Eupedia Forums
Site NavigationEupedia Top > Eupedia Forum & Japan Forum
Results 1 to 2 of 2

Thread: Strong bones and teeth linked with high testosterone and male fertility

  1. #1
    Satyavrata Maciamo's Avatar
    Join Date

    Ethnic group
    Country: Belgium - Brussels

    Strong bones and teeth linked with high testosterone and male fertility

    Science Daily : Male Fertility Is in the Bones: First Evidence That Skeleton Plays a Role in Reproduction

    Quote Originally Posted by Science Daily
    Researchers at Columbia University Medical Center have discovered that the skeleton acts as a regulator of fertility in male mice through a hormone released by bone, known as osteocalcin.
    The investigators then did several experiments that show that osteocalcin enhances the production of testosterone, a sex steroid hormone controlling male fertility. As they added osteocalcin to cells that, when in our body produce testosterone, its synthesis increased. Similarly, when they injected osteocalcin into male mice, circulating levels of testosterone also went up.

    Conversely, when osteocalcin is not present, testosterone levels drop, which causes a decline in sperm count, the researchers found. When osteocalcin-deficient male mice were bred with normal female mice, the pairs only produced half the number of litters as did pairs with normal males, along with a decrease in the number of pups per litter.
    What the article fails to mention is that osteocalcin acts on bone mineralization and calcium ion homeostasis. In other words, they strengthen both bones and teeth. High levels of osteocalcin are therefore the recipe for a strong skeleton and (large ?) strong, healthy teeth. The link with testosterone makes perfect evolutionary sense, since our male ancestors, who were hunters and warriors, needed strong muscles (developed by testosterone) and bones (built by osteocalcin). Generally speaking, strong bones are required for strong muscles lest the bone break under the muscle pressure.

    The increased male fertility may be seen as a by-product of elevated testosterone. But it also explains why women favour virile men for reproduction - not just muscular ones, but those with heavy skeletons and strong jaws and teeth. It is a sure sign of higher male fertility, and we now know why.
    My book selection---Follow me on Facebook and Twitter --- My profile on and on ResearchGate ----Check Wa-pedia's Japan Guide
    "What is the use of living, if it be not to strive for noble causes and to make this muddled world a better place for those who will live in it after we are gone?", Winston Churchill.

  2. #2
    Regular Member
    Join Date

    Country: USA - Illinois

    Along the same lines of stronger bones and increased testosterone, recall this study on Dr. Cannell's sight. I suppose the larger skeletal man might be the one that hangs out in the sun frequently.

    I know of no studies measuring male libido and vitamin D but Dr. Wehr and colleagues, at the Medical University of Graz in Austria, just published a surprising study showing that testosterone levels are directly associated with vitamin D levels (measured with the DiaSorin technique) and testosterone levels vary with the seasons, in concert with vitamin D levels. Furthermore, the men with very low testosterone levels had very low vitamin D levels. This study does not prove, like any association study, that vitamin D increases testosterone levels. It may be that sun exposure in the summer is responsible for both higher vitamin D levels and higher testosterone levels. By the way, the New York Daily News got it wrong, nothing in the Wehr study talks about vitamin D increasing male libido.

Similar Threads

  1. Replies: 11
    Last Post: 31-01-19, 20:52
  2. High testosterone linked to stingy behaviour
    By Maciamo in forum Life Sciences
    Replies: 14
    Last Post: 10-11-11, 10:31
  3. Do you brush your teeth in the kitchen sink ?
    By Maciamo in forum Other Serious Discussion
    Replies: 91
    Last Post: 18-04-06, 14:58
  4. Replies: 11
    Last Post: 07-03-05, 07:02
  5. A strong man
    By Golgo_13 in forum World News
    Replies: 25
    Last Post: 26-03-04, 23:21

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts