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.
â September 26, 2013Posted in: Veganism, General, Health, Nutrition. The phrase, âa vegan diet,â is generally associated with a way of eating that is bland, restrictive, and tasteless. Vegans do not eat meat, cheese, dairy or eggs, but the selection is never-ending and chock-full of delicious choices.