Yes, bees and omega-3, though how many know that Drosophila flies get cancer, even brain cancer? The suggestion comes from deliberate self-medication in chimpanzees: Vernonia, which is an anti-malarial. Thus, two examples of what may be deliberate preventive medicine in butterflies and moths link to the same host plant, Podophyllum peltatum(May Apple) which indeed has anti-cancer properties:

1.) Euptoieta claudia (butterfly)

2.) Papaipema rutila (moth)

The foodplant is not favored by deer, otherwise, deer that browse host plants can be a threat to other lepidopterans.