Calories Needed Weight Loss |
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Calories needed per day to lose weight
To determine the number of calories needed to lose weight we must first try to calculate the calories required by the body. Only then is it possible to slowly lower the calories needed by the body until we are in a negative energy balance. The gradual reduction in calories required encourages the body to slowly use up fat stores rather than burning up protein from muscle - this is what often happens when calories are cut too quickly and results in a lowered metabolism!
There are several accurate formulas to choose from. We will show the Schofield equation below. Equations for estimating basal metabolic rate (BMR) for adult men and women. Men: 10 - 17 years BMR = 17.7 x W + 657 SEE = 105 18 - 29 years BMR = 15.1 x W + 692 SEE = 156 30 - 59 years BMR = 11.5 x W + 873 SEE = 167
Women:
10 - 17 years BMR = 13.4 x W + 692 SEE = 112 18 - 29 years BMR = 14.8 x W + 487 SEE = 120 30 - 59 years BMR = 8.3 x W + 846 SEE = 112
Key: W = Body weight in Kilograms - convert body weight here! SEE = Standard error of estimation
The SEE value means the calculated BMR could be this number of calories out, in other words either too many or too little. As an example, if you are very muscular and possess more lean weight than an average person of the same height and weight, then you may have to add the SEE value to the BMR calculated. The simple reason is more lean weight means more calories needed! An example calculation of calories needed for a woman aged 30 years and weighing 70 kilograms (154 pounds)... 30 - 59 years BMR = 8.3 x W + 846 SEE = 112
BMR = 8.3 x 70 + 846
BMR = 1427 calories needed for basal metabolic rate!
Now remember the SSE, this is 112. So if the woman is about average body fat percentage then we could say this value is about right. However, look at her age!
She is at the lower end of the scale (30 - 59 years) for this reason we may have to add the SEE value to the calculation simply because younger people generally need more calories. Therefore the real BMR for this woman is more likely to be around 1539! The BMR is only part of the total calories needed for each day. We now need to work out the calories required for all activity levels. Click here to find your Physical Activity Ratio! Check out another calculation for working out BMR and total daily calorie requirements
The Schofield equation above was taken from HMSO (1991) - Report on health and social subjects 41, dietary reference values for food, energy and nutrients for the United Kingdom.
* Always seek approval from a qualified dietician before introducing new foods or starting any new diet. Please read our Terms!! |
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