Approximately what portion of a 16-ounce sandwich is considered adequate for protein?

In the context of a 16-ounce sandwich, the adequate portion of protein is generally considered to fall within the range of 20-30%. This proportion reflects dietary guidelines that recommend protein to make up a significant, yet balanced, part of a meal. For a sandwich of this size, aiming for 20-30% means that you're looking for around 3.2 to 4.8 ounces of protein, which is a reasonable amount to support muscle maintenance and overall health.

This proportion ensures that the sandwich provides sufficient nutrients without overwhelming the consumer with excessive protein, which can lead to imbalances in the diet. This range aligns well with nutritional recommendations for a balanced meal, where protein, carbohydrates, and fats all play essential roles in providing energy and necessary nutrients to the body. Other ranges provided in the choices either significantly underrepresent the required protein intake or suggest excessive amounts that are not typically necessary for a single meal.