What is the chief source of protein for human kind?
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Dietary sources of protein include grains, legumes, meats, and dairy products such as milk and cheese. Different protein sources have differing proportions of essential amino acids; therefore a variety of protein sources provides a full complement of the essential amino acids. Gaining all of one's protein from a single source reduces the opportunity to gain a full complement of amino acids, and also increases risks associated with some protein sources (for example, excess fats and insufficient fiber in meats, and increased levels of phytoestrogen in soy products).
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Protein is the greatest source for building muscle or prevention of muscle loss. Foods high in protein will be your meats and poultry, seafood and fish, tofu and dairy items like milk and cheese. Some of the high protein foods may come with high levels of saturated fats (mostly founds in meats), so you may want to consider protein shakes made from 100% whey protein which has low fat and low carb.
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foods high in protein/keratin.  Meat, fish, jello.
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MILK / VEG / PROTEINS
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There are proteins of animal provenience, that are called also nobble proteins. They asimilate better than the others(I mean of herbal provenience). I aggree that you have to check out the pyramid of nutrition. Go to www.usda.gov, for example and do your search. Another important point that you have to check out, is the DRD(daily recommended dose),\nthat is how much do you need to take every day and how much contains each portion.\n\nKaterina
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I think it's protein. Because most of the human organ need protein to be form. The human organ, including heart are consist of cells, and they need protein to regenerate, I think this also happens when they were formed in fetus period.
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Proteins:  Many and diverse.  Insulin regulates lipid and glucose stores.  Various hormones control a thousand and one functions.  Muscle protein provide locomotion and the ability to do physical work. Too many things to name here.\n\nCarbohydrates(CHO) :  Supply energy for cellular processes.  This is the gas for organisms.  Carbohydrates are broken down to make ATP from ADP and AMP.  \n\nNucleic acid:  DNA, deoxyribonucleic acid directs RNA to make proteins.  And, or course, proteins do a multitude of things.\n\nLipids:  Another energy source:  This is a storage compounds for energy.  Also, lipid compounds are useful for cushioning organs and insulation against the elements.
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Cow's milk really isn't good for human beings. Think of it this way, human breast milk is best for human babies, it contains antibodies, proteins, and essential fatty acids necessary for the baby to grow. It's the same for cows. Cows millk is best for calves, it contains all the proteins, antibodies etc. etc. needed to help a baby cow grow VERY fast. \n\nThe main protein in cow's milk is casein, which is too big for the human body to even assimilate (as are the majority of the things found in milk). Even though cow's milk has more calcium than human milk (4 times as much), it cannot be used by a human body b/c of the "big packaging." In fact, people who drink 2-3 glasses of milk a day have been shown to have a lower level of blood calcium. Multiple international studies have linked milk with increased risks of cancer. Crazy, ain't it? Vitamin A and D aren't naturally present in cow's milk; they are added by man, but there are an abundance of other foods that contain calcium and vitamins and are easier for the human body to use.\n\nCow's milk also has a TON of fat. 2% milk actually contains 35% fat, the "2%" fat is determined by weight only. Low fat milk is 24-33% fat, and whole milk is a whopping 49% fat. So what else is in cow's milk?\n\nSome dairy cows are given the hormone BGH to increase milk output. A normal cow produces 1.5 -2 gallons of milk per day. With BGH, they produce 8-9 gallons per day. That is some serious hormone action there, which is probably showing up in the milk. Now let's talk about government regulation for milk pasteurization. The standard state test (called a Standard Plate Count) is that milk containing 30,000 organisms or less per MILLILITER has been adequately pasteurized and is safe for people to drink.  And finally, 20-40% of caucasians and up to 90% of asians and africans are lactose intolerant due to the fact that humans gradually lose the the lactase activity in their small intestines between the ages of 1-4.\n\nI actually just found out about this information recently. I'm 21 and have been drinking milk occasionally all my life (I wasn't classified as lactose intolerant, but milk has never really tasted good or sat well in my stomach). Soy milk is ok, but I've also heard that it is highly processed. I've been turned on to Almond Milk. The sweetened kind tastes really great, and the unsweetened tastes a little bit like regular cow's milk with a hint of bitter almond.
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For vegans, tofu and other soy derivatives remain the best sources for protein as far as I know. Legumes and pulses are also high in protein. But make sure you're somehow supplementing your diet with essential amino acids not found in a plant-based diet. \n\nCheck out this site on nutrition analysis: http://www.nutritiondata.com/index.html
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High protien foods are Eggs, Tuna or other fish, Lean meats, milk, cottage cheese, along those lines
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You might find this helpful.\n\nCultural Propaganda on Protein Consumption\nhttp://dgwa1.fortunecity.com/body/protien.html
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Vegetables contain all of these organic compounds in differing amounts.  Carbohydrates as both sugars and copious amounts of cellulose.  Proteins in the cells, but not generally as large structual components (obviously no huge protein sinks like muscles.)  Lipids as cell membranes etc....  All living things have nucleic acids, even viruses.
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Anything with Wheat in it.  Gluten is a protien that comes from wheat.
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Like all amino acids, lysine functions as a building block for proteins. It's also a key player in the production of various enzymes, hormones, and disease-fighting antibodies.\n\nMany foods supply lysine, but the richest sources by far include red meats, fish, and dairy products (milk, eggs, cheese).
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I'm a vegetarian. Lentils are full of protein.  I've posted a link that is awesome and full of tons of great info.
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Low carb, high protein.
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Sweet Potatoes\n\nBrown Rice\n\nWhole Grain Pasta\n\n*Those are the most nutritious!*