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Are you trying to seem educated or something if you're saying "Guy should cut down on his caffeine intake." which is heard in a film rather than just saying "you should drink less coffee"? Or it's not and educated guess?
I can imagine this sentence in an informal context. I don't think it would usually come across as pretentious. I can also imagine it shortened to: "Guy should cut down on his caffeine."
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Quote:
"you should drink less coffee"
Drinks such as Coke and Pepsi have plenty of caffeine, too.
Should cut down...vs. should drink less... 
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