1. Nutrition. 1.5. Body weight.

Level of recommendation	Statement
A	Statement: 1) An increased body mass index (BMI) of the mother before or at the beginning of pregnancy is positively associated with wheezing or asthma in the child, and 2) overweight and obese children are more frequently affected by asthma than normal-weight children.
	Recommendation: Overweight/obesity in women before and during pregnancy as well as in children and adolescents should be avoided for asthma prevention. (A)
Level of evidence	Women before and at the beginning of pregnancy: Liu 2020 (1++); Ekstöm 2015 (2+); Eising 2013 (2+); Guerra 2013 (2+); Harpsøe 2013 (2+); Leermarkers 2013 (2+); Harskamp-van Ginkel 2015 (2+); Wright 2013 (2+); Ziyab 2014 (2+); Pike 2013 (Pike 2+); Zugna 2015 (1++)
	Children: Loid 2015 (2++); Ziyap 2014 (2+); Popovic 2016 (2+); Casas 2016 (2++); Tsai 2018 (2+); Ekström 2017 (2+); Nahhas 2014 (2+); Forno 2014 (2-); Lang 2018 (2-)
Level of consensus:	Consensus