Voice actor Mel Blanc (1908-1989) is well-known in the US for his carrot-chomping creation, Bugs Bunny. However, for years, there was a rumor that claimed that Blanc, the "man of a million voices", was allergic to carrots. This was said to be the reason that Blanc would chew carrots for those moments where Bugs was munching on one, then spit them out instead of swallowing.
Now Blanc did indeed spit out carrots while recording those scenes where Bugs punctuated his sentences with a healthy chomp. However, it wasn't because he was allergic. Blanc wrote in his 1988 book That's Not All, Folks! : "First of all, I don't especially like carrots, especially not raw. And second, I found it impossible to chew, swallow, and be ready to say my next line."
Even though he didn't like carrots, Blanc still appreciated what Bugs did for the popularity of the vegetable. "Bugs Bunny did for carrots what Popeye the Sailor did for spinach. "
Source: metv.com