There's not a lot of great studies on this but if you look around at the nih.gov link there's plenty of related studies that would support the parent's claim.

There's not a lot of great studies on this but if you look around at the nih.gov link there's plenty of related studies that would support the parent's claim. https://bmcpublichealth.biomedcentral.com/articles/10.1186/1471-2458-11-526 https://bmcpublichealth.biomedcentral.com/articles/10.1186/1... https://www.ncbi.nlm.nih.gov/pubmed/29487531 https://www.ncbi.nlm.nih.gov/pubmed/29487531