When pollution is caused by nutrients and fertilizers, this is called nutrient pollution, and it leads to an overproduction of algae and other aquatic plants. This overabundance of plants and algae causes problems, because they cover the water surface and prevent sunlight from reaching the plants underwater.
Reverse T3 is actually an antithyroid -- T3 is the active thyroid that goes to the cells and stimulates energy and metabolism. Reverse T3 is a mirror image -- it actually goes to the receptors, sticks there, and nothing happens. So it blocks the thyroid effect. Reverse T3 is kind of a hibernation hormone, in times of stress and chronic illness, it lowers your metabolism.
It is important to note that TSH, free T4, and free T3 tests are a snapshot of what is occurring within a dynamic system. An individual person's thyroid testing results may vary and may be affected by: 1  Increases, decreases, and changes (inherited or acquired) in the proteins that bind T4 and T3.  Pregnancy.