Mixed-weight couples, where one partner is overweight and the other one isn't, have more relationship conflict, including arguments and feelings of anger and resentfulness, than same-weight couples, according to a study by researchers at the University of Puget Sound, in Tacoma, Wash., and the University of Arizona, in Tucson, published last month in the Journal of Social and Personal Relationships. Full text PDF available here.

Read Elizabeth Bernstein's Wall Street Journal article here.