The obesity problem has more to do with mass amounts of specific drugs being pumped into every element of American daily life. Steroids, antibiotics, growth hormones...etc. than volume of food eaten.
Grabbed size portions are far and away to large but a quick look at history (documented objectionable and observable history) shows that just mass accounts of infested did acted quite differently on the body
Way simpler than that: it's because of adding sugar to every damn thing. Sugar makes you feel hungry even if you aren't.
I would like to make a connection to cheap vegetable oils, but I'm not sure if it is true or not. I think they go back pretty early in the 1900s. Sugar also goes back that far, but I think sugar consumption has gone up a lot. Sugar has also been replaced with high fructose corn syrup in many products, and it can have past 80% in fructose. Fructose is sweeter than glucose (the other component in HFCS and sugar) and is almost always sent to the liver for conversion into fat. Glucose can be converted into glycogen and can also be used by every cell in your body without conversion. Fructose overconsumption produces the same results as alcohol abuse, fatty liver and a fat belly.
I've noticed anecdotally that HFCS is WAY more addictive than regular sugar is, too. My wife once made a DIY Almond Joy and used HFCS instead of sugar and it was hard to stop eating them.
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