Recently, I read an article from Labrada's website that stated that too much fiber has a negative effect on testosterone levels. I assumed it would have to be a massive amount of fiber, but the article stated more than 20 grams a day was not good.
I've been aware of the effects a high fiber diet could have on you, and lowered testosterone wasn't one of them.
Is there any truth to this? I'm curious since I have roughly 35-40 grams of fiber per day.
I have read that as well, but fiber has other benefits that I believe would outweigh any decreases in testosterone.
could this be because high levels of fiber can keep some fat from being absorbed?
I have not found anything that relates the decreased testosterone levels with decreased dietary fat absorption. While I would not rule it out, I doubt fiber would be able to block the absorption of enough fat to cause a significant change in testosterone levels.
"In a study by Tariq and associates, healthy men were given diets high in soluble or insoluble fiber. Prostate-specific antigen (PSA), a serum prostate cancer marker, decreased 10% after four months in the men on the diet high in soluble fiber. The levels of plasma testosterone also declined in the men on the high insoluble-fiber diet. These lower levels of testosterone were due to increased excretion of testosterone in the feces. Researchers are confident that these decreased levels of testosterone may be an effective way to prevent the progression of primary prostate cancer."