There is a thought that soy protein is harmful for bodybuilding and if you are trying to build your muscles you shouldn’t take it in any case. Some researches show that soy protein and products containing soy can damage your health. However you should realize that the myths about the wonders of soy are not true but also you can’t assure yourself that soy is bad.
 A special concept called the Biological Value Scale was established for measuring the quality of some kinds of proteins. This scale shows how efficiently your body consumes certain protein. The higher the BV (biological value), the more amino acids and nitrogen will be preserved by your body from the foods you have taken. It means that this scale has the ability to measure the effectiveness of the growth of your muscles and the increase of strength.
Some time ago egg whites used to be on the top of the BV having the score of about 100. After that whey proteins have taken the leading position and had BV of around 106-159. Due to this whey protein is widely used for achieving muscle growth.
But it should be mentioned that you needn’t consume exceptionally whey protein in order to satisfy your body’s requirements. A lot of bodybuilders take various kinds of protein considering their BV during the day and right after the training.
The explanation is that the requirements of your body in protein are different in the morning, during the day, in the post workout period and even before the bedtime.
You should understand that no one protein can suit for any time of day. So let’s consider the biological value scale of some kinds of proteins in an easier way.
Types of protein and their biological value
Whey protein - 106-159;
Egg protein – 100;
Cow’s Milk protein – 91;
Fish protein – 83;
Casein – 80;
Beef – 80;
Chicken – 79;
Soy protein - 74;
Wheat Gluten – 54;
Kidney Beans - 49
From this scale you can see that the soy protein takes lower position. It means that it is not the most anabolic type of protein used for the better muscle growth.
However you shouldn’t take soy protein whenever you want to.
If you consume huge amounts of protein which belong to the less BV sources such as beans and soy than it is necessary you won’t be able to stimulate the optimal anabolic muscle growth.
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