Sometimes you may feel sluggish and need a quick boost of energy to get you through the rest of the day. Fortunately, several types of foods can be turned into energy quickly.

Generally, any green vegetable is healthy for you and is efficient at converting into energy quickly. If you already eat high amounts of green vegetables, try increasing your consumption of them. Foods such as romaine lettuce, spinach, cabbage, brussels sprouts, broccoli and green beans can improve your energy levels.

Some fruits are known as "super foods" because of their health benefits, according to Peertrainer.com. Blueberries, grapefruit, oranges, watermelon, pomegranates and cantaloupes are very efficient in giving your body extra energy. These foods have high amounts of fiber, potassium and other vitamins and minerals that your body needs daily.

Your body converts carbohydrates into glucose, which helps produce energy. There are two kinds of carbohydrates, complex and simple. Simple carbohydrates are often found in bread, snack foods, cereals, pasta and crackers. These are processed quickly, giving your body a fast energy boost, but often resulting in an energy crash later. Complex carbohydrates help keep your body active much longer. They can be found in rice, potatoes and whole grains.

Consuming vegetable juice or fruit juice is the easiest way to get quick energy into your body. Even a trip to Jamba Juice can be effective. According to Peertrainer.com, Americans get about 7 percent of their daily calories from fruits and vegetables. If you are able to increase this number every day, your energy will improve. Odwalla and Naked Juices are made with 100 percent natural ingredients and help give you energy.