In general, vegetables are excellent sources of nutrients, particularly potassium, vitamin c, folic acid, vitamin a, and fiber. Each of these has an important part to play in maintaining a healthy lifestyle, and have been linked to lower levels of obesity, diabetes, and heart disease, among other benefits. However, different vegetables are denser in certain nutrients than others. You can often group vegetables and their benefits by their color or similar characteristics. According to the USDA, there are five distinct groups of vegetables. These are dark green veggies, red and orange, beans and peas, starchy vegetables, and the other group. Each of these groups is stronger in certain nutrients than others. For instance, red and orange vegetables are great for vitamins c and k, while beans and peas are better sources of iron, potassium, and folates.