How much protein should you eat?

2 major viewpoints on this age-old question.

The DRI (Dietary Reference Intake) is 0.8 grams of protein per kilogram of body weight, or 0.36 grams per pound. This amounts to: 56 grams per day for the average sedentary man. 46 grams per day for the average sedentary woman.

Now, many interpret this to mean they should eat this in meat. Others believe that you should calculate the protein intake of ALL of your foods, as all foods have protein.