Parkinson's disease (PD) is a type of movement disorder. It happens when nerve cells in the brain don't produce enough of a brain chemical called dopamine. Sometimes it is genetic, but most cases do not seem to run in families. Exposure to chemicals in the environment might play a role.
Why Vegans are Often Deficient in Vitamin B12. The few plant foods that are sources of B12 are actually B12 analogs. An analog is a substance that blocks the uptake of true B12, so your body's need for the nutrient actually increases.
The nutrient content of a vegan diet will vary from person to person--depending on the balance of foods in their diet, the nutritional profile of each food and how fresh or processed it is.In general, it is recommended that vegans supplement their diet with vitamins in order to ensure they receive enough nutrients. nutrient deficiency disease is when your body is not consuming the right amount of a certain nutrient, therefor it is deficient. It can also be when your body is unable to a â¦ bsorb nutrients due to an abnormality. + 3 others found this useful. Premkumar Lazar.