America's poor response to Covid is partly to blame for lower life expectancy.
But the major reasons are shown here:
Americans have a lower life expectancy than people in other rich countries despite paying much more for healthcare. What factors may explain this?
ourworldindata.org
There's mention of poor dietary choices but the notion of food being poisoned doesn't seem t be applicable.
Nobody should go out shopping for reasons to answer the questions on what is happening in America. Rumours of poisoning of food is only helping to put off facing up to the facts.