Obesity Scapegoats It has been popular to blame the rise in obesity on the proliferation of cheap, calorically dense “junk” foods. Most analysts begin their story in 1980, since that is when the government began advising low-fat diets and instead everyone took up sugary carbohydrates instead. Economics journalist Matthew Yglesias notes that there has been weight gain since the 1880’s. The average BMI of 18-year-old men entering military academies has been rising since 1850 when the data first began collection.  And there needs to be a discount since the average age of the population has also been rising. Another variable to be considered is the increasing average age of the population.  Just as there are no sil...