As I talk to someone about some subjects, could I use "when it comes to" at the beginning of sentence?
When it comes to food, I like...
Also, is it normally used in casual conversation?
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Yes, you can use it. It's an sort of "build up" to talking about a subject. It has a similar meaning to "Regarding..." and it's probably most commonly seen written, at the beginning of an article for example:
"When it comes to computers, most of us know how to use them but don't know how they work..."
It's like a signal to the reader to say "This article is about computers.".
In conversation it's most commonly used as a way of responding to what someone else has said, as a way of saying "I also have something to say on that subject", eg
Person A:"I love that new stone-fired pizza place on Market Street."
Person B:"When it comes to pizza, you have to go stone-fired every time."