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Old 07-31-2005, 05:30 AM   #1  
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Lightbulb Formula To Determine Caloric Intake

This formula will give you a ball park figure. To get an exact figure would require testing in a lab.

How to Calculate Your Daily Calorie Needs
Harris-Benedict Formula

The Harris Benedict equation is a calorie formula using the variables of height, weight, age, and gender to calculate basal metabolic rate (BMR). This is more accurate than calculating calorie needs based on total body weight alone. The only factor it omits is lean body mass and thus the ratio of muscle-to-fat a body has. Remember, leaner bodies need more calories than less leaner ones. Therefore, this equation will be very accurate in all but the very muscular (Harris-Benedict will under-estimate calorie needs) and the very fat (Harris-Benedict will over-estimate calorie needs).

Two Steps to Determine Daily Calorie Needs

* First, determine your BMR.
* Second, apply the Activity Multiplier.

Harris Benedict Formula for Women - STEP 1

BMR = 655 + (9.6 X weight in kilos) + (1.8 X height in cm) - (4.7 X age in years).

Notes:
1 inch = 2.54 cm.
1 kilogram = 2.2 lbs.

Example of BMR
You are 32 years old
You are 5 feet 4 inches tall (162.5 cm)
Your weight is 185 pounds (84 kilos)
Your BMR is 655 + (806) + (291) - (150) = 1602 calories

Harris Benedict Formula for Women - STEP 2

To determine your total daily calorie needs, now multiply your BMR by the appropriate activity factor, as follows:

* If you are Sedentary - little or no exercise
Calorie-Calculation = BMR X 1.2
* If you are Lightly Active (light exercise/sports 1-3 days/week)
Calorie-Calculation = BMR X 1.375
* If you are Moderately Active (moderate exercise/sports 3-5 days/week)
Calorie-Calculation = BMR X 1.55
* If you are Very Active = BMR X 1.725 (hard exercise/sports 6-7 days/week)
Calorie-Calculation = BMR X 1.725
* If you are Extra Active (very hard daily exercise/sports & physical job or 2X day training)
Calorie-Calculation = BMR X 1.9

Total Calorie Needs Example

If you are sedentary, multiply your BMR (1602) by 1.2 = 1922
Your total daily calorie requirement is therefore 1922 calories.
This is the total number of calories you need in order to MAINTAIN your current weight.

To lose weight decrease your caloric requirement by a MAXIMUM of 20%.


Harris J, Benedict F. A biometric study of basal metabolism in man. Washington D.C. Carnegie Institute of Washington. 1919.
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Old 07-31-2005, 08:40 AM   #2  
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I need to add a cautionary note to the above post. Formulas like Harris-Benedict and others have the advantage of looking and sounding scientific and reliable. But many of us here at 3FC have found them to be wildly inaccurate. Personally, I don’t pay much attention to them except to say – I wish it were so!

Harris-Benedict gives my BMR as 1326 (and Schofield as 1400). Based on the fact that I exercise 6 – 7 days a week for an average of 90 minutes, plus work as a personal trainer, I picked the ‘very active’ multiplier (hard exercise/sports 6-7 days/week) though I think I might even qualify for 'extra active' (very hard daily exercise/sports & physical job or 2X day training). The result is that I should theoretically be able to maintain my weight at 2287 calories. Unfortunately, that many calories spells certain and quick weight gain for me. In order to get my actual highest maintenance calories (1600), I’d have to use the ‘sedentary’ multiplier, though I don’t think that ‘sedentary’ is a particularly accurate description of my lifestyle.

It can be fun to play around with numbers for calories burned and metabolic rates, but be aware that all these calculators are guesstimates. In my experience working with overweight women, the numbers given are often way too HIGH. It can be frustrating for our members to calculate out the perfect number for weight loss, only to have it not work.

My alternative suggestion is to honestly track calories – weighing and measuring and journaling every bite, lick, and taste – to see how YOUR unique body reacts to a particular calorie level. This way you can tweak and devise your own personal diet plan that works for YOU.
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Old 07-31-2005, 06:15 PM   #3  
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Software you can download like Fitday PC (no, I don't sell it, just love it) can be very helpful also in calculating your BMR and caloric needs. Some people find it isn't accurate for their bodies, but it's so on target for me that it's scary. Another good one (IMO) is Dietpower ... and there are others.
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