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Question

A healthy person eats the following diet, 5 gm sugar, 10 gm albumin, 10 gm ghee, 20 gm bread, 15 gm salad and 4 litres of water. How many calories is he likely to get?


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Solution

Calories

  1. Energy is represented as calories.
  2. These calories are obtained from the consumption of food and beverages and are used up in physical activities.
  3. A calorie can be defined as the amount of heat released to increase the temperature of one gram of water by one degree Celsius.

Step 1- Given data

The amount of macronutrients in the diet is given in the table below-

FoodMacronutrientAmount
SugarCarbohydrates5 g
AlbuminProteins10 g
GheeFats10 g
BreadCarbohydrates20 g
SaladCarbohydrates/ proteins15 g
Water-4 litres

Step 2- Applying the formula

Calories obtained from various macronutrients are given as follows-

  1. 4.0 Kcal/g - carbohydrate
  2. 4.0 Kcal/g - protein
  3. 9.0 Kcal/g - fat
  4. 0 Kcal/g - water

Step 3- Solving equations

Using simple multiplication, the energy from macronutrients in each type of food can be calculated as follows-

Energy from sugar= 5 x 4 Kcal = 20 Kcal

Energy from albumin= 10 x 4 Kcal = 40 Kcal

Energy from ghee= 10 x 9 Kcal = 90 Kcal

Energy from bread= 20 x 4 Kcal = 80 Kcal

Energy from salad= 15 x 4 Kcal = 60 Kcal (assumption- salad is made from proteins or carbohydrates)

Energy from water= 0

Total energy = 290 Kcal (addition of all above values).

Final answer

The healthy person will receive 290 Kcal by consuming the above diet.


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