Protein drinks are dietary supplements or meal replacement beverages, used for a variety of reasons, including convenience, to deliver additional calories and high-quality protein. Protein drinks come in dozens of flavors and nutritional content, such as caloric value, varies widely. Typically, these supplemental drinks are vitamin and mineral fortified. There are pros and cons to adding these to your diet.
Types
Protein drinks come in powdered form, to be mixed with water or milk, or as a ready-to-drink beverage. These supplements are available in conventional flavors, such as chocolate; or exotic flavors, such as banana crème. Protein drinks are usually vitamin and mineral fortified and may contain other ingredients, such as sweeteners, caffeine and/or other stimulants and herbs.
Function
Protein drinks are designed to provide a maximal amount of nutrients in a form that is unlikely to promote body fat storage. These dietary supplements are usually targeted toward a specific population or objective, such as those who desire to lose or gain weight; athletes or body builders; or those unable to consume enough solid foods to meet their nutrient needs, due to illness.
Average Nutrient Values
Per serving, protein supplement drinks, on average, provide 250 to 300 calories, 35 to 45g of protein; 20 to 25g of carbohydrates and 2 to 4g of fat, according to WomenFitness.net. Each serving also usually meets 35 to 100 percent of the Recommended Dietary Allowance, or RDA, for most major vitamins and minerals. Many ready-to-drink protein drinks are lower in calories and protein, particularly those designed for weight loss, providing, on average, 180 to 220 calories per serving, 10 to 20g protein and a similar quantity of carbohydrates and fats.
The Protein
Protein drinks focus on protein--type, quality and quantity. Protein drinks are rich in complete protein sources such as whey, egg, casein or soy. The protein may be in the form of an isolate, concentrate or a blend. Ultra-filtration is a type of processing that increases the protein concentration. At a concentration of at least 88 percent, the protein is considered an isolate; at less than that, it is known as concentrate. When more than one type is used, labels will typically refer to the mixture as a "protein blend." Isolates, concentrates and blends are well absorbed by the body.
Pros and Cons
Protein drinks are convenient, usually nonperishable and portable. When whole foods are unavailable or time doesn't allow for a sit-down meal, they are a convenience. In addition to providing a rich source of high-quality protein, most drinks are also low in fat and high in carbohydrates. However, these drinks can be expensive, are not necessary for most individuals and, according to a report published by Consumer Reports in July 2010, often contain contaminants, such as the heavy metals, cadmium, mercury, lead and/or arsenic. If consumed in excess, heavy metals may cause organ damage.
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