3a. A person decreases his carbohydrate intake by 50 g per day and supplements h

Question

3a. A person decreases his carbohydrate intake by 50 g per day and supplements his diet with fat (50 g per day additional). What is the effect on caloric intake as a result of this dietary shift? If this person was in energy balance before the diet shift, what will be the consequences?

b. A person wants to lose 5 pounds (11kg) of excess fat. If they reduce their caloric intake by 200 kcal per day and increase their physical activity by 300 kcal per day, how long will it take to lose 5 pounds?

PLEASE RATE. THANK YOU.

Explanation / Answer

Solution

a) Rule: " 1 gram of carbohydrate = 4 calories and 1 gram of fat = 9 calories"

So when the person removes 50 grams of carbohydrates, he/she removes 200 calories (50*4) from his diet and by adding 50 grams of fat, he/she adds 450 calories (i.e. 50*9) in his diet.

So net he is adding 250 calories (450 from fat - 200 from carbohydrates) more to his balanced diet. So to balance energy again, he has to burn an extra 250 calories per day.

b) ***Note: 5 pounds is not equal to 11 kg***

As per part a), we know, 1g of fat = 9 calories

So, to lose 5 pounds (or 2268 grams) weight, he/she has to burn 20,412 calories (2268*9).

Now, he has removed 200 calories per day from his diet and is burning 300 calories per day by physical activity, therefor he is burning a net of 500 calories (300+200) per day

And, number of days required to burn 20,412 calories = calories to be burnt / calories burnt per day

= 20412 / 500

=40.824 or ~ 41 days

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