# Calorie deficit going to my head: stupid BMI question

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

1. ### perseph0neFull Member

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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.

3. ### babycakePlease kick my butt!!

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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

4. ### perseph0neFull Member

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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....

5. ### tottyPersonal Trainer

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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)

:sigh:

6. ### MixxiFull Member

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

7. ### CarolanskiBack to it!

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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

8. ### perseph0neFull Member

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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.

9. ### little*redDon't worry, be happy :)

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Thanks for that explanation carolanski it all makes sense now .

10. ### tottyPersonal Trainer

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thats a better way of saying it lol x

11. ### MixxiFull Member

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Oh I get it now hehe thanks

12. ### Dom1979Gold Member

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Maths=pain

:giggle:

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