""There is little question," said Campbell, "that a plant-based diet has a broad-based effect that will prevent typical American diseases such as acne, depression, Alzheimer's, kidney stones, multiple sclerosis and heart disease.""
The idea is to try a plant based diet first, and see. Remember Dr Campbell's 8th Principle:
"Good nutrition creates health in all areas of our existence"
Don't forget sunshine also. Not a lot of that around right now though, if you are in the Northern Hemisphere.