Is 'prevent' correctly used in the sentence? Should I say 'can' or 'will'?
Maintaining a healthy lifestyle helps one prevent himself/herself from developing diseases that (can/will) shorten his/her lifespan.
No. Try: Maintaining a healthy lifestyle helps prevent diseases that can shorten a person's lifespan.
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No. Try:
Maintaining a healthy lifestyle helps prevent diseases that can shorten a person's lifespan.