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Prenatal diet affects onset of puberty 6-16-08
A new study suggests that a high-fat-loaded prenatal diet may predispose a
baby girl to have an early onset of puberty and subsequent adulthood obesity.
The study was conducted in rats and results were presented at Monday June 16 at
the Endocrine Society's 90th Annual Meeting in San Francisco.
Early puberty in girls is linked with a variety of health problem including
obesity, insulin resistance, teenage depression and breast cancer in adulthood,
said Deborah Sloboda, PHD, lead author the study from The Liggins Institute of
the University of Auckland in New Zealand.
"Other research suggests that a combination of prenatal and postnatal influences
in girls can affect the onset of menarche [menstruation]," Sloboda said.
In the study, Sloboda and colleagues fed pregnant rats a high fat diet or a
normal diet as control through pregnancy and lactation (breastfeeding).
The rats whose mothers ate a high fat diet had earlier onset puberty than those
whose mothers ate a normal diet, the study showed.
The rats that ate a high fat diet after weaving also entered puberty early. But
the combination of a high fat diet used both in pregnancy and during lactation
did not make the early onset puberty earlier, Sloboda said.
"This might suggest that the fetal environment in high fat fed mothers plays a
greater role in determining pubertal onset than childhood nutrition," she said.
Later in life, rats born to mothers who had a high fat prenatal diet had a
higher amount of body fat than controls did, even if they ate a regular diet
while young.
Increased levels of the ovarian hormone progesterone were also found in females
whose mothers used a high fat diet during pregnancy.
"Maternal high-fat nutrition may influence reproductive maturation and
reproductive capacity in adult offspring," Sloboda said.