The human body contains enough energy at any given time to power a 100-watt lightbulb. This is why it's thought that humans are always wasting their energy. The human body has three types of energy: electrical, mechanical, and thermal, each playing a pivotal role in our body's equilibrium.

Thanks to elements within our body such as calcium, magnesium, potassium, and sodium, which all carry an electrical charge. Nearly all the cells in our body can use these charged elements, known as ions, to generate electricity.

There are ways to harness the energy from our bodies; one such example is one that we should all be familiar with: static electricity.

Everything in our world is made up of atoms; atoms are made up of electrons, neutrons, and protons. As you might remember from science class, electrons have a negative charge, neutrons have a neutral charge, and protons have a positive charge.

Creating a static charge is quite simple; a classic example is rubbing a balloon against your shirt. In this example, the shirt becomes positively charged while the latex balloon is negatively charged, and the two stick.

There's a classic kids science experiment that illustrates this beautifully. Where you take a tiny 3/8-inch bulb, attach two metal pins, one on each side, and hold it in your hand as you generate a static charge by dragging your sock-covered feet across a carpet,.

Another way to generate electricity from one's body is by using thermoelectric generators that convert the internal temperature of one's body to electricity, providing power to wearable devices.

Thermoelectric generators are solid-state devices; similar to a modern computer's SSD hard drive, they have no internal moving parts. These devices convert heat flow into useful DC power that can be used to power other devices. Check out this reference to learn all about the technology.

https://thermoelectricsolutions.com/how-thermoelectric-generators-work/

Perhaps the most creative, albeit troublesome, idea I ever heard about was a concept a team of Swiss researchers came up with over a decade ago. A power-generating turbine in the human artery that uses blood flow to generate electricity. At the time, it seemed so cutting-edge, even futuristic.

However, from a common sense and logistical perspective, it would be inherently flawed. In my opinion, it's an ethical issue as well. Although the concept is brilliant for what it is, that's neither here nor there. 

The human body is capable of so many things, and yet the average human doesn't care; they literally throw it away like it doesn't matter. The price of life has become insignificant in our world while everyone clings to materialistic possessions. I'm not sure what became of the blood flow turbine idea, but you can read about it below.

https://phys.org/news/2011-05-tiny-turbine-human-artery-harvests.html