Doctors and nutritionists warn that the products are unregulated. The FDA doesn’t approve protein supplements or test them like conventional medications. Because of that, you can’t always be sure what’s in them.
Wayne Campbell, PhD, a nutrition scientist and professor at Purdue University in Indiana who studies protein in the human diet, says there’s likely no reason to worry about the protein itself in the supplements on store shelves.
“I’d be more concerned about the non-protein components of a supplement,” he says. “There may be ingredients in some designer, proprietary supplements that we don’t know what the effects are or what we’re consuming.”
What Else Is In Protein Powder?
There are other concerns, too. In 2010, Consumer Reports tested 15 protein drinks for heavy metals such as cadmium, lead, arsenic, and mercury. Three of them had potentially harmful amounts of contaminants, based on federal safety guidelines.
That same year, ConsumerLab, which independently tests supplements, said nearly a third of 24 protein supplements they tested for quality assurance failed. Two of them had a potentially risky amount of lead. Others had more cholesterol or sodium than was listed on the label.
Other, Safer Ways To Get Protein
A better focus for concern may be the amount of protein you eat rather than where it comes from, says kidney specialist Anjay Rastogi, MD, PhD, clinical chief of nephrology at UCLA.
Ideally, you should get 10% to 35% of your calories from protein, and most people should eat between 50 to 60 grams of protein per day, Rastogi says. (You’ll get an entire day’s supply from 6 ounces of skinless chicken.) When you get more protein than you need, whether from food or supplements, your kidneys have to work much harder to process all of it. Rastogi says that could cause harm over the long term, though he says that conclusive research has not confirmed this.
“But,” Rastogi says, “there’s always the potential for damage.”
People with kidney disease or those at risk of developing kidney trouble, which includes people with diabetes, need to be extra careful.
“For many kidney patients, a high-protein diet will cause numerous problems, like harmful buildups of urea, phosphorus, and acids,” Rastogi says.
Supplements Can Add Value
Athletes often boost their protein — via diet, supplements, or a combination — to help with muscle recovery after a workout, and research backs up its effectiveness. In 2009, the International Society of Sports Nutrition said athletes benefit from eating more protein. Protein supplements, the society stated, provide a “practical way of ensuring adequate and quality protein intake for athletes.”
“If you get about 30 grams of protein per meal,” he says, “then you’ve given your body all the protein that it can absorb, digest, and handle to stimulate the maximum amount” of muscle growth.
Isabel Maples, a registered dietitian nutritionist in Washington, DC, recommends that everyone try to get their protein from food. But she recognizes the value of protein supplements for some people.
“I work with a lot of older adults, who may not get enough protein because they’re eating less food or have difficulty chewing or swallowing,” says Maples, a spokesperson for the Academy of Nutrition and Dietetics. “A protein powder or dry milk may be a good choice for them.”
Kids and Protein Supplements
Atlanta-based pediatrician and nutrition expert Jennifer Shu, MD, says some teens, boys in particular, use protein supplements to help them bulk up. She tries to steer them and their parents away from such products.
“I explain to them that they’re unregulated, that too much protein maybe dangerous to the kidneys, and they get it,” says Shu, who points out that too much protein also can lead to dehydration. “That said, it takes a lot of supplements to go overboard, and most kids are not that consistent with taking anything. In general, I don’t see it as a major problem, but it’s something to be aware about.”
If parents do want to consider a protein supplement for their child, Shu says, they should first get guidance from a pediatrician or a registered dietitian.
Maples agrees: “In general, they’re not for use in kids and teenagers. If there’s a time when a protein supplement would be appropriate, that decision should come from a doctor.”
Buying A Supplement: Best Practices
Protein comes from many sources, and so do protein supplements. One in particular stands out, Maples says.
“Whey, a byproduct of cheese making, is really popular and a great choice,” she says. “It’s easily digested and used by the body.”
Other types of animal-based protein supplements are egg and casein. Unlike animal proteins, most plant-based proteins, which include soy, rice, and pea, lack at least one of the nine essential amino acids, the building blocks of protein.
If you buy a plant-based protein supplement, Campbell recommends that you be sure the label says that it contains all essential amino acids, likely a blend of multiple sources of protein. In general, the type of protein does not make much difference.
“It’s the quantity of protein rather than the source of protein that will have major effects on your metabolism, whether it’s for weight loss, appetite control, or recovery from exercise,” Campbell says. read more…