Study suggests
that kids take after their same-sex parents when it comes to becoming
overweight by
Craig Weatherby
The
authors of a British study found that children are more likely to
become obese when their same-gender parent is obese.
When researchers from the Peninsula Medical School studied 226 families,
they found that the daughters of obese mothers were more likely
to struggle with weight problems.
Likewise, they found that the sons of obese fathers ran a higher
risk of becoming obese (Perez-Pastor EM et al. 2009).
The authors did not find the same link between mothers and sons
or between fathers and their daughters.
Their
research showed that the risks of obesity among eight year old girls
were 10 times greater if their mother was obese. With boys, the
risk of obesity was six times greater if their father was obese.
And compared to the apparent influence exerted by the weight of
their same-gender parent, the weight of the children measured at
the age of eight bore no significant relationship to their birth
weight.
These findings suggest that childhood obesity is not primarily caused
by genetic traits passed down by same-gender parents.
As the authors wrote, Childhood obesity today seems to be
largely confined to those whose same-sex parents are obese, and
the link does not seem to be genetic. Parental obesity, like smoking,
might be targeted in the interests of the child. (Perez-Pastor
EM et al. 2009).
This finding seems important because it may mean that parents can
reduce their same-gender childs risk of obesity by losing
weight themselves.
Same-gender
links were reversed in weight loss trial
Therapists from the University at Buffalo enrolled overweight parents
and children for a two-year program designed to help them lose weight
together.
When parents and children tried to lose weight together, overweight
children did better when the overweight parent was of the opposite
gender (Temple JL et al. 2006).
And overweight mother-daughter pairs fared the worst.
Compared with overweight mother-son or father-daughter pairs, the
participating mother-daughter pairs enrolled in the program consistently
lost less weight.
These clinical findings seem to contradict the results of the population
studies conducted in the UK and Australia, as summarized in this
article.
Australian study found similar links
The new UK study affirms the findings of prior Australian research,
which found that the body mass index of parents predicted the body
mass index of their children at the age of 18.
And over the course of the 9 year survey, the BMIs of both sons
and daughters were consistently higher in offspring with an overweight
or obese parent of the same gender.
After controlling for influences no weight gain, they Aussie team
found that the body mass indices (BMIs) of 18-year-old sons and
daughters resembled their mothers' and fathers' BMIs. (Burke V et
al. 2001).
The BMIs of parents accounted for 48 percent of the weight-variance
in daughters, and 33 percent of the weight-variance in sons.
Being physically fit at the ages of 12, 15 and 18 seemed to reduce
a childs risk of obesity.
As in the UK study, having a high birth weight did not predict that
a child would become overweight or obese by the age of 18.
Sources
*Burke
V, Beilin LJ, Dunbar D. Family lifestyle and parental body mass
index as predictors of body mass index in Australian children: a
longitudinal study. Int J Obes Relat Metab Disord. 2001 Feb;25(2):147-57.
*Perez-Pastor EM, Metcalf BS, Hosking J, Jeffery AN, Voss LD, Wilkin
TJ. Assortative weight gain in motherdaughter and fatherson
pairs: an emerging source of childhood obesity. International Journal
of Obesity, Nature Publishing Group. 33, 727-735 (12 May 2009) doi:10.1038/ijo.2009.76
*Temple JL, Wrotniak BH, Paluch RA, Roemmich JN, Epstein LH. Relationship
between sex of parent and child on weight loss and maintenance in
a family-based obesity treatment program. Int J Obes (Lond). 2006
Aug;30(8):1260-4. Epub 2006 Feb 21.
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