B 4か月以前に固形食を始めた赤ちゃんは肥満になりやすい：Study Links Infant Obesity With Starting Solid Foods Early - WSJ.com
リンク: Study Links Infant Obesity With Starting Solid Foods Early - WSJ.com.
4か月以前に固形食を始めた赤ちゃんは，4か月以降から固形食を始めた赤ちゃんに比べて，3歳までの時点で肥満傾向が現れやすい。ただし，母乳栄養で育てた赤ちゃんでは，この傾向はみられない，とのことです。
WASHINGTON (Dow Jones)--Starting solid foods too early among certain infants may increase the risk of becoming obese by three years of age, according to a study by Harvard researchers.
The study, published online Monday in the journal Pediatrics, found formula-fed infants who were given solid foods before they were four months old were far more likely to be obese at age three, compared to babies introduced to solid foods after age of four months.
However, among breastfed infants there was no association with the timing of solid-food introduction and obesity.
Susanna Huh, one of the study's researchers and a gastroenterologist at Children's Hospital in Boston, said the study backs guidelines set by the American Academy of Pediatrics that recommend introducing solid foods when infants are between four and six months old.
Data from the Centers for Disease Control and Prevention show that while 75% of women report breastfeeding their newborn children, only about one-third of women are exclusively breastfeeding their children when they are three months old.
Huh said that holding off the introduction of solid food until babies are at least four months old is one way parents can reduce the risk of their infants becoming overweight.
The solid-food study involved 847 children who are part of a broader study known Project Viva which enrolled more than 2,000 Massachusetts women who became pregnant between 1999 and 2002 in order to study the health of children born to those women.
One facet of the study is to look at factors that contribute to childhood obesity. Previous findings from Project Viva, primarily funded by the federal government and the March of Dimes, showed that the more weight women gained during pregnancy the heavier their children were likely to be at three years of age.
For the current study, researchers used data collected from a questionnaire that asked mothers about the timing of the first introduction of 10 solid foods such as cereal, vegetables, fruit, peanut butter, eggs, meat and sweets. Women were also asked about breastfeeding and formula feeding.
Among the 847 babies, 67% were breastfed and 33% were formula fed at the age of four months. Researchers then looked the timing of solid-food introduction and they obtained information on height and weight through the age of three years, as well as a gauge of fat measured using skin folds, to see if solid-food timing had any impact on obesity risk.
They found that formula-fed babies given solid food before they were four months old had a six-fold increase in the risk of becoming obese compared to babies introduced to solid food after four months.
Reseachers found that 7% of breastfed babies were considered obese at age three--or having a body-mass index at or greater than the 95th percentile on children's growth charts--compared to 13% of formula-fed children. Being overweight as a child is a major risk factor for being overweight or obese as an adult.
About one-third of mothers who were giving formula to their babies started solid foods before their babies were four months old, compared to 8% of mothers in the breastfeeding group. About 17% of children in the breastfed-group were given solid foods after six months compared to 9% of the formula-only group, suggesting that formula-fed babies were started on solid foods earlier than breastfed babies.
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