Dieting is the practice of eating food in a regulated way to decrease, maintain, or increase body weight, or to prevent and treat diseases such as diabetes and obesity. As weight loss depends on calorie intake, different kinds of calorie-reduced diets, such as those emphasising particular macronutrients, have been shown to be no more effective than one another. As weight regain is common, diet success is best predicted by long-term adherence. Regardless, the outcome of a diet can vary widely depending on the individual.
The Atkins diet is a low-carbohydrate fad diet devised by Robert Atkins in the 1970s, marketed with claims that carbohydrate restriction is crucial to weight loss and that the diet offered "a high calorie way to stay thin forever".
Ketosis is a metabolic state characterized by elevated levels of ketone bodies in the blood or urine. Physiological ketosis is a normal response to low glucose availability, such as low-carbohydrate diets or fasting, that provides an additional energy source for the brain in the form of ketones. In physiological ketosis, ketones in the blood are elevated above baseline levels, but the body's acid–base homeostasis is maintained. This contrasts with ketoacidosis, an uncontrolled production of ketones that occurs in pathologic states and causes a metabolic acidosis, which is a medical emergency. Ketoacidosis is most commonly the result of complete insulin deficiency in type 1 diabetes or late-stage type 2 diabetes. Ketone levels can be measured in blood, urine or breath and are generally between 0.5 and 3.0 millimolar (mM) in physiological ketosis, while ketoacidosis may cause blood concentrations greater than 10 mM.
Joel Fuhrman is an American celebrity doctor who advocates a plant-based diet termed the "nutritarian" diet which emphasizes nutrient-dense foods. His practice is based on his nutrition-based approach to obesity and chronic disease, as well as promoting his products and books. He has written books promoting his dietary approaches including the bestsellers Eat to Live, Super Immunity, The Eat to Live Cookbook, The End of Dieting (2016) and The End of Heart Disease (2016). He sells a related line of nutrition-related products.
Low-carbohydrate diets restrict carbohydrate consumption relative to the average diet. Foods high in carbohydrates are limited, and replaced with foods containing a higher percentage of fat and protein, as well as low carbohydrate foods.
The ketogenic diet is a high-fat, adequate-protein, low-carbohydrate dietary therapy that in conventional medicine is used mainly to treat hard-to-control (refractory) epilepsy in children. The diet forces the body to burn fats rather than carbohydrates.
David S. Ludwig is an American endocrinologist and low-carbohydrate diet advocate in Boston, Massachusetts. He is a promoter of functional medicine.
The China Study: The Most Comprehensive Study of Nutrition Ever Conducted and the Startling Implications for Diet, Weight Loss and Long-term Health is a book by T. Colin Campbell and his son, Thomas M. Campbell II. The book argues for health benefits of a whole food plant-based diet. It was first published in the United States in January 2005 and had sold over one million copies as of October 2013, making it one of America's best-selling books about nutrition.
A very-low-calorie diet (VLCD), also known as semistarvation diet and crash diet, is a type of diet with very or extremely low daily food energy consumption. VLCDs are defined as a diet of 800 kilocalories (3,300 kJ) per day or less. Modern medically supervised VLCDs use total meal replacements, with regulated formulations in Europe and Canada which contain the recommended daily requirements for vitamins, minerals, trace elements, fatty acids, protein and electrolyte balance. Carbohydrates may be entirely absent, or substituted for a portion of the protein; this choice has important metabolic effects. Medically supervised VLCDs have specific therapeutic applications for rapid weight loss, such as in morbid obesity or before a bariatric surgery, using formulated, nutritionally complete liquid meals containing 800 kilocalories or less per day for a maximum of 12 weeks.
Intermittent fasting is any of various meal timing schedules that cycle between voluntary fasting and non-fasting over a given period. Methods of intermittent fasting include alternate-day fasting, periodic fasting, such as the 5:2 diet, and daily time-restricted eating.
The South Beach Diet is a popular fad diet developed by Arthur Agatston and promoted in a best-selling 2003 book. It emphasizes eating food with a low glycemic index, and categorizes carbohydrates and fats as "good" or "bad". Like other fad diets, it may have elements which are generally recognized as sensible, but it promises benefits not backed by supporting evidence or sound science.
Mark P. MattsonPh.D., is an adjunct professor of neuroscience at the Johns Hopkins School of Medicine.
Weight management refers to behaviors, techniques, and physiological processes that contribute to a person's ability to attain and maintain a healthy weight. Most weight management techniques encompass long-term lifestyle strategies that promote healthy eating and daily physical activity. Moreover, weight management involves developing meaningful ways to track weight over time and to identify ideal body weights for different individuals.
Jorge Cruise is a Mexican author, fitness trainer and proponent of intermittent fasting and low-carbohydrate dieting. He is the author of The Cruise Control Diet (2019) as well as books on The New York Times bestseller list: The 100 (2013), The Belly Fat Cure (2010), Body at Home (2009), The 12-Second Sequence (2009), The 3-Hour Diet (2006), and 8 Minutes in the Morning (2002).
Mark Adam Hyman is an American physician and author. He is the founder and medical director of The UltraWellness Center and was a columnist for The Huffington Post. Hyman was a regular contributor to the Katie Couric Show until the show's cancellation in 2013. He writes a blog called The Doctor’s Farmacy, which examines many topics related to human health and welfare. He is the author of several books on nutrition and longevity, including Food Fix, Eat Fat, Get Thin, and Young Forever.
Jonkheer Alexander "Dr. Xand" van Tulleken is a British doctor and TV presenter. He is best known for presenting the CBBC children's series Operation Ouch! with his identical twin brother Chris, and the Channel 4 show How to Lose Weight Well.
Graham Simpson is a medical doctor and advocate of “natural” and proactive medicine and health. He graduated from the University of the Witwatersrand Medical School in Johannesburg, South Africa, and is board certified in internal medicine and emergency medicine. He was also a founding member of the American Holistic Medical Association (AHMA).
Steven R. Gundry is an American physician and low-carbohydrate diet author. He is a former cardiac surgeon and cardiac surgery researcher who runs an experimental clinic investigating the impact of diet on health. Gundry is the author of The Plant Paradox: The Hidden Dangers in "Healthy" Foods That Cause Disease and Weight Gain, which promotes the controversial lectin-free diet.
Javid Abdelmoneim is a British-born physician and television presenter. He is best known for his work with Médecins Sans Frontières which has seen him respond to crises in Iraq (2009), Haiti (2010), South Sudan (2014), Sierra Leone (2014), Syria (2017–2018) and also aboard the Aquarius (2016), a search and rescue ship run in partnership between MSF and SOS Mediteranée. Most recently, Abdelmoneim served as a Member of the Board of Trustees (2015–2021) and was also elected the youngest serving president and chair of the Board (2017–2021) for MSF UK.
