Docent of medicine, Karolinska Institute, Stockholm, 1974.
He is Professor in Health Related Behavioral Science at Karolinska Institutet in Stockholm, working at the Department of Medicine at the Huddinge campus of the Karolinska University Hospital.
He has written several books on the issue and is the leading member of Viktklubben (the Weight Club) at the tabloid Aftonbladet.
Married Kerstin Jarvenius. Children: Charlotte, Carolina. Married Britta Hylander, August 16, 1974.
Children: Sophia, Gustaf.