Thou shalt not eat fried food for dinner more than once a week. (And when you do, it should be pan fried in olive oil)
Thou shalt eat fish at least once a week (preferably non-farmed, high in Omega 3s and low in mercury)
Thou shall eat beef only once a week (and should consider pork a red meat also, so eat that sparingly as well)
Thou shall limit pasta based meals to twice a week (because believe me, without this rule I'd eat it every day!)
Though shalt eat plenty of veggies! (Ok, the rule for ME is to use up my veggie bin every week before a new one arrives)
This is what I attempt to stick to, in order to keep us healthy and happy and all that good stuff!