Vegetable is a broad term that refers to the edible parts of plants, which are usually their leaves, roots, fruits, or seeds. Vegetables are a staple food across the world and are a fundamental part of modern agriculture. Vegetables are a good source of dietary fiber, a type of carbohydrate that helps pass food through your digestive system. Studies show that fiber may also improve vitamin and mineral absorption in the body, which could potentially raise your daily energy levels. Many green leafy vegetables like kale, spinach, and chard contain potassium. Potassium helps your kidneys filter sodium out of your body more efficiently, which can reduce your blood pressure.