I guess none of this should really come as much of a surprise, but for most Americans, their diet and exercize plans haven't changed a whole lot since the 80s, yet it's harder for people to lose weight now than it was in the 80s. Research has turned up a few causes they believe are linked to this:
1. Since the 80s, more and more meat products have been treated with antibiotics, hormones, and other additives that can contribute to weight gain.
2. Since the 80s, more and more food packaging has toxins and other impurities in them that the food in the package can absorb, and which can contribute to weight gain.
3. Since the 80s, more and more Americans are on medications like anti-depressants, and weight gain can be a side effectof those kinds of medications.
So, like I said - this really shouldn't be too surprising, but it's enlightening.