Mega Nipples Milk

Mega Nipples Milk

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Joseph Bennington-Castro is a Hawaii-based contributing writer for Live Science and Space.com. He holds a master's degree in science journalism from New York University, and a bachelor's degree in physics from the University of Hawaii. His work covers all areas of science, from the quirky mating behaviors of different animals, to the drug and alcohol habits of ancient cultures, to new advances in solar cell technology. On a more personal note, Joseph has had a near-obsession with video games for as long as he can remember, and is probably playing a game at this very moment.

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Unlike female nipples, male nipples appear to be purely decorative. But can they also be functional and secrete milk — that is, can men lactate?
Short answer: Yes, under certain circumstances.
To start, male lactation has been observed in a few domesticated animals, including cats, goats and guinea pigs, on rare occasions. However, male lactation seems to be common only in dayak fruit bats, though it's not yet clear why males of this species have the biology to spontaneously produce milk.
Importantly, human biology also makes male lactation a possibility.
For both women and men, breast tissue contains hollow cavities called alveoli, which are lined with milk-secreting cells. But the critical determinant of lactation is prolactin, a hormone that's produced by the pituitary gland and stimulates the mammary glands to produce milk. [ 11 Surprising Facts About the Endocrine System ]
Normally, non-pregnant women can have almost double the amount of prolactin circulating in their body than men, according to the National Institutes of Health. This concentration can spike by nearly tenfold during and after pregnancy.
Research has shown that male prolactin levels can also surge, according to a 2008 review on male lactation published in the journal Trends in Ecology and Evolution.
For instance, scientists documented lactation in male WWII prison camp survivors, who had suffered months of starvation. After receiving adequate nutrition, their hormone-producing glands rebounded far quicker than their livers (which normally metabolize hormones), resulting in hormonal spikes that caused lactation.
Similarly, a condition called liver cirrhosis can cause lactation by disrupting the organ's normal, hormone-metabolizing function.
Health issues that affect the pituitary gland or the hypothalamus, which normally inhibits the release of prolactin, can also cause male milk production.
For example, a 2010 study published in the Canadian Medical Association Journal documented lactation in a man with a pituitary tumor.
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Joseph Bennington-Castro is a Hawaii-based contributing writer for Live Science and Space.com. He holds a master's degree in science journalism from New York University, and a bachelor's degree in physics from the University of Hawaii. His work covers all areas of science, from the quirky mating behaviors of different animals, to the drug and alcohol habits of ancient cultures, to new advances in solar cell technology. On a more personal note, Joseph has had a near-obsession with video games for as long as he can remember, and is probably playing a game at this very moment.

Contact me with news and offers from other Future brands

Receive email from us on behalf of our trusted partners or sponsors

The ultimate action-packed science and technology magazine bursting with exciting information about the universe
More stories to check out before you go
Live Science is supported by its audience. When you purchase through links on our site, we may earn an affiliate commission. Here’s why you can trust us .
Unlike female nipples, male nipples appear to be purely decorative. But can they also be functional and secrete milk — that is, can men lactate?
Short answer: Yes, under certain circumstances.
To start, male lactation has been observed in a few domesticated animals, including cats, goats and guinea pigs, on rare occasions. However, male lactation seems to be common only in dayak fruit bats, though it's not yet clear why males of this species have the biology to spontaneously produce milk.
Importantly, human biology also makes male lactation a possibility.
For both women and men, breast tissue contains hollow cavities called alveoli, which are lined with milk-secreting cells. But the critical determinant of lactation is prolactin, a hormone that's produced by the pituitary gland and stimulates the mammary glands to produce milk. [ 11 Surprising Facts About the Endocrine System ]
Normally, non-pregnant women can have almost double the amount of prolactin circulating in their body than men, according to the National Institutes of Health. This concentration can spike by nearly tenfold during and after pregnancy.
Research has shown that male prolactin levels can also surge, according to a 2008 review on male lactation published in the journal Trends in Ecology and Evolution.
For instance, scientists documented lactation in male WWII prison camp survivors, who had suffered months of starvation. After receiving adequate nutrition, their hormone-producing glands rebounded far quicker than their livers (which normally metabolize hormones), resulting in hormonal spikes that caused lactation.
Similarly, a condition called liver cirrhosis can cause lactation by disrupting the organ's normal, hormone-metabolizing function.
Health issues that affect the pituitary gland or the hypothalamus, which normally inhibits the release of prolactin, can also cause male milk production.
For example, a 2010 study published in the Canadian Medical Association Journal documented lactation in a man with a pituitary tumor.
Stay up to date on the latest science news by signing up for our Essentials newsletter.
Thank you for signing up to Live Science. You will receive a verification email shortly.
There was a problem. Please refresh the page and try again.
Live Science is part of Future US Inc, an international media group and leading digital publisher. Visit our corporate site (opens in new tab) .
©
Future US, Inc. Full 7th Floor, 130 West 42nd Street,
New York,
NY 10036.

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