Canexican:

...There is not a single event in the history of mankind that has had a more pronounced effect on the human lifespan than basic sanitation and personal hygeine....

Do you have any data showing that daily bathing has any effect on life expectancy?

Canexican:

...P.S. I probably could get away without bathing every day too.... if I didn't have a job.

You could get away without daily bathing if the expectation of the society was changed. In other words- if everyone was smelly then nobody would pay any attention to your smelliness.

Body odor is an issue of sensitisation anyways. You don't smell your own usual BO or that of the people around you who eat a similar diet. But when you travel to a different place with a very different diet- you will notice other people's body odor (and vice versa).