Foster at the Dinner Table with Gatsby

I never realized how much symblism is behind a meal. For once Foster might be right. Looking at Gatsby, the atmosphere noticeably changes when Tom leaves the dinner table for a phone call and Daisy leaves soon after (obviously chasing Tom away from the phone - ie from talking with his mistriss). There is an obvious sense of unease at the dinner table because the hosts have left and Nick is seated with somone he still doesn't know very well.
Learning about Tom's affair seems to add to the unease. I'm also wondering if there is always has to be symbolism behind the dinner table?

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