This fascinating conversation with Emma Story Gordon explores the role that genetics have in the development of obesity in free living conditions. After all, we all live in the same environment and most people don't want to be obese - so why is it that some end up gaining a lot of weight and others don't, when neither are paying much attention to their food? 

References Cited:
https://www.ncbi.nlm.nih.gov/pubmed/2336074
https://onlinelibrary.wiley.com/doi/pdf/10.1111/obr.12089