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The precise equivalence between calories and joules has varied over the years, but in thermochemistry and nutrition it is now generally assumed that one (small) calorie (thermochemical calorie) is equal to exactly 4.184 J, and therefore one kilocalorie (one large calorie) is 4184 J or 4.184 kJ. [10] [11]
The number of calories burned naturally in a day depends on factors like age, gender, weight and activity level. On average, an inactive adult may burn around 1,600 to 2,400 calories a day, while ...
It can take up to 20 hours of little physical output (e.g., walking) to "burn off" 17,000 kJ (4,000 kcal) [17] more than a body would otherwise consume. For reference, each kilogram of body fat is roughly equivalent to 32,300 kilojoules of food energy (i.e., 3,500 kilocalories per pound or 7,700 kilocalories per kilogram).
Daily supply of food energy per person in different countries, 1700 to 2018. Food consumption is the amount of food available for human consumption as estimated by Our World in Data.
1. Diet. Being in a calorie surplus — consuming more calories than you burn — can lead to overall weight gain and increase your chances of developing belly fat.
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Obese individuals burn more energy than lean individuals due to increase in the amount of calories needed to maintain adipose tissue and other organs that grow in size in response to obesity. [2] At rest, the largest fractions of energy are burned by the skeletal muscles, brain, and liver; around 20 percent each. [ 2 ]
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