OK, for all you OCD folks out there...
The other day someone posted a link to SW that not only tracks your food
but uses it and your weight to track you metabolic rate on a daily basis.
So I thought, I'm already tracking my food in fitday and my weight in a
spreadsheet, I can do this myself. So I did.
It's not too hard--sum your food intake over the last week in calories,
subtract your weight loss or gain over the same period multipled by 3500,
divide by 7. Turns out that if you do that off the raw numbers it jumps
all over the place, but if you use a moving average of your weight (which
I was already calculating) you get a pretty consistent number.
But oh my socks and garters what a terrible number it is. I've been
tracking for the past 5 weeks or so; I've been cutting the whole time. In
that period my moving average BW has gone from 168.5 to 166.5, so .5
lb/week or so. But my BMR has gone from 2400 cal/day to **1850** c/day!
I'd like to tell myself this is some measurement artifact, but I don't
think so. I'm at 12-13% BF which is probably my setpoint, but even so it's
not that lean. I'm not attempting to correct for activity but I haven't
changed either my weights routine or my other activities much in that
time.
I'd heard, of course, that your BMR goes down when you eat less, but I
hadn't expected anything so drastic so quickly. What's going on? My
guesses:
* My genetics suck. Probably true, but not much I can do about it.
* My training or diet sucks. During the week I eat low carb (trying for
50g/day) and 1300-1400 cal/day--so about 500 under maintenance. On
weekends I eat between 2000-3000 depending on what parties are happening.
Maybe I'd do better with a more consistent diet, I dunno.
* I need to do something to keep the BMR up. Morning cardio, ECA,
something. I've been doing green tea, but only a cup or so a day.
'Course there's no reason I can't just ride it out, reducing cals to stay
ahead of the dropping BMR. Not a problem except I have visions of myself
as a quivering mass of jelly without the gumption to slide myself out of
bed.
Hugh
--
Experience keeps a dear school, but fools will attend no other.