Question

a college student has noticed that his pants are getting hard to button. A quick check on the scale in the gym confirms a 7-pound weight gain over the last 12 weeks. The main change in Charles’s diet is his alcohol intake—he now typically drinks 5 or 6 12-ounce beers on Friday and Saturday nights and drinks another 3 or 4 beers during the week. How many extra calories per week is Charles consuming? If each pound of weight gain results from a surplus of 3500 kcal, can Charles’s weight gain be explained by his beer consumption?

Answer 1

If each pound of weight gain results from a surplus of 3500kcal.

Charles’s gained 7 pound weight over the last 12 weeks,
which means 7 x 3500 = 24500 kcal gained from last 12 weeks

Per week gained = 24500 / 12 = 2041.66667 kcal

As per Charles’s alcohol intake, he used drinks 5 or 6, 12 ounce beers on Friday and Saturday and 3 or 4 ounce beer during week.

So, totally per week 8 or 10, 12 ounce beer, he is consuming.

Here

12 ounce beer has 153 calories

Charles consuming extra calories per week is

If he consumes 8, 12 ounce beer per week means, he is consuming 8 x 12 ounce (153 calories) = 1224 calories.

If he consumes 10, 12 ounce beer per week means, he is consuming 10 x 12 ounce (153 calories) = 1530 calories.