Calorie deficit going to my head: stupid BMI question

Discussion in 'General Weight Loss Discussion' started by perseph0ne, 25 August 2008.

  1. perseph0ne

    perseph0ne Well-Known Member

    I have maths a-level, but my brain has turned to mush. Does your BMI fall more quickly at higher weights or at lower weights? I should be able to work this out but I can't.:eek:
  2. babycake

    babycake Please kick my butt!!

    the speed of it falling is dependent on how much you loose each time. ie the higher the total weight the higher the BMI. i think
  3. perseph0ne

    perseph0ne Well-Known Member

    That's not quite what I meant, I think. Because there's a square in the equation (m2) 6 lbs off would result in a different amount of BMI lost when you're at, say BMI 30, than if you're at BMI 20. I just can't work out whether it's more at a higher or lower weight, IYSWIM? I think your BMI falls faster if you're bigger and lose 6lbs but I'm not totally sure....
  4. totty

    totty Personal Trainer

    Unfortunately your BMI falls quicker the lighter you are...

    for example

    If you were 10st 7lb = BMI 23
    If you were 10st = BMI 21.5 (1.5 difference)

    If you were 20st 7lb = BMI 44.5
    If you were 20st = BMI 43.5 (1 difference)

  5. Mixxi

    Mixxi Well-Known Member

    I've wondered that myself before actually. How odd that the points go down quicker when your BMI is already healthy. :confused:
  6. Carolanski

    Carolanski Back to it!

    Its because when you weigh less - half a stone is a higher percentage of your body weight

    At 20.5 stone (287lbs) - 7lbs = 2.44% of your body weight
    at 10.5 stone (147lbs) - 7lbs = 4.76% of your body weight

    Carol x
  7. perseph0ne

    perseph0ne Well-Known Member

    Thank you!

    Actually I don't mind that. I know I have a long way to go to get to "healthy" and I think it will spur me on knowing my BMI is dropping faster as I get closer to my goal.
  8. little*red

    little*red Don't worry, be happy :)

    Thanks for that explanation carolanski it all makes sense now :).
  9. totty

    totty Personal Trainer

    thats a better way of saying it ;) lol x
  10. Mixxi

    Mixxi Well-Known Member

    Oh I get it now :eek: hehe thanks
  11. Dom1979

    Dom1979 Well-Known Member



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