of carbs — or a slice of bread — per day. So people on a ketogenic diet get about 5 percent of their calories from carbohydrates, 15 percent from protein, and 80 percent from fat. Note that that’s a much lower ratio of protein and a lot more fat than you’d get on other low-carb diets, but it’s this ratio that will force the body to derive much of its energy from ketones. If you eat too much protein, or too many carbs, your body will be thrown out of ketosis.

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Advocates of ketogenic diets for weight loss claim that ketogenesis can lead to a “metabolic advantage” that helps burn 10 times more fat and an extra 400 to 600 calories per day — the same as a vigorous session of physical activity. The main scientific model that’s used to explain that advantage is the ”carbohydrate-insulin hypothesis,” which has been promoted by experts like Harvard professor David Ludwig, Obesity Code author Jason Fung, journalist Gary Taubes, and pediatric endocrinologist Robert Lustig, among others.

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The benefits for the participants following the very low-carb diets weren’t nearly as dramatic as keto proponents claim. While the participants saw their insulin levels drop and stay low, they only saw a small increase in calorie burn, and that waned over time. (That short-lived increase in calorie burn amounted to about 100 extra calories per day — much less than the 400 to 600 calories promised by low-carb gurus.)

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Another common effect of the ketogenic diet is “keto flu”: fatigue, lightheadedness, and dizziness people feel when they greatly reduce their carb intake. This effect should go away after the body adjusts to the diet, but staying on keto for a long time could lead to kidney stones, high cholesterol, constipation, slowed growth (in young people), and bone fractures. We actually don’t know whether keto is safe in the long term.
It is possible to combine the results of several small studies to produce evidence that is stronger than that available from each study alone—a statistical method known as meta-analysis. One of four such analyses, conducted in 2006, looked at 19 studies on a total of 1,084 patients.[23] It concluded that a third achieved an excellent reduction in seizure frequency and half the patients achieved a good reduction.[18]
In the 1960s, medium-chain triglycerides (MCTs) were found to produce more ketone bodies per unit of energy than normal dietary fats (which are mostly long-chain triglycerides).[15] MCTs are more efficiently absorbed and are rapidly transported to the liver via the hepatic portal system rather than the lymphatic system.[16] The severe carbohydrate restrictions of the classic ketogenic diet made it difficult for parents to produce palatable meals that their children would tolerate. In 1971, Peter Huttenlocher devised a ketogenic diet where about 60% of the calories came from the MCT oil, and this allowed more protein and up to three times as much carbohydrate as the classic ketogenic diet. The oil was mixed with at least twice its volume of skimmed milk, chilled, and sipped during the meal or incorporated into food. He tested it on 12 children and adolescents with intractable seizures. Most children improved in both seizure control and alertness, results that were similar to the classic ketogenic diet. Gastrointestinal upset was a problem, which led one patient to abandon the diet, but meals were easier to prepare and better accepted by the children.[15] The MCT diet replaced the classic ketogenic diet in many hospitals, though some devised diets that were a combination of the two.[10]

About 20% of children on the ketogenic diet achieve freedom from seizures, and many are able to reduce the use of anticonvulsant drugs or eliminate them altogether.[18] Commonly, at around two years on the diet, or after six months of being seizure-free, the diet may be gradually discontinued over two or three months. This is done by lowering the ketogenic ratio until urinary ketosis is no longer detected, and then lifting all calorie restrictions.[46] This timing and method of discontinuation mimics that of anticonvulsant drug therapy in children, where the child has become seizure-free. When the diet is required to treat certain metabolic diseases, the duration will be longer. The total diet duration is up to the treating ketogenic diet team and parents; durations up to 12 years have been studied and found beneficial.[9] 

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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]

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Another common effect of the ketogenic diet is “keto flu”: fatigue, lightheadedness, and dizziness people feel when they greatly reduce their carb intake. This effect should go away after the body adjusts to the diet, but staying on keto for a long time could lead to kidney stones, high cholesterol, constipation, slowed growth (in young people), and bone fractures. We actually don’t know whether keto is safe in the long term.

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Thanks For all your hard work to making all this information available. I am new to Keto and my question is what is the easiest and quickest way to meet my fat requirements daily? I can figure from the nutrition facts info how many carbs I am eating but when you say 69% fats for a day I am confused how do I figure that? Same thing with the protein.

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The ketogenic diet has been studied in at least 14 rodent animal models of seizures. It is protective in many of these models and has a different protection profile than any known anticonvulsant. Conversely, fenofibrate, not used clinically as an antiepileptic, exhibits experimental anticonvulsant properties in adult rats comparable to the ketogenic diet.[58] This, together with studies showing its efficacy in patients who have failed to achieve seizure control on half a dozen drugs, suggests a unique mechanism of action.[56]

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Once you know what you will be eating on keto, you will probably be wondering how much of you should eat for each meal. Since meal size depends on the individual and his/her goals, we recommend using a calorie tracking app and our carb tracking guide to help you figure out the macronutrient content of your meals. As you track your macros, you will be able to figure out what adjusts you need to make to your diet to reach your goals.
Thermal Effect of Activity, also known as Activity Level, determines additional energy expenditure due to moving around and exercising. According to Lyle McDonald, broadly speaking, there are 5 categories / activity levels. We readjusted the multipliers from Lyle McDonald's book to better reflect different activity levels that work for most people.

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