Princeton's WordNet(4.60 / 5 votes)Rate this definition: 1  operation(noun) the state of being in effect or being operative. 2  operation(noun) a business especially one run on a large scale. 3  operation(noun) a planned activity involving many people performing various actions.
Tomatoes are a nutrient-dense food, meaning they are jam-packed with nutrients, but don't have a lot of calories. Lipids, carbs and protein are the three types of macronutrients your body breaks down for energy. The primary macronutrient in tomatoes is carbohydrates, although they do have trace amounts of fat and protein.
Tomato consumption in the U.S. has been rising and that's a good thing. Like potatoes, tomatoes are high in heart-healthy potassium. Plus, they're a good source of the antioxidant lycopene. Lycopene is a carotenoid that may help get rid of bad cholesterol, keep blood vessels open, and lower heart attack risk.