1. Falconer, D. S. & Mackay, T. F. C. Introduction to Quantitative Genetics (Addison-Wesley, Harlow,1995 ).
2. Bouchard, C. et al. The response to long-term overfeeding in identical twins. N. Engl. J. Med. 322, 1477–1482 (1990).
3. Stunkard, A. J. et al. An adoption study of human obesity. N. Engl. J. Med. 314, 193–198 ( 1986).
4. Allison, D. B. et al. The heritability of body mass index among an international sample of monozygotic twins reared apart. Int. J. Obes. Relat. Metab. Disord. 20, 501–506 (1996).
5. Comuzzie, A. G. et al. Genetic and environmental correlations among hormone levels and measures of body fat accumulation and topography. J. Clin. Endocrinol. Metab. 81, 597–600 (1996).