A calorie is different according to your genomics

Lhttps://www.washingtonpost.com/news/to-your-health/wp/2015/11/20/the-diet-study-that-upends-everything-we-thought-we-knew-about-healthy-food/

http://www.theatlantic.com/science/archive/2015/11/algorithm-creates-diets-that-work-for-you/416583/

http://dx.doi.org/10.1016/j.cell.2013.01.041