Dear Abby: How do I tell co-worker his fishy lunch habit is unbearable?

Dear Abby: I have a co-worker who eats canned sardines on top of his salad every day. I know they are high in protein and could be considered healthy, but they stink. He already covers his salad with red onion and balsamic vinegar, and the smell almost takes me out. If that’s not bad enough, he literally slurps the remaining oil after he has finished the salad.