• Protein shakes can help build lean muscle mass.muscle fitness image by Leticia Wilson from Fotolia.com
  
  Several different types of protein shakes can be used for different purposes depending on personal health and fitness goals. Some choose to drink a protein shake in place of a meal in order to help manage weight, while others, namely athletes, drink a protein shake either before or after a workout to help refuel and build lean muscle mass.
  
  

Protein Sources

• Protein shakes can use a variety of different proteins from animal or vegetarian sources. The most common forms of protein included in protein shakes include: soy, egg, casein, milk and whey. Whey protein is the most popular protein source, according to Muscle and Strength, because it is rich in amino acids and is a fat-digesting protein source.
  
  Casein protein is popular for use in weight gaining protein products because of its thickness. Egg protein is popular among body builders because it is high in amino acids and lower in cholesterol than egg yolks. Soy protein digests quickly, but isn't commonly used in protein shakes because it is average in amino acids, according to Muscle and Strength. Goat milk protein is lactose free so it's beneficial for those with a lactose allergy.
  
  

Specific Shakes

• Protein shakes are available in ready-to-drink pre-packaged form, or in powder form that is mixed with milk. High performance athletes generally should choose a protein shake that contain high levels of protein and carbohydrates in order to refuel, boost energy and build lean muscle mass.
  
  Those using protein shakes to aid in weight loss should look for a shake or powder that is very high in protein, which will help you feel fuller longer, and low in fat and carbohydrates.
  
  It's also important to calculate how much protein you actually need. As a rule of thumb, the average user requires one to two grams of protein per pound of body weight.
  
  

Warnings

• It's important to make sure you are not allergic to any of the ingredients in your chosen protein shake. For example, some protein shakes contain lactose, a sugar usually found in milk that can cause digestive problems. Check the protein powder ingredient label for specific contents.
  
  

Misconceptions

• There is a misconception that protein shakes are only for body builders looking to gain weight and muscle mass. Protein shakes are also very beneficial for those looking to lose weight when combined with a proper exercise plan because protein helps curb food cravings and maintain stable blood sugar levels. Just be sure the formula is low in fat and carbohydrates if using a protein shake to lose weight.