ANSWERS: 3
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Average calorie intake is about 2250 kcal per day(based on recommended figures. Humans manage to use around 90% of those (about 2020). There's 0.253 kcal in a BTU, so the average human body is radiating about 8000 BTU per day.
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It totally depends on your calorie intake. http://mb-soft.com/public2/humaneff.html
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not sure what you mean by a BTU
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