5 min read
The Entire Truth About Soy Protein
Lena Bauer
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Diets Premium Expert • 19.03.2026
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Scientifically reviewed by a clinical dietitian:
This article has been peer-reviewed for adherence to IŻŻ, WHO, and PTGiP clinical nutritional standards.
| Diets Premium Expert Lena Bauer | min read 5 min | Scientifically reviewed by a clinical dietitian 19.03.2026 |
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Key Takeaways
Soy is becoming an increasingly common component of our meals. It is also becoming an integral part of many people's diets. When looking at the offerings of many supplement companies, one can often find products that contain soy protein. Are plant-based proteins as convenient as those we get from meat? Please read the article.
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Soy - Characteristics and Application Areas
Soy is one of the most commonly cultivated plants globally. Soybeans are abundant in nutrients, including B vitamins and minerals such as phosphorus, magnesium, potassium, calcium, and iron. Consuming soy products regularly can decrease bad cholesterol (LDL) levels by up to 20%. Soy also serves as a source of plant-based protein, making it frequently incorporated in the diets of sports-vegetarians. The plant also contains phytoestrogens, which can aid in managing menopause symptoms.
General facts about soy protein
The belief that soy protein is incomplete is erroneous. It is regarded as the best form of plant-based protein, as evidenced by its rich aminograms. The high content of arginine is worth noting – an exogenous amino acid responsible for such effects as muscle pumping or stimulating post-workout recovery. If you wish to delve deeper into the topic of arginine, I invite you to read my previous article. The nutritional value of the protein itself should also not be overlooked. Here is what you will find in 100 g of this preparation: - 81 g of protein, - 7 g of carbohydrates (including 6 g of fiber), - 3.4 g of fat (1.6 g of polyunsaturated fatty acids), - 178 mg of calcium, - 81 mg of potassium, - 39 mg of magnesium.
Opinion of the European Parliament and Council
There is a widespread belief that soy products are harmful to men, however, this opinion is not entirely correct. The main accusation is that this type of plant-based protein is an effective method of lowering cholesterol levels. It mainly contains unsaturated fatty acids such as omega-3 and omega-6, which are essential for health. Studies have shown that genistein, which is found in soy, can inhibit the growth of cancer cells in men with prostate cancer. Further studies in a group of ten men with an average age of 20 years confirmed these data. The participants were divided into three groups and received different supplements: whey protein isolate, soy protein isolate, or placebo in the form of maltodextrin. The experiment lasted two weeks and during this time the participants performed strength exercises. The results showed that the group that took soy protein experienced a significant decrease in testosterone levels in the blood. Other studies have shown that soy protein has lower biological value than casein and contributes to a decrease in testosterone levels in men. However, Dr. Jack E. Lewi emphasizes that soy products should be consumed in moderation and with caution.
Allocating Doses
The dosage of soy protein supplements, like most other supplements, should be tailored to the individual body's requirement for this supplement. It is assumed that the maximum daily dose of products containing soy protein is 50 g. The reason for this is the presence of thioglycosides, which can have a negative impact on thyroid function. Prolonged consumption may increase the risk of developing a goiter.
Weight reduction
Experts emphasize that the daily intake of 20-30 g of soy not only improves overall well-being but also decreases the likelihood of certain diseases. The conditions they mention include osteoporosis, atherosclerosis, and female genital cancers. Upon examining the composition of many weight reduction products, soy protein is often encountered. This may be due to the high fiber content, whose reductive properties are commonly known and frequently utilized. Another reason for using soy is the low glycemic index. A low IG level signifies that the pancreas is not excessively stimulated to produce insulin. A high level of this hormone primarily promotes obesity. Additionally, polyunsaturated fatty acids are significant, as they regulate the lipid metabolism of our body, a topic frequently mentioned in the context of reducing excess weight.
Soybean protein or Whey protein?
Soybean protein is one of the most popular plant-based proteins. Despite its higher content of arginine, which I have already mentioned, whey protein is the most commonly used animal protein supplement. So, what should one choose and who should use it? The answer to this question can be found through the analysis of parameters such as biological value, growth performance, and participation in the synthesis of structural proteins. Whey protein undoubtedly wins due to its high biological value and high efficiency in stimulating muscle growth. However, soybean protein contains more arginine, but it cannot compete with whey protein in terms of efficiency. When comparing prices, soybean protein is cheaper, which can be an attractive solution for individuals who are cautious about supplementation. Soybean protein is particularly recommended for women, due to its phytoestrogen content and lower calorie intake. Also, do not forget vegetarians and vegans, for whom soybean protein is the best way to compensate for protein deficiencies resulting from the exclusion of animal products.
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Lena Bauer
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Diets Premium team expert. Specializes in nutrition plans, strength sports, and training plans.
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