So I've shared this swedish study a few times on this site... but not for awhile. This isn't going to be my best rendition of it, because I'm having an allergic reaction (grrr....latex) and am waiting for the meds to kick in.
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A HUGE study in Sweden (both longitudinal... spanning 3 generations, as well huge in number, hundreds of thousands of 'participants') was done looking at weights and menstrual cycles.
Cut to the chase / results:
- Nearly all prepubescent girls PACK on 20-30 pounds right before puberty
- Of those who diet / radically increase exercise/ etc.... they typically struggle with being 20-30 pounds overweight until menopause.
- Of those who CHANGE NOTHING, the weight stays on for 6mo-18mo and then just melts off with absolutely no change at all. This group typically has no to very few instances of being overweight during childbearing years.
Pretty jaw dropping, huh?
The theory behind this is that when the body is gearing up for reproduction, it's also setting certain 'norms'. If the body judges that it's in a famine or high stress environment, it sets a normal weight higher to make surviving pregnancy more likely.
Looked at historically... girls used to "come out" at 16. Prior to that, girls wore fairly shapeless dresses with empire waists almost universally (in the western world), until an age when nearly every girl has finished puberty. There are COUNTLESS references to 'baby fat', thinning out, growing curves, that show that pre 1900, this 'trend' for prepubescent girls to pack on weight was holding strong. Also highlights a bunch of other things, but we don't need to go into those (aka how girl's clothes have changed and the 'need' to be pretty/sexy/slim has crashed down into the childhood years could go on for pages).
Childhood obesity, obesity in general... isn't a 'single fix' problem. There are lots and lots of things that go into it (although, because of the startling results of the Swedish Study... the modern day trend of 'starving' infants by giving them tablefood at 6mo onward is also being looked into... the theory being that there are certain times in one's life that are key for setting 'normal' in one's weight).
This, however (the DO NOT DIET during pre-menses fat-stack) is a HUGE thing to be aware of. An extra 20-30 pound from pre-menses to menopause. That's a good 40 years of struggling to maintain a healthy weight, when 1 year of being chubby could eradicate it.