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BMR and weight loss for dummies please help

Ok so I am trying to understand this... if my BMR is 1339 (based on an online calculator) and I want to lose 1 pound per week then I need to subtract 500 calories from that and then eat back the calories I burn, which is about 450.  That mean I should be neting about 1289 calories???

If it matters I am 5"6 and 125 and would like to get down to 120 and then maintain but 1289 calories seems really low.  I am currently neting between 1400-1500 and even with that, some days I am still hungry.

On another note I am on week 2 of p90x and I have noticed that over the past 2 weeks my weight has gone from 123 to 126, which I know isn't alot but it is bothering me and i don't want it to keep rising.

Any thought or insight would be appreciated

Re: BMR and weight loss for dummies please help

  • This is how I understand it:

    My BMR = ~1450 calories

    Workout = ~600 calories (or more or less)

    So, that means to stay my same weight, I would have to eat ~2050 calories.

    If I want to lose, I would have to either workout more or eat less to get a deficit (or both).

  • That BMR sounds too low to me.  Did you factor in your activity level?
    image
  • By definition, BMR doesn't have activity levels factored in, but many people seem to forget that part. If your BMR is 1339, I find it easier to then use the Harris Benedict equation to determine how many calories to eat to accommodate your activity level. That way, you don't have to worry about eating anything back, you just eat x every day. Then if you want to lose a pound a week, you subtract 500 from the number after factoring in your activity level.
    imageimageimage
  • imagekristinanddan:
    By definition, BMR doesn't have activity levels factored in, but many people seem to forget that part. If your BMR is 1339, I find it easier to then use the Harris Benedict equation to determine how many calories to eat to accommodate your activity level. That way, you don't have to worry about eating anything back, you just eat x every day. Then if you want to lose a pound a week, you subtract 500 from the number after factoring in your activity level.

    D'oh!  That's what I meant.  Sorry, brain fade.

    But still, that number seems low to me.  I'm 50, 1 inch taller, and my BMR is higher than that.

    image
  • I hear ya - it's Friday!

    My BMR is higher than that too, but the OP is already at a pretty healthy weight for her height, so if she's in her mid-30s, that is what the BMR works out to be.

    imageimageimage
  • All kinds of things can be at play over the course of two weeks.  I wouldn't worry too much about it, if you are hungry eat.  Not sure what you are eating, but try to add more protein to your diet. 

  • BMR is what you'd burn if you laid in bed all day.  It's the barely functioning amount your body needs.  Calculate your needs using the 1 or 2 level for activity and then subtract out the 500 from that.  If you can get an exact measure of how many calories you burn (via heart rate monitor or similar device) eat back those exact calories.  If you're just guessing on calories burned, up your activity level to a 3 or 4 (in the Harris Benedict) and subtract out the 500 from that.

    The BMR is what you shouldn't go below on an average daily basis.

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