How many kilocalories do I need on daily basis This is a que

How many kilocalories do I need on daily basis? This is a question that most people who are healthy and maintain their body weight do not have to worry about. They maintain energy balance (calories in versus calories out) without thinking about it. But for those who have more difficulty maintaining their weight, estimating daily energy needs and keeping their kilocalorie intake in check may help them.

Anna and her sister Theresa weighed almost the same until Anna went to college. Everybody has heard about the freshman 15! And yes, it is happening to Anna. Her jeans seem to be tight, and she does not even want to step on the scale. What happened? What can she do? Anna and Theresa are only one year apart; both are 5 feet 4 inches tall and before Anna left home they both weighed 121 pounds. Both of them played on their school volleyball team, rode bikes to school, and were moderately active teenagers. Now in college, Anna studies way more than she did during high school, and so far she has not found friends to exercise with. She is not happy with her situation, but for now her life has become sedentary.

1) What are Anna’s total daily energy needs based on her desired body weight and level of physical activity that will allow her to maintain her precollege body weight?

2) Anna’s sister, Theresa, is still at high school and lives at home. She still maintains her moderately active teenage lifestyle. What are Theresa’s daily energy needs to maintain her weight?

Solution

1) What are Anna’s total daily energy needs based on her DESIRED body weight (121 pounds)? and, What is the level of physical activity that will allow her to maintain her precollege body weight?

To determine Anna’s daily energy requirement:

Women Basal Metabolic Rate (BMR) = 665 + (9.6 x weight in Kg) + (1.8 x height in cm) – (4.7 x age in years)

Anna, 15 years, 162.5 cm (5’4”), 54.8 Kg (121 pounds)

Anna\'s BMR = 665 + (9.6 x 54.8 kg) + (1.8 x 162.5 cm) – (4.7 x 15 years) = 665 + (526.08) + (292.5) – (70.5) = 1413.08 cal/day

Total daily energy expenditure (TDEE): BMR x Activity factor

Anna’s life has become sedentary with no exercise so TDEE is as follows

Activity factor for sedentary = 1.2

TDEE = 1413.08 x 1.2 = 1695.69 calories/day is the amount of energy Anna needs to go back to weight 121 pounds while being sedentary.

The level of physical activity that will allow her to maintain her precollege body weight would be moderate (activity factor = 1.55).

2) Anna’s sister, Theresa, is still at high school and lives at home. She still maintains her moderately active teenage lifestyle. What are Theresa’s daily energy needs to maintain her weight?

Theresa, a year younger than Anna, therefore 14 years old, 162.5 cm (5’4”), 54.8 Kg (121 pounds)

Theresa\'s BMR = 665 + (9.6 x 54.8 kg) + (1.8 x 162.5 cm) – (4.7 x 14 years) = 665 + (526.08) + (292.5) – (65.8) = 1417.78 calories/day

Total daily energy expenditure (TDEE):

Theresa is moderately active -> Activity factor for moderately active = 1.55

TDEE = 1417.78 x 1.55 = 2197.56 calories/day are required for Theresa to maintain her current body weight.