Eating plenty of carbs and sugar during pregnancy might put your child at greater risk of becoming obese in the future, according to a new observational study:
This study doesn’t prove cause and effect, since it is merely based on statistical correlations. But it’s still interesting. Note that the amounts of protein and fat that women ate during pregnancy were not associated with markers of future childhood obesity.
So if you want to err on the safe side, I’d recommend a diet based on real food, and low in sugar and refined carbohydrates.