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I think it can because fat cells carry estrogen.

For me, no. I wasn't always overweight (I didn't gain until I went off bcp 7 years ago) and my periods have been irregular since day one.

@MrsBrewer: i don't think the ones on the scales are very accurate TBH. i used to have it done during my fitness evaluations and they check it on a bunch of points around your body because people carry fat differently, or you would do the kind where you're submerged in water- it's really cool & the most accurate way to do it. the lower my body fat, the more regular i got, but even then it would go MIA sometimes and i was right on the line where they could have argued that i didn't have enough body fat to have a regular cycle (typically woman lose their cycle somewhere between 14-18% body fat because the body wants a certain amount of fat to sustain a pregnancy). my dr's rule of thumb is that anything beyond 50% over your ideal bodyweight will impact fertility. i take issue with this only because i disagree with 'ideal bodyweight' since people carrying a lot of muscle mass are going to be heavier and aren't always 'overweight' in an unhealthy way. but i can tell you right now i weigh more than i have EVER weighed and am seriously overweight in an very unhealthy way, my cycle is a mess and my skin is a wreck because i have too much estrogen floatin around in me. the fertility med i've taken, femara, is an anti estrogen (which is why body builders use it to combat puffy chests and help to get rid of fat), and logically if i had less fat on me and therefore less excess estrogen, it could help me ovulate better on my own and might clear up with awful acne i've developed. but i don't think even losing body fat would be enough to get me KU since i've been too thin and too fat and everything between and never had a sticky baby.

My weight doesn't seem to affect my cycles. I have always had irregular cycles, from when I started my period at 13 (weighing in at 95 lbs.) to right before I got pregnant (27, 145 lbs.) My cycle length tends to reflect stressful periods in my life. I chart though, so I can see that I'm having a long cycle. Before I charted, I was a basket case when I wouldn't have a period for three months.

Personally, yes. I didn't have any thyroid issues, however, I was TTC for a few months before my OB mentioned I should try working out. I lost 10+ pounds, and my cycles went from 35-45 days to 28 days. It was amazing ... I got pregnant the next cycle after my first 'regular' period.