Abstract
Women (n =16,395; 26% overweight or obese) from the ELFE French national birth cohort were categorised into 3 groups by self-reported weight change during the year before pregnancy: weight loss >5 kg; stable weight; and weight gain >5 kg.
Highlights
Reducing adverse pregnancy and fetal outcomes for women with overweight and obesity is a public health priority
Health professionals should be aware that gestational weight gain (GWG) may offset the expected effect of weight loss before conception on fetal growth in overweight and obese women
In our analysis restricted to non-smoking women with body mass index (BMI) < 25 kg/ m2 (N = 6,744), we found no association between weight loss before pregnancy and birth weight (β = 0.02 [95% CI −0.07; 0.11])
Summary
Reducing adverse pregnancy and fetal outcomes for women with overweight and obesity is a public health priority. Further studies have suggested that for women with overweight and obesity, diet and lifestyle interventions during pregnancy have very limited impact on other pregnancy outcomes, birth weight, and overweight risk in offspring [11,12,13]. These results are consistent with those from observational studies showing that high BMI before pregnancy was a stronger predictor of the risk of LGA than was excessive GWG [14]. We investigated the association between weight change over the year before pregnancy and birth weight
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