Is Soy Protein Powder better than whey?
Unfortunately soy protein powder does not provide the same capacity for muscle development as whey and other animal sourced proteins. While soy is unique in that it contains all nine of the essential amino acids, it is low in methionine which is an important amino acid for muscle development. While this is the case, there are some products which have added methionine to make up for this shortfall.
Soy protein powder also has a substantially lower bioavailability value when compared with whey. This makes the protein less capable of being synthesised when compared with whey. However while soy is generally considered a less efficient protein compared with whey, it does have a lot of benefits often overlooked. There is evidence that soy protein intake can help with muscle fatigue and inflammation due to its antioxidant effect. It’s also been shown that soy protein can improve thyroid function which can assist with weight loss. Increased thyroid hormone output can promote protein synthesis as well as assisting in fat reduction. It has also been shown to improve cholesterol and triglyceride levels.