As we know all too well there has been an explosion in the incidence of obesity and type II diabetes over the past 30 to 40 years. Depending upon the bias involved, many people have opined on the cause of this sudden departure from previously fairly stable obesity rates.
People who believe the caloric theory of obesity – CICO (calories in vs calories out) – tend to believe the increase in obesity is simply from people eating more than they used to.
Those of a conspiratorial bent believe Big Food has made its spawn-of-the-devil products so tasty and addictive you can’t avoid them.
Those believing the carbohydrate-insulin theory of obesity posit that increased dietary carbs since the late 1970s is the driver.
All of these groups have data to back up their beliefs.