Following Warren Buffett’s investment advice may be smart but nutritionists say that eating too many of the “junk-food” products made by companies he has invested in isn’t quite as wise. His move on Wednesday to inject Velveeta cheese, Jell-O, Lunchables, Oscar Mayer wieners, and Kool-Aid into his portfolio, stuffs an already amply supplied larder. The additions came from the acquisition of Kraft Foods Group Inc (KRFT.O) by H.J. Heinz Co, which is controlled by 3G Capital and Buffett’s Berkshire Hathaway (BRKa.N).