Total Caloric Expenditure: Part 3-Activity Expenditure

From my previous posts, we have learned the calculation for daily total caloric expenditure. Let’s review:

Total Caloric Expenditure = Resting Metabolic Rate, (RMR), + Thermal Effect of Food + Activity Expenditure.

We learned how to correctly calculate our Resting Metabolic Rate for our current body weight. We could have taken that formula a step further by first calculating our Lean Body Mass, or our body’s lean weight which is comprised of the combined weight of our bones, muscles, organs, and water mass, but we can save that for a future post as it is not entirely necessary to get you started.

We have also learned that our bodies use energy to digest and process the food we eat. Energy, in the form of calories, and how to calculate that.

So now let’s move on and discuss the third and final value of our equation, Activity Expenditure. According to the National Federation of Professional Trainers, (NFPT), the average adult burns approximately 500 calories per day performing normal daily activities. If you consider yourself a little more or less active than most you may consider adding or subtracting 100 calories from the 500 calories per day average.

Going back again to our example 34-year-old female from previous posts, we have determined her Resting Metabolic Rate to be 1,380 calories, her Thermal Effect of Food to be 230 calories, and her average daily Activity Expenditure to be 500 calories.

1,380-Resting Metabolic Rate + 230 Thermal Effect of Food + 500 Activity Expenditure = 2,110 total required caloric intake to maintain her current 142 pounds.

Note per this example, to maintain her current weight of 142 pounds she should be taking in 2,110 calories per day but we see she is actually consuming 2,300 calories per day or an excess of 190 calories per day. Knowing that one pound of fat “weighs” 3,500 calories we can determine with a great degree of certainty, our 34 year old female will gain one pound in just under three weeks! How do we know that? Well let’s do the math”

Current daily caloric intake (2,300) – current daily caloric expenditure (2,100)=daily caloric surplus (190)

3,500 calories per pound divided by her daily caloric surplus of 190 calories per day equals 18.42 days! In theory every 18.42 days our 34 year old female will gain one pound of unwanted weight!

What does she need to do to stop this weight gain? Diet….right? Well, not necessarily. Why give up something she may enjoy. The thought of dieting, or restricting caloric intake, carries a negative connotation. So, rather than restrict 500 calories per day let’s burn 500 calories per day! Go for a walk! Your kids and dog will love you! If our example 34-year-old female walked 1 hour each day at a brisk pace, she will burn approximately 450 calories she currently does not burn. So instead of having a surplus of 190 calories, she will now have a calorie deficit of approximately 260 calories per day! (450 calories burned walking less 190 daily caloric surplus equals 260). Knowing a pound of fat weighs 3,500 calories, she will lose one pound of fat every two weeks! (3,500/260=13.46).

You say you don’t have time to walk, how far do you walk to your local coffee barista? 1 mile each way and you are half way done. There is no better time to appreciate the benefits of light exercise as immediately following meal time. After every meal, our bodies either store or use the most recent calories consumed so no better time to put those calories to good use as just after taking them in! Remember to walk slightly faster than your comfortable pace to achieve good results. On those rainy days, pull out and dust off that old exercise equipment you bought a few years ago and rarely used.

Now that you understand your Caloric Expenditure you are finally armed with the basic knowledge to start becoming a healthier you!

And remember, “I you want it, you’ve gotta go get it!”