Final answer:
Heat stroke can occur from a significant loss of body weight due to excessive sweating, which indicates severe dehydration. The condition is critical and can happen with the loss of around 1–2% of body weight. Proper fluid intake is necessary to replace the fluid lost from sweating.
Step-by-step explanation:
Heat stroke can occur when there is a significant loss of body weight due to excessive sweating, which often implies severe dehydration. Sweating is a natural body response that helps cool down the body by evaporating fluid from the skin and consequently carrying away thermal energy.
This process is efficient only when the body is properly hydrated, meaning that adequate fluid intake is essential to counter the loss during sweating. However, in highly humid environments, sweat does not evaporate effectively, making it more likely for internal body temperatures to reach dangerously high levels, as heat cannot be adequately dispelled. Heat stroke is a critical condition and can occur when a person loses around 1-2% of their body weight; however, this amount can vary depending on individual conditions and environmental factors.