Can boiling water with lychee shells prevent heatstroke?
Generally speaking, boiling litchi shells in water cannot prevent heatstroke. Detailed explanation is as follows:

Heatstroke usually occurs when the human body produces excessive heat and faces difficulty in heat dissipation under high-temperature conditions, leading to a disruption of temperature regulation functions and causing symptoms such as dizziness, thirst, excessive sweating, and elevated body temperature. The key to preventing heatstroke lies in cooling down, dissipating heat, and replenishing fluids and electrolytes. However, litchi shells are warm in nature, and the water boiled from them neither has a cooling effect nor helps the body regulate temperature or replace electrolytes lost through sweating. Consumption of such water cannot prevent heatstroke, and its warming properties might even intensify the sensation of internal heat under high-temperature conditions, which is detrimental to heat dissipation.
To prevent heatstroke, avoid prolonged outdoor activities during high-temperature periods, take sun protection measures when going out, and promptly replenish with light saltwater or electrolyte-containing beverages. If experiencing early signs of heatstroke, immediately move to a cool and well-ventilated place to rest and seek medical attention if necessary. Do not rely on unscientific methods like boiling litchi shells, as this may delay proper prevention and treatment.