Brain activation in relation to specific dietary components: what does fMRI measure and how should one interpret cravings for certain foods?

The article discusses research being done on the relationship between food and brain activation. It references the study "Effects of Dietary Glycemic Index on Brain Regions Related to Reward and Craving in Men," by B. S. Lennerz et al published in the 2013 issue of the "American Journal of Clinical Nutrition." The researchers used functional magnetic resonance imaging (fMRI) in assessing brain activation which may be caused by glycemic index (GI) level from food intake.