If you are wondering which is the superior protein source (soy or whey) you will find your answer right here. Both soy protein and whey protein, in all their respective forms have an abundance of amino acids which will dramatically enhance your muscle growth and repair, especially when ingested immediately after your workout. Through careful study and analysis, soy protein and whey protein have been broken down into their respected components; so you can make the correct decision to fit your training regimen and to achieve your fitness goals.
1. What are the advantages of soy protein?
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Soy protein and soy supplements, especially those found in protein powders in the form of soy concentrate (at least 65% protein,) and soy isolate (at least 90% protein,) are exceedingly good sources for branched-chain amino-acids (BCAA's) with which to enhance your muscle repair, growth and strength. The advantages of soy protein include: either very low fat or completely fat free proteins, bad-cholesterol reducing, good-cholesterol boosting, overly abundant in glutamine and arginine, and soy protein is also lactose free.
Soy, through one of it's main components, isoflavones, has been known to reduce the effects of menopause, lower the potential incident rate of breast-cancer and endometrial- cancer, boost protection of the heart and bones, and to benefit from the FDA's heart-healthy claim of reducing cholesterol and incident rate of heart disease. Further still, soy has also been linked to potentially increasing your metabolism. All of these advantages are abundant in soy protein, so you are clearly encouraged to incorporate it into your diet and training program!
2. What are the advantages of whey protein?
Whey protein is the most readily absorbable form of protein of all proteins. More specifically, whey protein isolate is more readily absorbable than concentrate, and, hydrolyzed whey protein is the absolute most readily absorbable source of protein known to man. Hydrolized whey (also known as whey hydrolysate,) is whey isolate which has had some of its amino acid peptide chains broken into smaller pieces which allows for greater absorption. This ultra-high absorbability means more of the amino acid spectrum (the essential building blocks to repair, grow and strengthen your muscles,) will be utilized. Whey protein concentrate is at least 30% to as much as 80% protein. Whey isolate is at least 90% to as much as 96% protein.
The advantages of whey are also greater net protein utilization (NPU) 92 vs. 61 for soy protein, and, greater protein efficiency ratio (PER) 3.2 vs. 2.2 for soy protein. All of these advantages are found in whey protein, so for the most explosive results in your athletic or body-building program, make certain to supplement with whey protein.
3. Which is the better protein - soy protein or whey protein?
Both soy and whey are excellent sources of protein. Upon close examination, as detailed above and below, the facts are in favor of whey protein, especially if you supplement your protein intake with arginine and glutamine. That does not mean that soy protein is not a good idea to use. In fact, it is highly recommended you do use soy protein. Soy protein is extremely effective, especially if you are vegetarian and or lactose intolerant. Soy protein is also thermogenic, meaning you will ultimately burn more calories supplementing with it than you will consume directly from the raw supplement. So clearly soy has many advantages that you should utilize. However, if for whatever reason you do not wish to use a blend of the two, soy and whey, and you must choose between one and only one, then the better protein is whey protein.
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