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.
Vegetarian or vegan: This diet emphasizes meat and fish, and Cordain says it's impossible to follow a Paleo Diet without eating meat, seafood, or eggs. Excellent vegetarian sources of protein, such as beans and other legumes, are not allowed. Low-salt diet: The diet doesn't allow salt