Drinking a whey protein shake may be a quick way to get in a high-protein meal, but these drinks are not for everyone. Also, supplementing with a shake every once in a while may not be a problem, but consistent use could wreak havoc on your intestines. All you need to do is read a few bodybuilding blogs to know that protein shakes can cause abdominal cramping or diarrhea. Overuse of protein drinks, chronic conditions or food allergies might be why protein drinks cause problems for you.
Protein Drinks
The protein in protein drinks typically comes from casein, whey or soy. Casein and whey are found in milk, whereas soy is a plant-based protein. Although most people get enough protein through a regular diet, protein drinks are used as supplements by weightlifters, endurance athletes, and those on special weight loss diets. They can provide essential amino acids that are necessary but are not produced by the body and must be taken in through food. Their appeal is that instead of eating a large meal like a steak dinner, a protein drink can offer the same amount of amino acids to build muscle and promote health.
Bowel Problems
Bowel problems can include constipation, diarrhea, nausea, upset stomach, cramping, bloating and rectal bleeding. Those with irritable bowel syndrome may not be able to easily digest milk products like whey protein drinks.
Constipation
According to the Colon Cleansing and Constipation Resource Center, high-protein diets can bring on constipation. This is likely due to a reduction in eating fiber-containing fruits and vegetables, which keep bowel movements softer. Drinking protein shakes or drinks on a regular basis could potentially cause a similar reaction.
Diarrhea
One out of every four Americans is lactose intolerant. Many protein drinks are made with either casein or whey which are both milk proteins. Both types can contain some lactose even though the manufacturing process attempts to separate the casein and whey from the lactose. If you are lactose intolerant or have a milk sensitivity, protein drinks might cause diarrhea, stomach cramping or vomiting. You could be sensitive to either casein or whey, while having no trouble with the other milk protein. Soy-based drinks may be an alternative.
Protein Drinks and Bowel Problems
Protein drinks can cause acute bowel problems, but these should clear up when you stop ingesting the drinks. This is exaggerated if you have irritable bowel syndrome, diverticulosis, or other gastrointestinal issues. In a study conducted in July of 2010 by "Consumer Reports Magazine," many protein shakes were found to contain toxic metals like arsenic that could cause liver and kidney problems. Always check with a doctor about whether protein drinks are right for you and your unique medical history.
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