Is there any known association between caffeine intake and late ovulation (long follicular phase)?
DH (29) Me (30). Charting since 7/10/12. My chart
1st BFP 11/19/12 --> loss @ 15 weeks (Feb 2013). Baby measured 9 weeks.
Most of the articles I found were pretty old (done in the early 90s) but one of them suggests the opposite--that a shorter menstrual cycle seemed slightly more common in women who consumed a lot of caffeine. A lot of caffeine is defined as 300 mg, and there is approximately 100mg of caffeine in 8 oz of brewed coffee. Here's a link to the most relevant study: http://aje.oxfordjournals.org/content/149/6/550.full.pdf. Their study concludes "caffeine intake was not strongly related to an increased risk for anovulation, short luteal phase (<10 days), long follicular phase (<24 days), long cycle (<36 days)..."
I skirt the limit of "a lot" of caffeine--right under 24 oz a day. I'm a coffee hound. I do tend to have slightly shorter than average cycles (usually around 25 days) although I've had some wacky ones lately.
Hope that helps!
I recently cut out caffein and haven't noticed any difference.