The American diet has changed dramatically since the 1970s.
The portion sizes of everything from a muffin to a slice of pizza have gotten as much as 138% bigger. Americans now eat far more chicken than they did in 1975, but less beef. And in 2014, people started spending more money eating out than they did on eating at home for the first time in US history, according to the Department of Agriculture.
Source : BusinessInsider.Com