The purchase by Unilever of Slim-Fast Foods Co., a food business known for its nutritionally balanced products, and the super-rich-ice-cream company Ben & Jerry’s caught my attention the other day. Although this purchase doesn’t necessarily mean that we will be seeing sinfully decadent ice cream made with Slim-Fast in the near future, it does seem to reflect a major trend that I think we will be seeing at this year’s IFT Annual Meeting and Food Expo: the development of food products (and foo…