A Compass and A Key
When deciding around how many calories will make up your diet, whether you plan on shedding pounds or bulking up, there is one clear ideology people of any political stripe must follow: ignore government derived guidelines for calories.
The reason to ignore them is simple. They are largely arbitrary and for some people can be truly harmful. The reason for this is simple math. There is an equation anyone can use to find out their resting metabolic rate (RMR) is. Your RMR is how many calories you will burn during a day by simply existing. To complete the equation all you need is a calculator and an ounce of patience.
The equation you will use is called the Mifflin-St. Jeor Equation, created by someone I do not plan on researching. The equation is a reliable way to understand what your caloric needs are going to be each day. For men, the equation looks like this:
(9.99 x weight in kilograms) + (6.25 x height in centimeters) – (4.92 x age in years) + 5 = RMR
For women, the equation looks like this:
(9.99 x weight in kilograms) + (6.25 x height in centimeters) – (4.92 x age in years) -161 = RMR
Once you have found your RMR, there is one step left. Multiply your RMR number by one of these values based on your exercise level:
Sedentary (little to no exercise)= 1.2
Lightly Active (light exercise 1-3 times a week)= 1.375
Moderately Active (moderate exercise 6-7 times a week)= 1.55
Very Active (hard exercise 6-7 times a week)= 1.725
Extra Active (very active and have a physical job)= 1.9
Here is what my equation looks like:
(9.99 x 71.36) + (6.25 x 177.8) – (4.92 x 24) +5 = 1,706 calories
1,706 x 1.55= 2,644 calories.
So for a moderately active male who weighs 157lbs, is 5’10”, and happens to be 24 years old (aka- me), 2,000 calories per day would be a fine caloric target for weight loss but a terrible target for weight maintenance and an even worse target for weight gain. Keep in mind, whatever percentage of calories I want to get from carbohydrates, proteins, or fats is going to be different now than the percentage listed on food packaging as a 2,000 calorie diet is not what my body needs.
If this is starting to feel complex, that’s because it is. Identifying your caloric needs with your exercise needs with your weight loss or gain goals with your timeline is hard, and it’s why so many people turn to systems and plans created by someone else. If you want information on what I recommend click on the “Ask Me Anything” link and check out next week’s entry for how to apply the concept from today.
Conversions:
1 inch= 2.54 cm
1 pound= .453 kg
Bryant, Cedrix X. and Gren, Daniel J. (Eds.). (2010). ACE’s Essentials of Exercise Science for Fitness Professionals. San Diego, CA: American Council on Exercise.