switching to adult food early

hello! my puppy is turning 11 months old next week and I'm starting to run low on his purina proplan. I *could* buy another bag of it but the small bags are pretty pricey, so would there be any detriment to just moving onto adult food once he runs out of his puppy kibble? he's a medium breed (40lbs) and I know it's usually reccomended to wait until a year old, but surely switching a little under a month early won't cause too much harm?

submitted by /u/gayapollo
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