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The calorie is a unit of energy that originated from the caloric theory of heat. [1] [2] The large calorie, food calorie, dietary calorie, or kilogram calorie is defined as the amount of heat needed to raise the temperature of one liter of water by one degree Celsius (or one kelvin).
What is a calorie? Kilocalories (kcal) ... The three macronutrients—fat, carbs, and protein—contain a set number of calories per gram, according to the USDA. Carbs and protein have 4 calories ...
The dietary energy supply is the food available for human consumption, usually expressed in kilocalories or kilojoules per person per day. It gives an overestimate of the total amount of food consumed as it reflects both food consumed and food wasted. [1]
Fat has a food energy content of 38 kilojoules per gram (9 kilocalories per gram) proteins and carbohydrates 17 kJ/g (4 kcal/g). [2] Water makes up a large proportion of the total mass ingested as part of a normal diet but it does not provide any nutritional value.
The calorie is defined as the amount of thermal energy necessary to raise the temperature of one gram of water by 1 Celsius degree, from a temperature of 14.5 °C, at a pressure of 1 atm. For thermochemistry a calorie of 4.184 J is used, but other calories have also been defined, such as the International Steam Table calorie of 4.1868 J.
This data is presented in kilojoules, as most countries today use the SI unit kilojoules as their primary measurement for food energy intake, [4] with the exception of the USA, [5] Canada, [6] and the UK, which use kilocalories or both. [7]
kcal, kilocalorie (1,000 calories), a unit of energy (sometimes referred to as 1 Calorie, with a capital C, as opposed to a small c). Topics referred to by the same term This disambiguation page lists articles associated with the title KCAL .
A surge in the use of GLP-1 drugs is among the reasons a new report projects a calorie intake decline of 10 ... 100 to 800 less kilocalories per year, leading to an around 10 trillion kilocalorie ...