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 In particular, women who ate a lot of saturated fats – the kind in
meat, dairy and eggs – had babies with more fat mass, regardless of
their pre-pregnancy weight, the study found.
The findings suggest that the total amount of calories consumed has
a larger effect on the baby’s weight than calorie source does, said
lead study author Tessa Crume of the University of Colorado Denver
Anschutz Medical Center.
At the same time, “we found that saturated fat intake was associated
with fat mass at birth,” Crume added by email.
To assess the connection between mothers’ diets and babies’ body
composition, Crume and colleagues studied 1,040 mother-infant pairs.
At times during each pregnancy, researchers asked the women to
recall everything they had eaten during the previous 24 hours.
The research team also had data on the babies’ length, weight and
head circumference at birth as well as body fat composition.
Half the women in the study were consuming up to 2,025 calories per
day, and half were consuming more than that.
Overall, up to half were getting roughly 32 percent of their
calories from fat, 15 percent from protein and 48 percent from
carbohydrates, researchers report in the American Journal of
Obstetrics and Gynecology.
Differences in the proportions of these nutrients in the women’s
diets were not associated with differences in the babies’ birth
weight, the study found.
But researchers did see differences in the babies’ fat mass based on
what their mothers ate.
Each 100-calorie-a-day increase in saturated fat in the mothers’
diets was associated with roughly an 11-gram increase in fat mass in
their babies.
Similarly, every 100-calorie increase in unsaturated fats – the kind
in olives, nuts and seeds – was associated with about a 6-gram
increase in infant fat mass.
One gram is about the weight of one raisin, or one paper clip.
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Every 100-calorie increase in carbohydrates was linked to
approximately 3 additional grams of infant fat mass, the study also
found.
The study can’t prove that mothers’ diets actually cause particular
body compositions in their babies, the authors note. And the
researchers had to rely on women to accurately recall and report
what they ate at several points during pregnancy.
Even so, the findings suggest that women should focus on the total
calories they consume during pregnancy as long as they eat a
reasonably balanced diet, said Dr. Emily Oken, a public health
researcher at Harvard University who wasn’t involved in the study.
Women should be especially aware that pregnancy is not a time to
literally eat for two, Oken added by email. Just a few hundred extra
calories a day might add up to too much food.
“We are learning that healthy gain in early pregnancy is especially
important – just a couple of pounds in the first trimester,” Oken
said. “Women should aim to gain within the recommended amounts by
continuing to exercise regularly and eating a nutrient-dense diet –
avoid ‘empty’ calories such as those in sugary beverages, candy, and
desserts.”
SOURCE: http://bit.ly/29GJEXS American Journal of Obstetrics and
Gynecology, published online June 28, 2016.
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