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did. It's reasonable to conclude that our food had something to do with our increased lifespan.
Sanitation/solid waste disposal probably has the biggest impact in human lifespan. Followed by antibiotics and other medical advances. Grains are certainly the most efficient way to feed a large population. Most of human history would have loved to have an endless supply of cheap calories. Although aside from being able to easily fulfill the caloric intake required for survival, most grains are relatively low in nutritional value.
Humans have ate lots and lots of grain for at least 10k years. The spikes in lifespan didn't happen until recently.
The three most important industries for modern civilization are the trash, sewer+water, and electricity.