The protein value of a food depends on two factors:
- Quantity - how much protein is in the food. This is expressed as a percentage of the total weight of the food.
- Quality - is the percentage of protein in a food that can be utilized by the body. This is expressed in a protein score called Net Protein Utilization. (NPU)
Quantity of Protein
The chart shows the top 20 protein food sources. It can be seen that the highest percentages of protein are found in plant rather than animal foods. In fact, soy foods hold 10 of the 20 slots, including the top five.

The NPU Chart
The NPU is a biological value or protein score given to foods that refers to the percent of protein that the human body can use.
It’s based largely on the food’s ability to digest and how it’s amino acids match the pattern required by the body.
On this chart you can see that chicken and tofu have the exact same protein value.
How to Use the Charts Together
By combining these two charts you can calculate the usable protein of various foods. Here’s an example. The daily protein requirement for an adult male is around 43 grams.
Regular Tofu contains 8% protein, 65% of that is considered usable by our bodies. Let’s do the math. One 8-ounce (227 gram) serving of tofu gives us 227 x .08 x .65 = 11.8 grams of usable protein. That’s more than 27% of the daily requirement.
If you do the math, you find that the same amount of usable protein can be supplied by 3 ounces of steak or 5.5 ounces of hamburger. The cost is much higher, of course.
Quality of Protein
The charts allow you to calculate the usable protein, but that in itself is an extremely small picture about the actually value of the these foods. It is a common misconception that the food value of meat is superior to plant. Protein is protein. But what we put our bodies through to get that protein is another whole story.
Americans presently obtain about 70% of all their protein from animal foods. Because of that, the standard American diet contains one of the world’s highest proportions of saturated fats and cholesterol. Cholesterol medication is a booming industry in our country.
Unique Quality of Tofu
Tofu is very unique among high protein foods. It is low in calories and saturated fats and completely free of cholesterol. It’s also an excellent source of calcium. Tofu is also a good source for other minerals such as iron, phosphororus, potassium, sodium, B vitamins, choline and fat-souble vitamin E.








When people think fiber, images of cavemen eating bark off a tree may enter their minds. 
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