All meals contain some protein, and the quantity of protein is generally higher in animal foods in comparison to plant foods. Animal foods also contain protein of much higher quality which allows more protein from the meal to be used for growth and maintenance.
The quality of the protein in each meal can be important for consistent weight loss because it limits the amount of protein used for fuel and helps maintain lean weight which helps keep the metabolism high, a reduction in the metabolism is inevitable when people lose weight quickly.
Lets look at the uses for protein in meals:
Protein in meals may be used for growth and maintenance of tissues.
Converted into carbohydrates and used for energy.
Detailed explanation for the three uses of protein content in meals:
The protein in each meal can be used for growth and maintenance only if all essential amino acids are present at the same time. This is influenced by the quality of protein in each meal, high quality protein results in effective maintenance of lean body weight to help keep the metabolism sufficiently high enough to burn fat calories, poor quality results in its use for energy.
Protein from each meal can be used to provide energy for cells, in fact the body always uses a small percentage of protein for energy its use however rises depending on the physiological and nutritional state of the body at that given time. Some examples are:
People on a low calorie diet tend to use more protein for energy.
People on a low carb diet will use much more protein as there is limited carbs to provide energy for muscular movement.
People involved in high intensity exercise for long durations.
The protein in meals can be converted to glucose (sugar) and stored if more calories are consumed than the body requires. A certain amount of protein will be used for growth and maintenance as there should be some essential amino acids present simply due to the volume of food eaten, however as there would likely be sufficient consumption of carbs the body has no choice but to convert the remaining protein into glucose and used for fuel. The problem here is that the more protein is used for fuel the less body fat will be burned!
How the protein in a meal is dealt with depends mainly on the present state of an individual's body. So if you are trying to gain muscle or lose body fat the quality of protein in meals will be an important factor to consider.
Bread protein the amount of protein in bread