Sources of protein include grains, legumes and nuts, as well as animal sources such as meats, dairy products, fish and eggs. Vegetarians and vegans can get enough essential amino acids by eating a variety of plant proteins.
https://en.wikipedia.org/wiki/Protein_%28nutrient%29
Protein is a nutrient needed by the human body for growth and maintenance. Aside from water, proteins are the most abundant kind of molecules in the body. Protein can be found in all cells of the body and is the major structural component of all cells in the body, especially muscle.
https://en.wikipedia.org/wiki/Protein_%28nutrient%29
RDAs provide the proper amount of vitamins and minerals. Recommended dietary allowances, or RDAs for short, are guidelines put together by the Food and Nutrition Board of the National Academy of Sciences' Institute of Medicine. RDAs apply to vitamins and minerals from food and daily supplements. The purpose of these guidelines is to inform you how much of a specific nutrient your body needs on a daily basis. It is important to meet your daily recommended dietary allowances so that your body gets everything it needs to function.
http://healthyeating.sfgate.com/purpose-rda-3190.html
The Recommended Dietary Allowance (RDA) for protein is a modest 0.8 grams of protein per kilogram of body weight. The RDA is the amount of a nutrient you need to meet your basic nutritional requirements. In a sense, it’s the minimum amount you need to keep from getting sick — not the specific amount you are supposed to eat every day.
http://www.health.harvard.edu/blog/how-much-protein-do-you-need-every-day-201506188096
How much protein do you need every day? Protein is essential to good health. The very origin of the word — from the Greek protos, meaning “first” — reflects protein’s top-shelf status in human nutrition. You need it to put meat on your bones and to make hair, blood, connective tissue, antibodies, enzymes, and more.
http://www.health.harvard.edu/blog/how-much-protein-do-you-need-every-day-201506188096
recommended dietary allowance (RDA) the amount of nutrient and calorie intake per day considered necessary for maintenance of good health, calculated for males and females of various ages and recommended by the Food and Nutrition Board of the National Research Council. See Appendices 4 and 5.
http://medical-dictionary.thefreedictionary.com/RDA
To determine your RDA for protein, you can multiply your weight in pounds by 0.36, or use this online protein calculator. For a 50-year-old woman who weighs 140 pounds woman and who is sedentary (doesn’t exercise), that translates into 53 grams of protein a day.
http://www.health.harvard.edu/blog/how-much-protein-do-you-need-every-day-201506188096
The Recommended Dietary Allowances (RDAs) are quantities of nutrients in the diet that are required to maintain good health in people. RDAs are established by the Food and Nutrition Board of the National Academy of Sciences, and may be revised every few years. A separate RDA value exists for each nutrient. The RDA values refer to the amount of nutrient expected to maintain good health in people. The actual amounts of each nutrient required to maintain good health in specific individuals differ from person to person.
http://medical-dictionary.thefreedictionary.com/RDA
Amino acids are the building blocks of protein. Amino acids are necessary nutrients. Present in every cell, they are also precursors to nucleic acids, co-enzymes, hormones, immune response, repair and other molecules essential for life.
https://en.wikipedia.org/wiki/Protein_%28nutrient%29
The recommended dietary allowances are a part of the dietary reference intakes, or DRIs. These guidelines include recommended intake for macronutrients, adequate intakes, tolerable upper intake levels and recommended dietary allowances.
http://healthyeating.sfgate.com/purpose-rda-3190.html
what is the rda of protein nutrient
The Recommended Dietary Allowance for protein is a modest 0.8 grams of protein per kilogram of body weight.