What is the maximum percentage of protein that can be utilized for energy during exercise?

During exercise, the body primarily relies on carbohydrates and fats to meet energy demands. However, protein can also be used as an energy source, especially in prolonged exercise or under conditions where carbohydrate availability is low.

Research indicates that the maximum percentage of protein that can be utilized for energy during exercise is around 15-20% under normal circumstances. However, in certain conditions, particularly during endurance events or when glycogen stores are depleted, this can increase. It is notable that while protein can contribute to energy, it does so at a limited rate compared to carbohydrates and fats.

The percentage range you see, such as 30-35%, reflects a broader view of potential energy contribution, especially in scenarios of extreme exertion or dietary restrictions. The most accepted upper limit for protein utilization as an energy source is often noted to be around 10-15%, but can technically go up to about 25%, depending on the exercise's intensity and duration.

Thus, although protein can contribute to energy based on various factors, the correct understanding of its role during exercise is that it does not typically reach the higher percentages indicated in the choices available, and 30% is rather aspirational under extreme conditions rather than a consistent yield for energy production during various forms