Another factor could be two income households. Until I was in high school, my mom was a stay-at-home mom who could start preparing dinner before 4 pm and have it ready by the time Dad came home. Home-cooked meals tend to have more fresh veggies and less sugar and carb fillers. When both parents work, there's less time for cooking so there's more fast food and processed foods (with more carbs, HFCS and trans-fats) that needs little more than heating up before it is served.
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