What you eat could be the difference between a highly productive day at work and hours of hazy, confused thinking. Our brains run on glucose and need a constant, healthy dose to remain sharp and clear, one of the reasons skipping breakfast is a bad idea. The following smoothies are packed with foods that help boost blood flow, stabilize blood sugar, and neutralize free-radical damage—all important for optimal brain health and high mental performance at work. Smoothies are also a good alternative to a fast breakfast and can energize you throughout the entire day with a ready supply of nutrition. Here are some easily obtained fruits that make great smoothie combinations for your busy work days.