The body can produce enough heat in just half an hour to boil water.
Each hour, the human body creates 350,000 joules of energy, which creates the same amount of energy as a 100-watt light bulb. This ends up being enough heat to boil a half gallon of water in just 30 minutes.
The body tightly regulates the body temperature through a process called thermoregulation, in which the body can maintain its temperature within certain boundaries, even when the surrounding temperature is very different.
In the process of ATP production by cells throughout the body, approximately 60 percent of the energy produced is in the form of heat used to maintain body temperature. Thermoregulation is an example of negative feedback.
The hypothalamus in the brain is the master switch that works as a thermostat to regulate the body’s core temperature.
Excerpt from "Health, or How to Live"
"Those who wish to pay a due regard to their health, must attend to their clothing. It should be adapted to the climate, the season of the year, age, etc."
"The principal object of clothing is to preserve a right temperature of the body. Hence persons in very cold climates require much more clothing than those in warm."
"Youth, in consequence of the rapid circulation of the blood, requires less clothing than middle and old age."
"The dress should be adapted to the season of the year, as every one knows that winter requires much more clothing than summer. But the greatest caution is necessary to make the change very gradually. Woolen garments should be put on early in the fall, and worn late in the spring. This is the more necessary, by reason of the sudden and great changes of our climate: one day the thermometer rises to a hundred, the next it sinks to forty; which racks the constitution, and proves very destructive to health. These vicissitudes must be guarded against by proper clothing, which should never be very thin even in midsummer."
"More consequence is now attached to figure and form than to health and convenience. Persons must dress fashionably, no matter how ridiculous or dangerous it may prove. Hence fashion and shape are continually changing, without regard to health, climate, or comfort. In order to reduce the body to a fine shape, the stomach and bowels are squeezed into as narrow a compass as possible. By this reprehensible practice, indigestion, fainting, coughs, consumption and other complaints are produced."
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