A study published in the journal Nature has found in a region in chromosome 16 the tendency to suffer from obesity or underweight. The study has the participation of researchers from the Psychiatry and Mental Health research group at IDIBELL and the Networking Biomedical Research Centre on the Physiopathology of Obesity and Nutrition (CIBERobn). Article reference

Jacquemont, S et al. “Mirror extreme BMI phenotypes associated with gene dosage at the chromosome 16p11.2 locus”. Nature, Sept 1, 2011, doi:10.1038/nature10406