By Jennifer Yousfi Managing Editor Although meat-and-dairy prices are expected to zoom even higher from their current record levels, this slice of the commodities boom won’t be a slam-dunk profit play for investors: Many food producers are watching the revenue gains they’re reaping from the rising market prices get wiped by even bigger spikes in commodity-related expenses. “We are in the early stages of what will become a big mess for producers” of food products, including meat-and-dairy offerings, Greg Wagner, a senior analyst at Ag Resource Co., told the Dow Jones News Service. Over the next few years, retail food prices “will rise like never before” This explosion in prices that’s hitting the U.S. consumer right in the pocketbook is due to spiraling global demand, a nose-diving greenback, soaring energy costs and a big surge in the price of grains that ...