Do grains and proteins in the same meal have bioavailability for the body

Many people, including myself when I first started, are under the impression that a protein is a protein, period. Some people think they are getting enough protein from foods such as nuts, oats, rice and potatoes.

However, even though there are protein's in these foods I mentioned above, they should not be considered a primary protein source. Let me explain.

For one, you would need to eat a massive intake of those food sources to obtain your daily protein requirements and even if you could, you would over-consume in total calories which will inevitably lead to fat gain.