Excerpt from Back To Eden, by Jethro Kloss, 

Causes: A wrong diet, constipation, overeating, eating a combination of food at the same meal that causes fermentation, or devitalized foods.  The very elements that would keep the blood pure are removed from many foods by the way they are prepared. For example, the heart and the outside of the wheat, the eyes and peelings of potatoes, the outside of rice, and the heart of corn, which is take out of the meal.  These are wonderful alkaline medicines and do a great deal toward keeping the blood pure.

Some other causes of impure blood are improper breathing, sleeping in rooms that are not properly ventilated, and lack of exercise.  Often the muscles are poisoned and feel tired because of the accumulated waste matter from insufficient exercise. Read the rest of this entry →