When you’re eager about whether or not you bake or broil your fish for dinner, it is also value eager about what sort of fish you will be consuming. Mark Hyman, M.D., is a fan of the SMASH methodology for choosing fish. “You wish to avoid the massive fish,” he says. SMASH is a handy machine for understanding which fish he’d choose: salmon, mackerel, anchovies, herring, and sardines.