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.
Pesciâvegetarian: Pesciâvegetarians eat fish, dairy, and eggs but donât eat meat or poultry. Lactoâovo vegetarian: Lactoâovo vegetarians donât eat meat, but do eat eggs and dairy products (ovo means eggs and lacto means dairy). This is the most common type of vegetarian diet.vo vegetarian: Ovo vegetarians donât eat meat or dairy, but do eat eggs. Vegan: Vegans avoid eating any animal products. They donât eat any meat products, milk, cheese, eggs, honey, or gelatin.