Why It Was Easier to Be Skinny in the 1980s

Some studies have shown that if similar people today and in the mid 1980s ate the same and exercised the same, the people from today would still be fatter than their predecessors. Theorized explanations include the changes in artificial sweeteners and other dietary chemicals, the increased use of antidepressants and the like, a higher percentage of meat in the diet, changes in gut biota.

Translation: I dunno.