A drastic change in the way people shop and eat is having a huge impact on Big Food, which is scrambling to catch up. Big Food is having a panic attack. Sales are plummeting steadily because shoppers are simply not interested in what big food companies have to offer. McDonalds’ sales per outlet have been dropping for the past three years. Frozen dinner sales are down 12 percent between 2007 and 2013. Per capita soda…