Blood type O good and bad foods for your blood group. Good: red meat and poultry. Bad: pork and quail. Tip: Favor red meat from grass fed animals: their meat contains more Omega 3s. cold water fish like mackerel and herring. Bad: squid, pollock, octopus, abalone. Tip: Eat fish regularly, but don't use it as a meat substitute: your diet should contain both.