A generous and well-paid parental leave can reduce the risk of mental illness among new parents. However, according to a new doctoral thesis at Stockholm University and Karolinska Institutet, many people with prior health problems are excluded from the most advantageous benefits – often just when they need support the most. This is shown in a new thesis in public health science that Amy Heshmati at the CHESS research centre (a collaboration between Stockholm University and Karolinska Institutet) will defend on Friday, 22 August.