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The CRON-diet (Calorie Restriction with Optimal Nutrition) [1] is a nutrient-rich, reduced calorie diet developed by Roy Walford, Lisa Walford, and Brian M. Delaney. [2] The CRON-diet involves calorie restriction in the hope that the practice will improve health and retard aging, while still attempting to provide the recommended daily amounts of various nutrients. [3]
On the British North Greenland expedition, party members were issued rations that provided 4,164 calories per day. They included pemmican, butter, potato powder, cocoa, chocolate, sugar, rolled oats, dried milk, and biscuits. In 1959, it was determined that 4,800 calories per day is the optimum intake for sledging crews. [13]
Calorie restriction (also known as caloric restriction or energy restriction) is a dietary regimen that reduces the energy intake from foods and beverages without incurring malnutrition. [ 1 ] [ 2 ] The possible effect of calorie restriction on body weight management , longevity , and aging-associated diseases has been an active area of research.
As Olney had some original, unpublished recipes that he was determined to include, he agreed with Davidson and the latter's wife, Jane – also a food writer – to contribute recipes pseudonymously to a new journal that they would launch. [3] They secured the help of Britain's leading food writer, Elizabeth David, [4] and began publication. [3]
VLCD were not found to increase food cravings, and on the contrary, appear to reduce food cravings more than low-calorie diets. [ 29 ] Previous formulations (medical or commercial) of carbohydrate-free very low calorie diets provided 200–800 kcal/day and maintained protein intake, but eliminated any carbohydrate intake and sometimes fat ...
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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 (low-fat, low-carbohydrate, etc.), have been shown to be no more effective than one another.
This is because all fats contain some saturated fatty acids. For example, if a person chose fats with only 20% saturated fatty acids, setting fat intake at 35% of total calories would mean that 7% of calories would come from saturated fat. For this reason, the Institute of Medicine recommends consuming no more than 35% of calories from fat. [3]