To try and determine how to prevent obesity in children researchers have been looking at the diet of pregnant women.
Norwegian researchers studied over 50,000 mother-child pairs. The mothers completed food-frequency questionnaires during pregnancy, from which caffeine intake was estimated, and the children's height and weight were measured several times until age 8 years.
BMJ Open. http://bmjopen.bmj.com/content/8/3/e018895
They found that drinking 2 cups of coffee a day caused a 17% increased risk for the child being overweight at age 3 years, and very high intake (3 cups a day or more) conferred a 44% increased risk. This persisted.
It seems to be a good idea to limit coffee during pregnancy to one cup a day.
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