Washington, Sep 12 (ANI): Body size and weight gain in younger and older adulthood may help weigh a man’s proneness to prostate cancer, according to a study by researchers at the University of Hawaii at Manoa’s Cancer Research Center of Hawaii.
Led by Dr. Brenda Hernandez, the researchers said that the risk varies among different ethnic groups
For the study, the researchers studied the relationship in a multiethnic population consisting of blacks, Japanese, Hispanics, Native Hawaiians and whites, and compared differences among age groups using the Multiethnic Cohort, a longitudinal study of men 45-75 years of age established in Hawaii and California from 1993-1996.
Of the 83,879 men who participated in the study, 5,554 developed prostate cancer.
Overall, men who were overweight or obese by age 21 had a decreased risk of localized and low-grade prostate cancer, according to Hernandez.
Their results suggested that being overweight in older adulthood was associated with increased prostate cancer risk among white and Native Hawaiian men, but a decreased risk among Japanese men.
While excessive weight gain between younger and older adulthood was observed to increase the risk of advanced and high-grade prostate cancers in white men and increase the risk of localized and low-grade disease in black men, it appeared to decrease the risk of localized prostate cancer in Japanese men.
“The relationship of certain characteristics, such as body size, with cancer risk may vary across ethnic groups due to the combined influence of both genes and lifestyle,” said Hernandez.
However, the relationship between body size and prostate cancer risk is not entirely understood.
Excess fat is associated with a number of conditions that contribute to cancer development including low-grade chronic inflammation, insulin resistance, metabolic abnormalities, and hormone imbalances.
These conditions may in turn contribute to more aggressive prostate malignancies.
Ethnic differences in cancer risk may be explained by differences in the distribution of stored body fat that could have a differential effect on the development of prostate cancer.
And the distribution of body fat may influence the specific way that excess fat influences cancer risk.
The study has been published in Cancer Epidemiology, Biomarkers and Prevention, a journal of the American Association for Cancer Research. (ANI)
Spanking found to have negative effects on low-income toddlers
Washington, September 16 (ANI): Spanking negatively affects the behaviour of toddlers in low-income families, according to a new study.
Published in the journal Child Development, the longitudinal study looked at how low-income parents discipline their young children.
It showed that spanking 1-year-olds leads to more aggressive behaviours and less sophisticated cognitive development in the next two years.
Verbal punishment, however, was not found to be associated with such effects, especially when it was accompanied by emotional support from mothers.
Besides, 1-year-olds’ fussiness predicted spanking and verbal punishment at ages 1, 2, and 3.
The study explored whether mothers’ behaviours lead to problematic behaviour in children, whether children’s challenging behaviours elicit harsher discipline, or both.
It looked at more than 2,500 exclusively low-income White, African American, and Mexican-American mothers and their young children, interviewing and observing them at home when the children were 1, 2, and 3 years old.
All participants’ family incomes were at or below the federal poverty level.
Using their own interpretations of spanking, mothers reported how often anyone in the home had spanked their children in the past week.
The study also looked at how often mothers verbally punished-scolded, yelled, or made negative comments-their children.
It showed that African American children were spanked and verbally punished significantly more than the other children in the study.
The authors speculated that that might be due to cultural factors, such as belief in the importance of children’s respect for elders and in the value of physical discipline to instil that respect.
Moreover, some African American mothers said that in preparing their children for a harsh, physically dangerous, and racially discriminating world, there was little room for error in their childrearing.
The study also shed light on information about the effects of such types of discipline.
“Our findings clearly indicate that spanking affects children’s development,” said Lisa J. Berlin, research scientist at the Center for Child and Family Policy at Duke University and the study’s lead author.
Specifically, children who were spanked more often at 1 behaved more aggressively when they were 2, and had lower scores on tests measuring thinking skills when they were 3.
Similar findings were made even after taking into consideration such family characteristics as mothers’ race and ethnicity, age, and education; family income and structure; and the children’s gender.
The study also found that children who were more aggressive at age 2, and had lower cognitive development scores at ages 1 and 2, were not spanked more at ages 2 and 3.
“So the mothers’ behaviours look more influential than the children’s,” said Berlin.
Unlike spanking, however, verbal punishment alone didn’t affect either children’s aggression or their cognitive development.
Interestingly, when verbal punishment was accompanied by emotional support from moms, the children did better on the tests of cognitive ability. (ANI)