Problem Janice W

Janice is a 40-year-old woman who is 162 cm tall and weighs 85 kg.

What is her BMI? Is this within the desirable range?

How much weight could she lose per megajoule energy deficit?

For the purpose of these calculations, you may assume that all of the weight loss will be adipose tissue: 15% water, 5% protein (with an energy yield of 17 kJ/g) and 80% triacylglycerol (with an energy yield of 37 kJ/g). You should ignore the (probably considerable) loss of muscle tissue to provide amino acids for gluconeogenesis.

Her total energy expenditure is 10 MJ/day. Assuming that she maintains her habitual level of physical activity, how much weight could she expect to lose per week:

1 if she reduced her food intake by 10%;

2 if she halved her food intake;

3 if she replaced all meals with a specially formulated very low-energy diet providing 2 MJ/day

4 if she starved completely?

For a woman age 40, and weighing 85 kg, BMR will be about 6.6 MJ/day. What is her PAL?

Rather than reducing her food intake, she decides that she would prefer to increase her physical activity. What would be the effect on her body weight per week of walking moderately briskly for 1 hour per day (PAR = 3.0)

After her exercise, she is thirsty, and drinks a pint of lager. The energy yield of lager is 130 kJ/100 mL. What is the effect of this drink on her overall energy balance and weight loss?


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