Food influences metabolism differently. For example, some take more effort to ingest, consume, or metabolize than others. The calculation used to calculate this work is called the Thermal Impact of Food (TEF). The higher the TEF, the more energy food is required to be metabolized. The protein has the largest TEF, while the fat is the lowest. It means that a high-protein diet needs more calories to metabolize than a low-protein diet. That’s why consuming protein is sometimes said to improve the metabolism to a more considerable degree than consuming carbohydrates or fat. When it comes to weight control, the TEF of food seems to have no impact on the calorie balance.