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.
Veganism is a type of vegetarian diet that excludes meat, eggs, dairy products and all other animal-derived ingredients. Many vegans also do not eat foods that are processed using animal products, such as refined white sugar and some wines. Vegan refers to either a person who follows this way of eating or to the diet itself. That is, the word vegan can be an adjective used to describe a food item, as in, This curry is vegan, or, it can be used as a noun, as in, Vegans like cookies, too.. See also: Types of Vegetarians. Easy Vegan Recipes.