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Parents' Lounge / General Pregnancy / “Sunshine vitamin” helps expectant mothers have stronger-boned babies
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on: February 04, 2009, 05:57:30 PM
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“Sunshine vitamin” helps expectant mothers have stronger-boned babies
Researchers at Bristol University have found that expectant mothers having sufficient dose of the so-called "sunshine vitamin" more often than not have stronger-boned babies, as compared to others.
A well-researched study, spreading over a span of 18 years, reveal summer pregnancy helps women take adequate benefit of the vitamin-boosting rays of the sun. Even a little sun, in the form of walking outside or sunbathing, boosts the vitamin D levels of expectant mothers, thereby building stronger bones of the babies in the womb.
Researchers, who considered the probable sun exposure of 7,000 pregnant women during the last three months of pregnancy, found that by the age of ten, children born in the late summer and early autumn are roughly half a centimeter taller and have stronger bones than those born in winter and spring. They also have nearly five inches of extra bone area because of increases in bone width.
As per the recommendation of the researchers, women pregnant during winter need to take vitamin supplements to compensate for the lack of the "sunshine vitamin." According to the Food Standards Agency, ten micrograms of vitamin D is the advised dose during the pregnancy months.
Researcher Professor Jon Tobias, highlighting the "sunshine vitamin" factor said: "Wider bones are thought to be stronger and less prone to breaking as a result of osteoporosis in later life, so anything that affects early bone development is significant."
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438
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Parents' Lounge / General Pregnancy / How moms pass on experience without even trying
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on: February 04, 2009, 03:11:34 PM
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How moms pass on experience without even trying
By Maggie Fox, Health and Science Editor Maggie Fox, Health And Science Editor Tue Feb 3, 11:07 pm ET
WASHINGTON (Reuters) – Mothers can pass along their experiences to their children without even trying, researchers reported in a surprising study on Tuesday that showed baby mice could inherit the benefits of "education" that their mothers received before they became pregnant.
The study shows that inheritance can go far beyond the classic genetic theories, researchers report in The Journal of Neuroscience.
They found that young mice raised in an enriched environment -- with toys and other stimulation -- passed along the learning benefits to pups they had after they grew up.
The stimulated mothers did not simply have better parenting skills, because the researchers showed pups swapped at birth still learned better if their biological mothers - but not their foster parents - had been raised with the extra toys.
"You inherit to some degree some aspects of your parent's experience," Larry Feig, a professor of biochemistry at Tufts University School of Medicine in Boston, said in a telephone interview.
"This is a protective mechanism a mother passes on to her offspring," Feig, who helped lead the study, added. "The mother is changed for months. Her brain is changed so that when she is old enough to get pregnant, the effect is still there."
Feig and colleagues raised mice, some in plain cases with wood chips and others in "enriched" cages with boxes, a running wheel, toys, and constant rearrangements of nesting material.
They tested learning with an unpleasant "shock chamber" to condition the mice to be afraid.
Mice born to mothers raised in the "enriched" cages learned much more quickly that the shock chamber was a scary place, Feig's team found. This was true even when the mothers did not become pregnant until weeks after they lived in the special cages.
BRAINS OF MICE
When the researchers looked at the brains of the mice, they found clear changes in what is called long-term potentiation -- a measure of how well nerve cells communicate with one another. These changes were inherited by the pups, even if the pups themselves never saw a toy or running wheel.
Feig said what is being changed is a mystery.
"It is probably some hormonal effect," he said.
Learning and stimulation may raise levels of hormones -- he does not know which ones -- and these levels may stay high for part of an animal's lifetime and affect the developing fetus.
"There is a lot of evidence that during embryonic development the offspring are greatly sensitive to things the mother is exposed to," Feig said -- including food, chemicals and perhaps hormones.
Dean Hartley, a neurosciences researcher at Rush University Medical Center in Chicago who worked on the study, said this could work in two ways. "Does that mean an unenriched environment could have a detrimental effect?" he asked.
"Because the environment can affect us in both ways -- good and bad -- we need to be cautious about the environmental exposures pre-pregnancy."
The changes only lasted one generation, indicating the DNA was not permanently changed. Researchers are learning that DNA function can be altered without changing the genetic code itself.
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