If the granola bars were the type that "eat energy," which is nonsensical, they would be energy-eating bars, with the necessary hyphen. Not energy eating bars.
So it's obvious to essentially 100% of readers that he meant "get their energy FROM eating granola bars."
Consider the sentence "You get your energy grammar copping the Internet in an overbearing, pedantic manner."
It doesn't mean you get "energy grammar".
It means "You get your energy FROM grammar copping the Internet in an overbearing, pedantic manner."
Would it be better to include the preposition? Sure. But it's a really common, informal construction to omit it. No need to go off on a new member over it IMHO.
If the granola bars were the type that "eat energy," which is nonsensical, they would be energy-eating bars, with the necessary hyphen. Not energy eating bars.
So it's obvious to essentially 100% of readers that he meant "get their energy FROM eating granola bars."
Consider the sentence "You get your energy grammar copping the Internet in an overbearing, pedantic manner."
It doesn't mean you get "energy grammar".
It means "You get your energy FROM grammar copping the Internet in an overbearing, pedantic manner."
Would it be better to include the preposition? Sure. But it's a really common, informal construction to omit it. No need to go off on a new member over it IMHO.