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rainbowlife

rainbowlife
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Girls who eat a low-fat, high-fibre diet during puberty produce dramatically lower levels of sex hormones, a finding that suggests that eating sensibly over the long term can dramatically reduce a woman's risk of developing breast cancer.



Researchers found that girls who limited their fat intake to 28 per cent of calories -- a diet that falls within standard nutritional guidelines -- had significantly lower levels of estrogen and progesterone than girls who ate a more commonplace, high-fat teen diet.



That was true for as long as nine years after the diet began.



Joanne Dorgan of the Fox Chase Cancer Center in Philadelphia was careful to stress that "whether these differences ultimately influence breast-cancer risk is unknown," but there is much evidence from other research that they would.



Excess production of sex hormones is an established risk factor for breast cancer.



The study, published in today's edition of the Journal of the National Cancer Institute, involved 286 girls who were recruited at ages 8 to 10, before menarche. Their sex-hormone levels were measured at the onset of menstruation and again after one, three, five and seven years.



The girls in the intervention group and their families were provided with dietary counselling; the control group received just their schools' standard nutritional advice, or lack thereof.



Although the girls on the low-fat diet had much lower levels of sex hormones throughout the years, their physical development was not affected by the diet.



The median height and weight of the girls in both groups was virtually identical.



The intervention group actually consumed more calories, but had a healthier diet because the girls ate less of fat types considered harmful and more fibre.



Jennifer Nelson, national health promotions manager at the Canadian Breast Cancer Foundation, said the relationship between dietary fat and breast cancer has been studied for decades, but the new research is important because it is the first actually to measure the impact of diet during puberty, rather than to have adults recall their food habits years later.



"The researchers were actually able to alter the hormone concentrations of these girls for the better, and they did it with a pretty simple, reasonable diet," she said. "This provides an important clue that young women and girls may be able to reduce their breast-cancer risk by reducing dietary fat, even at a young age."



Carol Seidman, chief executive officer of the foundation, said she thinks the research will resonate with teen and preteen girls. "Breast cancer is very much on the minds of girls in this 8-15 age group because they are touched by it every day; they have mothers, aunts and teachers with breast cancer, so they're very aware."



Ms. Seidman said she hopes girls and their parents will retain one key message from the study: "The emphasis here is on common sense. If you eat well, you're going to be healthier."



In 2002, breast cancer was diagnosed in an estimated 20,500 women in Canada and 5,400 died of the disease.







[此贴子已经被Edward于1/15/2003 10:23:40 PM编辑过]


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JoJo

JoJo
     2 楼
ooooooooo....sounds good...but hell!!dose institude or watever always have new findings!!!!!!!!!!!a lot of them are just contradictory!!!

lolapaluuza

lolapaluuza
     3 楼
Verkkoapteekit ovat erittäin hyödyllinen resurssi. Ne yksinkertaistavat huomattavasti lääkkeiden ostomenettelyä. Tämä pätee erityisesti pandemian aikana. Et aina halua lähteä talosta huonona olona. Siksi tilaan monia tuotteita verkossa miellyttävään hintaan. Voit esimerkiksi osta vibramycin.

AleksShamles

AleksShamles
     4 楼
Verkkoapteekit ovat erittäin hyödyllinen resurssi. Ne yksinkertaistavat huomattavasti lääkkeiden ostomenettelyä. Tämä pätee erityisesti pandemian aikana. Et aina halua lähteä talosta huonona olona. Siksi tilaan monia tuotteita verkossa miellyttävään hintaan. Voit esimerkiksi osta vibramycin.
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