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.
The above answers the question what does a vegan diet consist of. But vegans should be aware that a strict vegetarian diet eliminates sources of vitamin B-12 and the dairy products which are a rich source of much needed calcium for the body.hat Does a Vegan Diet Consist Of. Following a vegetarian or vegan diet is one good way of meeting all the nutritional needs of the body and staying healthy. A vegan diet may be chosen for a number of reasons.