Read the article that inspired Professor Maruthur: Knowler WC, Barrett-Connor E, Fowler SE, Hamman RF, Lachin JM, Walker EA, Nathan DM; Diabetes Prevention Program Research Group. Reduction in the Incidence of Type 2 Diabetes with Lifestyle Intervention or Metformin. N Engl J Med. 2002. 346(6); 393-403.
http://pubmed.ncbi.nlm.nih.gov/11832527/