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Soy vs Whey Protein

Arun Gray

There is so much research and opinion on this one that you will find endless articles for both sides of the argument, if you read enough of them you can form your own opinion, where you will probably get to is that there really isn’t much difference!

Continuing the Soy vs Whey Debate...

For many years, a score called Biological Value was used to measure the quality of protein. Whey generally scored much higher than soy because of its unique composition. However, more current research shows a more appropriate measure of the effectiveness of different types of protein in building and maintaining muscle is called the Protein Digestibility Corrected Amino Acid Score (PDCAAS).
Both soy and whey have a PDCAAS score of 1.0, which is the highest score available, the same as egg whites.

Both plant-based soy protein and whey protein from dairy milk have been shown to help build and maintain lean body mass. Although not as rapidly digested and absorbed by the body as whey protein, soy protein does help support lean muscle mass.

Your body needs protein for survival. Amino acids — the building blocks of protein — are necessary for everything from immune function, metabolism and weight management to muscle repair, growth, development and performance. There’s also research that shows protein helps you feel alert, as well as more satiated for a longer period of time.  The common types of protein powders fall into two categories: animal-based protein (casein, whey and egg) and plant-based protein (hemp, rice, pea, sacha inchi, potato, etc.).


Soy Protein vs Whey Protein


What are the differences between traditional whey protein and plant-based protein?  Whey protein is a by-product of the cheese manufacturing process and is the liquid that is left behind after milk is curdled and strained.   Since whey protein is derived from milk, lactose intolerance is one of the most common side effects from consuming whey protein.  Whey protein is a common allergen and can affect the immune system of individuals who may be allergic to it.  Whey proteins are also notorious for causing bloating which is a symptom of the body’s inability to digest it.  Symptoms related to digestive issues include abdominal pain, gas, bloating and diarrhea.  Whey protein is high in sulphur-based amino acids.  This means that whey protein is acid forming which can cause significant calcium loss and weakening of the bones known as osteoporosis.  Since over-consumption of whey protein leads to increased acidity and lowered pH of the blood, it is believed that this may give rise to various kidney disorders.


Protein Time Release Profile


Plant-based protein, on the other hand, is a much easier digestible source of protein for humans without the side effects associated with whey protein. Plant protein is perfectly packaged along with an abundance of phytonutrients, antioxidants, vitamins, minerals, and fibre —all critical components for optimal health and disease prevention.  Blended plant-based protein provides a full spectrum of amino acids through complementary sources and is alkaline forming in the body.


Whey Protein vs Plant Based Protein

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