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.
Veganism is a type of vegetarian diet that excludes meat, eggs, dairy products and all other animal-derived ingredients.Many vegans also do not eat foods that are processed using animal products, such as refined white sugar and some wines.Vegan refers to either a person who follows this way of eating, or to the diet itself.any vegans also do not eat foods that are processed using animal products, such as refined white sugar and some wines. Vegan refers to either a person who follows this way of eating, or to the diet itself.