Women's life expectancy in America. http://www.washingtonpost.com/wp-dyn/content/article/2008/04/21/AR2008042102406.html?nav=rss_nation This is really noticeable in my area. Everywhere you look, an overweight woman with a comparatively thin man. What the article doesn't take into account is the large number of women sitting in an office chair all week long. I'd say it's a given that mothering is more labor intensive than secretary work.