Dr. Skye Weintraub is a naturopathic physician practicing in Eugene, Oregon. She specializes in digestive problems, food and environmental allergies, and parasites. She is the author of several books, including The Parasite Menace. A parasite is an organism that lives in or on another organism, the host. The host will be injured to some degree from this relationship, if only from competing for nutrition.
Parasites can occur anywhere in the body.
About a third of them live in your intestinal tract. Parasites don't all eat the same diet, but most of them just love sugar, or some other simply carbohydrate that breaks down to sugar quickly. If you're a person who loves sugary foods, then you're going to attract these parasites. Parasites often eat the nutrition in your body before you get a chance to use it, so you get the leftovers. Well, most parasites have a fecal oral lifecycle.