Why eat? Fresh tomatoes are low in carbs. The carb content consists mainly of simple sugars and insoluble fibers. These fruits are mostly made up of water. Tomatoes are a good source of several vitamins and minerals, such as vitamin C, potassium, vitamin K, and folate. They are especially high in lycopene, a plant compound linked to improved heart health, cancer prevention, and protection against sunburns. Best ways to eat Eat as you go. This is a perfect companion for your snacking habit. Throw into in your salad and double-up both nutrition as well as taste of your salads.