This episode's headline: Food For Thought; Conversation; Foul Fish. The guests include DR. MICHAEL McGINNIS, Assistant Surgeon General; DR. MYRON WINICK, Columbia University; CHARLES CAREY, National Food Processors Association; MICHAEL JACOBSON, Center For Science In Public Interest; RICHARD WILBUR, Laureate; CORRESPONDENTS: PETER GRAUMANN; CHARLAYNE HUNTER-GAULT. Byline: In New York: ROBERT MacNeil; In Washington: JAMES LEHRER