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A low-carbohydrate diet (often "low-carb") is an eating plan that limits the intake of carbohydrates, emphasizing a proportionally greater consumption of proteins or fat. Originating from concepts dating back to the 19th century, these diets have surged in popularity in recent decades, mainly due to their effects in promoting weight loss and purported benefits in managing various metabolic disorders.

While carbohydrates traditionally serve as one of the primary energy sources for the human body, low-carb diet proponents argue that by limiting carbohydrate consumption, the body is forced into a metabolic state where it burns stored fat more efficiently. This metabolic state, called ketosis, and the shift from glucose to fat as a primary energy source, is believed to underpin many of the potential advantages of low-carbohydrate diets....

A calorie is a calorie

Low-carb diets are hotly debated among nutritionists, researchers, and clinicians. Critics often point to potential nutrient deficiencies, long-term sustainability concerns, and other health risks as downsides. Meanwhile, supporters cite numerous studies highlighting benefits ranging from weight loss to improved blood sugar control.

History
The concept of limiting carbohydrate intake for health benefits isn't new. In fact, low-carbohydrate diets can trace their roots back to the mid-19th century when British undertaker William Banting wrote Letter on Corpulence, which detailed his success with a reduced carbohydrate intake. Over the years, the idea resurfaced in various forms until the late 20th and early 21st century when the approach gained widespread attention and acceptance, partly due to the success of diets like the Atkins Diet.

Definition
There exists a broad spectrum of low-carbohydrate diets, ... Ketogenic Atkins Paleolithic

Carnivore diet

Controversy
Gary Fettke Robert Lustig Atkins.. ... Robert Lustig Nina Teicholz Gary Taubes

EAT Lancet Tim Noakes