The amount of energy lost during talking can vary depending on several factors, including the loudness and intensity of speech, the duration of talking, and the individual's physiological characteristics. However, it is essential to clarify that the energy "lost" during talking is primarily in the form of heat and not a significant amount in terms of caloric expenditure.
When we talk, our vocal cords vibrate, and the air we exhale passes over them, creating sound waves that form speech. This process involves the conversion of energy from the respiratory and vocal systems into sound energy. The energy expenditure during talking is relatively small and is generally not a significant contributor to the body's overall energy balance.
Studies on the topic have shown that talking typically increases the metabolic rate by only a few percentage points above the resting metabolic rate. It is estimated that on average, speech-related energy expenditure ranges from about 5% to 10% above the resting metabolic rate, with some variation among individuals.
To put it into perspective, engaging in more vigorous activities such as walking, running, or even chewing food, would result in significantly higher energy expenditure compared to talking.
In summary, while there is some energy expenditure during talking, it is not a considerable factor in overall energy balance or caloric expenditure. The primary purpose of talking is communication, not energy expenditure.