A metabolic process called ketogenesis and a body state called ketosis are responsible. Ketosis is simply a normal metabolic pathway in which body and brain cells utilize ketones to make energy, instead of relying on only sugar (i.e., carbohydrate). In fact, humans developed an evolutionary ability to burn ketones as an adaptation to periods of food scarcity. 

This ingenious take on a hasselback potato is low-carb but now low on taste. It’s full of all the best potato fixins, like cheese, sour cream, green onions and, of course, bacon! (Just opt for turkey or beef bacon.) Instead of a carbohydrate-heavy potato, though, it’s all loaded into a firm, roasted zucchini. This is a terrific keto-friendly way to use up all that zucchini growing in the garden!
Some people don't do well in ketosis. As I mentioned above, you should check with your physician if you have any concerns about starting a ketogenic diet plan with pre-existing health conditions, especially if those conditions involve kidney or heart problems.  Although there is evidence that many people do well with reducing carb intake, I don't recommend going much lower than 10-20 carbs per day. The ketogenic is a very low carb diet, but it is not a zero carb diet. If you find (after at least a month on the diet) that you are one of the people who doesn't feel well at very low carb levels, adding enough carbohydrate in the form of sweet potatoes and other starchier vegetables back into your diet should bring you out of ketosis and resolve the issues. If you stay away from grains and rely on vegetables, a moderately higher carb content (60-100 grams/day) should result in health benefits. You won't be in ketosis of course, but still, you should feel better.  (I think grain consumption is one of the root causes of illness, but also acknowledge that everyone is different.)
You’ve probably heard about the low carb, high fat diet that’s so popular among actors and models, and with good reason: low carb diets offer proper nourishment with whole foods, while keeping your body burning fat for fuel. This is a great way to be, as it makes fat loss largely effortless! But where does this “ketogenic” word fit into the picture?
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.[18] On admission, only calorie- and caffeine-free fluids[36] 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.[18]
Yes, too much lean protein—think turkey and chicken—even lean fish—if you’re consuming that and vegetable only, without fat there, you are at risk of throwing yourself out of ketosis. Even eating egg whites without yolks greatly spikes insulin. So look to fatty proteins. Fatty cuts of beef, chicken WITH skin, fattier cuts of beef, lamb, and game. Chuck as opposed to 10% lean sirloin.
Our bodies are incredibly adaptive to what you put into it – when you overload it with fats and take away carbohydrates, it will begin to burn ketones as the primary energy source. Optimal ketone levels offer many health, weight loss, physical and mental performance benefits.1There are scientifically-backed studies that show the advantage of a low-carb, ketogenic diet over a low-fat diet. One meta-analysis of low-carbohydrate diets showed a large advantage in weight loss. The New England Journal of Medicine study resulted in almost double the weight loss in a long-term study on ketone inducing diets.
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