The Measure of a Man: Associations between Digit Ratio and Disordered Eating in Males

Objective: The current study sought to determine whether there is a relationship between prenatal testosterone exposure, as indicated by the digit ratios of the second to fourth fingers (2D:4D ratio), and disordered eating and drive for muscularity in men. Method: Digit ratios were calculated by measuring photocopies of participants' finger lengths. Self-reported body image and eating attitudes and behaviors were assessed. Results: There were significant correlations between 2D:4D ratio and disordered eating and drive for leanness, indicating that greater prenatal testosterone exposure was associated with less disordered eating and increased drive for muscularity. Discussion: This suggests that greater prenatal testosterone exposure may be protective factor against the development of eating disorders in men. Potential mechanisms are discussed. (C) 2009 by Wiley Periodicals, Inc.