aye need ya help 'very important'

can someone of u who is good at english, LOL
tell me the meaning of this phrase:

"Investigators at the Harvard School of Public Health estimated the toll of behavioral contributors to early mortality"

I don't understand what a toll has to do with obesity???

 

oll1
tōl/
noun

1. 1.
   a charge payable for permission to use a particular bridge or road.
   "turnpike tolls"
   synonyms: charge, fee, payment, levy, tariff, tax
   "a highway toll"
2. 2.
   the number of deaths, casualties, or injuries arising from particular circumstances, such as a natural disaster, conflict, or accident.

 

Listen up, you're about to be taught english by a wetback.

there, all you need to know