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Energy is stored as chemical energy in human body. It is consumed when required.
food
The human body produces electrochemical, kinetic, and potential energy.
The human body converts food/fuel to matter and motion, thus converting energy from mass to mass and motion.
Carbohydrates
The body converts the chemical energy of food to the chemical energy of ATP with about 50 percent efficiency, radiating the rest as heat.
Energy is stored as chemical energy in human body. It is consumed when required.
(# of ATP produced X Energy needed to produce ATP)---- Complete Oxidation of Glucose
With regard to work output vs. caloric input, the thermodynamic efficiency of a human being is about 25%. This comes from measuring the work output of cyclists compared to the oxygen they consume. However, some of the energy value of the food people eat exits the body unused, because it is not metabolized. The unused portion might be 1/3 to 1/2 of the total energy value ingested. When the unused food energy value is included, the thermodynamic efficiency thus drops to 13% to 17%.
food
sugars
The human body converts food energy into work, thermal energy or chemical energy that is stored in fatty tissue.
The human body produces electrochemical, kinetic, and potential energy.
no
Thyroid gland determines the rate at which human body utilizes energy.
To attain energy in the human body.
Do you mean more energy efficient for the human's digestive system or more energy efficient for business' and corporations to produce? For a human, eating meat will be more energy efficient. This is because Meat will contain more fats which means more energy. Grains and vegetables are full of crap which the human body cannot fully digest. This means we have to cook or process the hell out of to absorb more of the nutrients plus eat a whole lot more because its less energy dense than the meat. Corporations try to promote grains as much as possible because they are easy to produce on a mass scale for maximum profit. THAT IS ALL THEY WANT, MAXIMUM PROFIT. They can have fields and fields crammed with corn or wheat making it more space efficient (Try cram hundreds of cows together and you get disease and there is not enough grass on the ground for them to eat so they feed them with....corn - cows aren't designed for this!) In terms of energy efficiency meat production and processing requires more hands on work from people where grains can be all processed more buy machines alone.