If you had any doubt that whole grains are hot, count up the number of products sporting the black-and-gold Whole Grain Stamp. That total recently passed the 5,000 milestone, a 25% increase in just nine months. Part of the accelerated growth is due to international interest in the stamp, launched in 2005: The stamp is now found on store shelves in 22 countries. A decade ago, whole grains were almost unknown in many countries, says Cynthia Harriman, PhD, director of food and nutrition strategies for the nonprofit Whole Grains Council