Many nutritional experts recommend not giving juices to infants under six months of age, and then only from a cup. They discourage drinking juice from a bottle, a practice which creates a high sugar breeding ground for cavity-causing bacteria. The upside Fruit and vegetable juices are often high in vitamin C , beta carotene , and potassium . Tomato juice is an excellent source of lycopene . Tomatoes also contain readily available antioxidants , such as beta carotene, vitamin C, and vitamin E .
Carrot juice is an excellent source of beta carotene, which converts in the body to vitamin A .
Mixed vegetables used in juices provide an array of phytochemicals that may be helpful in preventing many diseases. Sweetened cranberry juice may be useful to treat or prevent cystitis or urinary tract infection . The downside Juices typically contain very little of the fruit or vegetable's original fiber , making them less valuable in reducing the risk of diseases. Low-fiber fruit juice has a greater tendency to elevate blood sugar levels than does whole fruit, because fiber acts as an agent to slow down the absorption of simple sugar. Juicing is sometimes used during a detoxification fast.