I need help fighting the "I believe genetics play a significant role in weight gain" statement. My good friend who is an intelligent person but who is also slightly overweight asked me to present him with data that is peer reviewed and proves that genetics do not play a role in obesity. He firmly believes that it genetics are a significant factor.  I.E. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3137002/ Above is a government website that preaches fattie bullshit. Before you jump on him as stupid for being overweight, understand that he is very intelligent and reasonable when presented with evidence. He is a polyglot with a civil engineering degree who currently works in global corporate strategy and business development with me. He is much more intelligent than myself and I truly believe that solid evidence presented to him will change his life. Do we have some solid studies that show/prove there is not a strong or strong enough correlation between genetics and obesity?