I recently came across a strange idea that appears to be popular in the biohacking and alternative health community. The essence of it is that many of the ills of modern life are cased by a buildup to excess deuterium in our bodies. As this site explains:
Deuterium will enter the body and pass into the mitochondria and find itself at the top of the spinning head, ready to assist in energy production and create a magnetic field.
The spinning head is specifically designed by nature to accept hydrogen in its standard form. That is one proton and one electron. Deuterium contains a neutron and the spinning head is not equipped to deal with his neutron or wide enough for it to pass through the spinning head easily. When we have deuterium in the body it cannot pass through the spinning head well, gums up the system and ultimately slows down the rotation thus reducing energy production and magnetic field strength.
Less oxygen is drawn from the blood, energy levels reduce and your redox potential decreases. A lowering of your redox potential means a huge increase in your risks of chronic diseases.
Deuterium is not good if you want to live a long and disease free life. We need to remove it from our bodies.
There is even a centre dedicated to the science that goes into more detail (they believe, for example, that tissue deuterium should be <130ppm which is substantially below the natural abundance of the isotope).
Is there any science at all that says too much deuterium interferes with mitochondrial function and results in a large increase in chronic diseases?