Characters should have quirks. Either the writer, actor, or director added in quirks of themselves or people they know so that they could relate to the character they are creating.
Quirks also make people human. Who wants to see a perfect character who does everything right? No one can really relate to that.
Other times people try to use quirks to make characters distinguishable or unique, which is usually hit or miss.
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Like Mara said, actors often spit out food after takes.
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I recommend you not having characters eat during dialogue though. Trying to maintain continuity while editing will be horrible
Quirks also make people human. Who wants to see a perfect character who does everything right? No one can really relate to that.
Other times people try to use quirks to make characters distinguishable or unique, which is usually hit or miss.
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Like Mara said, actors often spit out food after takes.
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I recommend you not having characters eat during dialogue though. Trying to maintain continuity while editing will be horrible