A fanatic physiology student weighing 80kg puts themselves on a strict diet of 4

Question

A fanatic physiology student weighing 80kg puts themselves on a strict diet of 4000 kcal per day and locks themselves away in the physiology lab for two weeks where they experimentally determine that their metabolism is using exactly 2400 kcal per day to do work, they also determkne that they are losing 1000 kcal per day as heat. Of all the rest of their energy goes directly into fat storage, how much will they weigh when theh emerge from the lab? (Show all work). A fanatic physiology student weighing 80kg puts themselves on a strict diet of 4000 kcal per day and locks themselves away in the physiology lab for two weeks where they experimentally determine that their metabolism is using exactly 2400 kcal per day to do work, they also determkne that they are losing 1000 kcal per day as heat. Of all the rest of their energy goes directly into fat storage, how much will they weigh when theh emerge from the lab? (Show all work).

Explanation / Answer

After all the work done and loss through heat, they have 600 Kcal of energy which is directly going into fat storage.

A kg of pure fat is 9000 kcal or 9000 Cal (capital C which means kcal or 1000 small c calories)

In trhe course of 2 weeks, about 8400kcal are converted into fat, which 0.93 Kg of mass.

They weigh around 80.93kg after they emerge.

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