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.
Relevance. Rating Newest Oldest. Best Answer: Being a vegan means that you don't eat or use any products that come from an animal. That includes meats (including fish and seafood), eggs, dairy products (including casein and whey), honey, gelatin, and everything that has an animal derived product as an ingredient. vegan basically doesnt eat anything with a face ie dairy and meat. Anything with dairy in it, cheese, yogurt, etc. No eggs either. You get the idea. A strict vegan can go as far as to cut out some types of flour.