Is Gut Bacteria Designed to Kill Older Adults?

There are 10 times more bacterial cells in your body than human cells. Although smaller than human cells, and weigh only 1-3% of our body weight, the 500-1,000 species of bacteria seem to have evolved with humans. We have an ostensibly symbiotic relationship with bacteria. But is this relationship the same when we get older, or is bacteria trying to kill us?

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