Weight loss math

Wednesday, August 29, 2012

So todays featured sparkblog was about a test you can take to determine your resting metabolic rate (RMR) in oder to figure out how many calories a day your body needs and how many you need to cut back. I was thinking how handy would that be until I realized there are a ton of calculators out there that essentially do the same thing. (I used ) Based on weight and height my RMR is 1,682.

But that's just resting. Add in an activity level factor and you get:

Sedentary (1.2) = 2,018
Light (1.375) = 2,313
Moderate (1.55) = 2,607

So depending on the days activities, to lose 2 pounds a week, I would be able to consume 1018-1607 calories a day (SP has me set to 1200 -1500/day). That's an over 50% reduction in calories some days! No wonder I'm not losing weight, my body thinks I'm starving.

The website also had a calculator where you could determine how many calories you used during a normal days activities. For me on a workout day:

Eating - sitting
70 calories in 30 min
Reading - reclining
93 calories in 01 hr
TV - watching
93 calories in 01 hr
Showering (self care)
62 calories in 20 min
Dressing and Undressing
93 calories in 30 min
Cleaning - multiple household tasks, moderate
163 calories in 30 min
Driving - light vehicle (e.g., car, pick-up)
124 calories in 40 min
Treadmill - level @ 4 mph
186 calories in 30 min
Desk Work (office work)
1,506 calories in 9 hr
586 calories in 7 hr

Totals: 3,036 a day!

Now that's not a full 24 hours and this seems a bit high to me, but considering that I've noticed I do better when I eat higher in my SP range maybe I should make some adjustments to it. Taking out the treadmill for non workout days that gives me a range of about 1900 to 2100.

I'm not sure I'm ready to start eating that many calories a day but I will perhaps move my range up to 1500-1800 a day for a bit and see what happens.

Does this make sense??
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Member Comments About This Blog Post
    Ooo, that sounds fun to know how much you burn in a day and compare with what you eat :D
    2005 days ago
    It makes total sense to me! I loved today's SparkBlog because I have been busting my bootie for weeks now with only 5.5 pounds to show for it!!

    I will use the site you referenced and figure out what my new calorie range should be. THANKS

    emoticon emoticon
    2005 days ago
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    Disclaimer: Weight loss results will vary from person to person. No individual result should be seen as a typical result of following the SparkPeople program.