Comments on: Coffee Estrogen Link – A Need to Worry?

By: Sean

Sean — Mon, 18 Nov 2019 03:34:56 +0000

What about men? Aromatase lowers testosterone because of the increase in estrogen. Its hard to find any information on this for men.

By: Lisa

Lisa — Fri, 06 May 2016 20:18:00 +0000

In reply to Joanna Palmer. Hi Joanna! Those are all great questions. Clearly there needs to be more research with more controls to see if other factors are affecting the conclusion. I don't understand how estrogen levels could differ based on race. There must be other factors involved. There are so many xenoestrogens in the environment, it's difficult to fully control other influences. I keep my coffee intake to no more than 1 cup per day mainly due to the cortisol affect.

By: Joanna Palmer

Joanna Palmer — Fri, 06 May 2016 15:02:24 +0000

Hi, I am really enjoying your blog, thanks for gathering all this info in one place.
There are a few things that strike me about the Caffeine & Estrogen study that have my little scientific brain sending off alarm bells:
1: The sample group is far too small for a study in which you are going to divide your group into racial cohorts. And then I’d like to know about Representitiveness- was the selection randomized? And that intensity of testing will of course cause a selection bias: people who are willing to attend for testing that frequently are almost always going to be women with a higher socio-economic status.
2: BPAs are known to be hormone disruptors and the study apparently had no data about how the caffeinated drinks were consumed.. eg if a woman drank soda from cans which still contain BPA as lining (as opposed to glass or plastic bottles which don’t) would the results have differed?
3: Then there is the issue of it being a self-reporting bias: relying on humans to self-report their eating or drinking habits always gives a bias because we self-report what we think the researchers want to hear (knowingly or unknowingly) skewing the results.
Just a few thoughts.
Thanks again.