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.
A vegan follows a strict vegetarian diet and avoids eating animals foods and consuming dairy products. That can be a healthy alternative to a diet high in fatty animal products. To follow the vegan diet properly, you need to know exactly what foods to avoid. A vegan diet is not necessarily healthier than a regular diet, and a nutritionist can guide you in developing a nutritious vegan meal plan. Meat and Eggs Vegans cannot eat any type of meat, poultry or eggs.