if you eat protein powders, this is a must read
When my daughter was 12 months old, we couldn’t keep weight on her. She fell below the 5th percentile and we needed to start packing calories into her foods. Rice protein powder was one of the foods I considered to amp up her protein intake in an easy, slurp it down kind of way. Now that I know what I know about rice protein powder, I’m not so sure I’d give it to an infant, even if it came from a quality company.
Because there’s no federal oversight on protein powders, you really need to know how to find the best one.
1. Make sure it’s digestible.
Almost all protein powders are easily digested, but when compared to each other, results vary. I wish there was one research article that compared the digestibility of soy, hemp, rice, whey, casein, and pea protein powders using the same testing methods. But no study exists. Digestibility is important because it affects our body’s ability to build muscle. Our bodies need protein to build muscle.
We do know some things though. One study found hemp protein to be about 87% digestible, but according to the Protein Digestibility-Corrected Amino Acid Scores (PDCAAS), it had about a 48% digestibility.1 The PDCAAS also rated soy protein isolate as 92% digestible and casein protein as 100% digestible.1 The digestibility studies I found on pea and rice protein lacked comparisons to other protein sources. However, the research clearly stated high digestibility on account of both proteins, but I think results are weakened when not compared to another protein.3,4
You can also look at digestibility in terms of how fast it’s digested. Whey protein has a rapid digestion rate, making it a digestibility winner. One research study found whey to be more digestible than soy, and soy was found to be more digestible than casein.2
2. Look for one with a complete amino acid profile.
A protein powder’s amino acid profile determines whether or not it’s a complete protein source (amino acids all globbed together are what make a protein). A complete protein has all the essential amino acids. Essential amino acids are the ones that your body can’t make, so you have to get them in your diet. Pea protein powder is the only protein powder to not contain all of the essential amino acids (unless the manufacturer adds them). Although many of the other protein powders are complete proteins, amino acid profiles still vary between sources. For example, hemp protein is higher in arginine than casein, pea, and soy proteins.5 Following consumption, whey protein showed the highest level of essential amino acids in the blood compared to soy or casein proteins.2
3. Investigate how it’s made.
Choose a protein powder that came from an organic protein source and inspect how the protein was grown (whether from a cow or a plant). You also need to know how the protein was isolated from its mother source. Some protein powders, especially non-organic ones, are made using solvents (very toxic chemicals) to separate out the protein. Solvent residues are always left in the product. I saw this concept in the organic chemistry lab when I used a chemical solvent to extract caffeine from black tea. Make sure the manufacturing process is solvent free.
4. Beware of heavy metal contamination.
Rice protein seems to have a predisposition to lead contamination, especially since a lot of rice protein powders come from China. A major source of the world’s lead and cadmium exposure comes from rice.6 In May 2010, Consumer Lab found NutriBiotic’s vanilla flavored rice protein to contain 6 mcg of lead per 15 gram scoop. They also found Metagenics UltraMeal chocolate flavored rice protein to contain 5.9 mcg of lead for a daily serving of 104 grams. In July 2010, Consumer Reports found two Muscle Milk products each contaminated with about 12-13 mcg of lead for 3 servings.
5. Eat as local as possible.
Different countries have different standards. Stick to protein sources that have come from the U.S. or Canada, or investigate a local source if you live overseas. Biotics found high levels of lead in rice protein powder imported from China.
6. Find a quality company.
Protein powders are not regulated by any governmental agency, including the FDA. Find a company that follows the proposed FDA current Good Manufacturing Practices (cGMP) for nutritional supplements. If you don’t know how to find this out, call them and ask. A quality company will also conduct third party testing of all their materials. By finding a good company, you eliminate HUNDREDS of protein powders. It costs money to have better manufacturing practices and third party testing, so the more expensive protein powders are usually the better ones. Metagenics is a quality company I trust, so I was surprised to see the lead contamination in their UltraMeal (but I think the problem is that it utilizes rice protein).
7. Watch out for fillers.
Everyone seems to flock to the hemp protein powder at Trader Joe’s because it’s so cheap, but the label shows that it’s cut with sugar. Other companies aren’t as honest. Due to lack of quality regulations, sneaky companies add fillers to their protein powders and never say so on the label.
If I could have dairy, I would eat whey protein powder from organic, grass-fed cows because it increases glutathione levels in the body (glutathione is a super hero antioxidant, and eating more kale supports this antioxidant system).
With all of these things in mind, my favorite allergy friendly protein powder is hemp protein. Because hemp protein powder is also high in fiber, it serves double duty in helping to balance blood sugar. Hemp has a heart healthy fat profile and its high amounts of arginine may assist immune function.1 I also like that my hemp protein powder was grown and processed in Canada.
This information is condensed in a free downloadable PDF. Feel free to educate your friends, family, and patients with this handout.
1. House JD, Neufeld J, Leson G: Evaluating the quality of protein from hemp seed (Cannabis sativa L.) products through the use of the protein digestibility-corrected amino acid score method. Journal of Agricultural and Food Chemistry. 2010. Volume 58, 11801–11807.
2. Tang JE, Moore DR, Kujbida GW, et al: Ingestion of whey hydrolysate, casein, or soy protein isolate: effects on mixed muscle protein synthesis at rest and following resistance exercise in young men. Journal of Applied Physiology. 9 July 2009. 107:987-992.
3. Wang M, Hettiarachchy NS, Qi M, et al: Preparation and Functional Properties of Rice Bran Protein Isolate. Journal of Agricultural and Food Chemistry. 1999. Volume 47, 411-416.
4. Gausserès N, Mahè S, Benamouzig R: [N]-Labeled pea flour protein nitrogen exhibits good ileal digestibility and postprandial retention in humans. The Journal of Nutrition. 1997. 127:1160-1155.
5. Aukema H, Gauthier J, Roy M, et al: Distinctive effects of plant protein sources on renal disease progression and associated cardiac hypertrophy in experimental kidney disease. Molecular Nutrition & Food Research. 2011. Volume 55, 1044-1051.
6. Shakerian A, Rahimi E, Ahmadi M: Cadmium and lead content in several brands of rice grains (Oryza sativa) in central Iran. Toxicology and Industrial Health. 18 January 2012.
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