I was having lunch the other day at Pickity Place (a very cute, grow-their-own-herbs kind of place in New Hampshire). They always do a little riff on the herb that's associated with the zodiac sign that month, and Cancer's herb is dill:
So, I'm guessing that might be seasonings to avoid at lunch if you want participants to participate shortly after. Though I haven't noticed any big calming effects after eating dill or fennel, but who knows. Might be worth keeping a dish of fennel instead of candies for staff meetings that tend to get overheated.