Factors that determine your protein needs are of course whether you're tearing muscles down through heavy lifting, whether you're growing…your genetic makeup, etc.
So it would be stupid for anyone to try to give you an exact number of what your protein intake should be. The key is not to eat so much protein that your body begins to metabolize it as fuel source. If this happens then your body will quickly become acid, and overwhelmed by toxic ketons.
Your body must maintain homeostasis (balance). For instance your body must maintain a body temperature of 98.6 degrees. Well just as important as body temperature is body pH. Your body must maintain and overall pH slightly alkaline. Obviously certain areas of your body like your stomach will have an acid pH, but overall your body must maintain a slightly alkaline pH.
What tend to acidify the body are environmental toxins, stressful emotions such as worry anger or resentment (which increase cortisol (stress) hormone levels much the same way steroids and prohormones do), and acid forming foods. Certain foods will either produce an acid buildup in the body or an alkaline buildup. Any meat, dairy, or protein tends to buildup acid. The same goes for high sugar foods. Most cooked foods are acid forming. Most alkaline forming foods are raw veggies, sprouts, and some fruits. Again you don't need to eat exclusively alkaline foods, but overall you need an alkaline-based diet.
The diets I consider suicide are the ones that tell you to eat lots of protein and fat, but avoid all carbs including vegetables and fruits- which are not only an important for pH balance, the best source of nutrients and enzymes, but also the cleanest sources of protien and the best sources of fiber.
If your diet is low in fiber then bowel transit time slows way down. Also if mucoidal plaque has built up in your bowels then this will clog and slow bowel transit time as well. And protein slows down bowel transit time more then any other type of food. That is why it is so important you eat protein foods with high fiber foods (eat your vegies).
For instance, you see the dietary fad right now known as the Atkins diet…basically a meat and cheese diet. People are losing weight initially on that diet for many reasons it would take awhile to go into. But the results are short-lived, and the cost to long-term health is huge.
It works short-term, but if they know why it worked they still would not adopt it long-term.
So question everything, test everything, take what works, but know why it works…and never take any so-called "health" expert's word for it. Don't even take my word for it…test it…prove it to yourself.