If your eating meat the proper size is 4 oz or the size of the palm of your hand for easier measuring.
Too much protein is not good for health. It can cause kidney disorders.
meats, beans, and certain vegetables
90 grams of protein. Most people don't eat near the amount they should
Typically the rule of thumb (in the workout world) is one gram of protein per pound of weight. Thus, if you weigh 135# you should eat 135 gms of protein.
About 50 to 60 grams of protein.
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No more then 4-6 oz.
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Yes, too much of anything can be unhealthy. Animal protein and protein supplements are expensive, unnecessary, and even harmful for some people. There are no known health advantages to consuming a high-protein diet. In fact, diets that are high in protein, especially animal protein, may even increase the risk of osteoporosis and kidney disease.
All organisms contain proteins. You eat protein whenever you eat something that was once living :P However protein is much more common in meat (red meat in particular) and green vegetables (like spinach).
Eating a dog would provide about 25-30 grams of protein per 100 grams of meat.
Protein contains essential amino acids that the body can use as raw materials to make other proteins for metabolic function.