The burning of food via cellular respiration must provide the average adult approximately kilocalories per day.

-250
-1,000
-1,300 to 1800
-2,200

2,200 Kcal

Explanation: An average adult requires at least 2,200 Kcal in a day for maintaining his/her weight and carrying on everyday activities. The average calorie requirement varies person to person depending on numerous factors such as person’s sex, age, height, weight, and level of physical activity. In each sex and age category, the higher limit of the range is for individuals who have active lifestyle and the lower limit of the range is for individuals who have sedentary lifestyle. The reductions in basal metabolic rate occur with aging, which reduce the calorie needs for adults as they age.

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