Gary D. Foster, Ph.D., Holly R. Wyatt, M.D., James O. Hill, Ph.D., Brian G. McGuckin, Ed.M., Carrie Brill, B.S., B. Selma Mohammed, M.D., Ph.D., Philippe O. Szapary, M.D., Daniel J. Rader, M.D., Joel S. Edman, D.Sc., and Samuel Klein, M.D., œA Randomized Trial of a Low-Carbohydrate Diet for Obesity ” NEJM, N Engl J Med 2003; 348:2082- 2090. http://www.nejm.org/doi/full/10.1056/NEJMoa022207.
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.
The ketogenic diet is super high in fat (about 80 percent of your daily calories), super low in carbohydrates (less than 5 percent of your calories), and moderate in protein (typically 15 to 20 percent of your calories). This is a pretty drastic departure from the generally recommended macronutrient distribution of 20 to 35 percent protein, 45 to 65 percent carbohydrates, and 10 to 35 percent fat.
This book is split into 3 parts: The Ketogenic Lifestyle, The 14-day Meal Plan, and the recipes. Before this book, I really didn't fully understand what a Ketogenic Diet was. Chapter 1 defines it for me in 4 words, Low-Carb, High-Fat. This diet promotes fresh whole foods and healthy fats & oils, and cuts out processed, chemically treated foods. It also tells you that when you start a Keto Diet, you'll most likely experience the Keto-Flu!
Aude, Y., A. S, Agatston, F. Lopez-Jimenez, et al. œThe National Cholesterol Education Program Diet vs a Diet Lower in Carbohydrates and Higher in Protein and Monounsaturated Fat: A Randomized Trial. JAMA Internal Medicine 164, no. 19 (2004): 2141“46. doi: 10.1001/archinte.164.19.2141. jamanetwork.com/journals/jamainternalmedicine/article-abstract/217514.
When you cut back on carbs or just haven't eaten in a while, your body looks for other sources of energy to fill the void. Fat is typically that source. When your blood sugar drops because you're not feeding your body carbs, fat is released from your cells and flood the liver. The liver turns the fat into ketone bodies, which your body uses as its second choice for energy.
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.
After the initial transition period (often referred to as the fat-adaptation or keto-adaptation period), most people find they gain a ton of mental and physical energy. They don't have energy crashes in the afternoons and they often sleep a bit less but wake up feeling refreshed. They also tend to eat less because they don't feel hungry or have cravings.
The ketogenic diet ” a high-fat and very low-carb eating plan ” can be tough to start. After all, it's likely a radical departure from the way you're eating now (a typical standard American diet is high in carbohydrates and processed foods). But many people are trying the keto diet, which puts your body in a state of ketosis. That's what happens when your body's carb-burning switch flips to a fat-burning one, a change that can cause weight loss and has even been credited with controlling diabetes. (1)
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