Tuesday, November 17, 2009

How Many Calories Should I Eat?

That's what I wanted to know. I only knew that I'm supposed to eat 500 calories less per day to lose 1 lb per week. But I didn't really know how to figure out the right amount and how to figure in the amount of exercise.

Then I came across an equation that works. It's called the Harris-Benedict equation and you can read more about it on Wikipedia: Harris-Benedict equation

Wikipedia says:

The BMR calculation for women is:

BMR = 655 + ( 4.35 x weight in pounds ) + ( 4.7 x height in inches ) - ( 4.7 x age in years )

Then you factor in the exercise you do:

Wikipedia says:

Little to no exercise Daily calories needed= BMR x 1.2

Light exercise (1-3 days per week) Daily calories needed= BMR x 1.375

Moderate exercise (3-5 days per week) Daily calories needed= BMR x 1.55

Heavy exercise (6-7 days per week) Daily calories needed= BMR x 1.725

Very heavy exercise (twice per day, extra heavy workouts) Daily
calories needed= BMR x 1.9

Finally an answer!

My Own Starting Equation:

BMR = 655 + ( 4.35 x 199) + (4.7 x 67.5) - ( 4.7 x 32)

BMR = 655 + 865.65 + 317.25 - 150.4 = 1687.5 BMR - calories I need to eat to remain same weight

1687.5 x 1.725 (I exercise 7 days a week) = 2910 calories to remain the same weight

But since I want to lose weight I'm going to eat 1000 calories less:

So: 1910 calories.

That sounds like a lot of calories to anyone who has ever dieted, but the body needs calories for fuel, and when you're exercising it needs enough calories so you don't become faint or dizzy.

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