Hookworms, roundworms and tapeworms are certainly disgusting to look at and in severe cases have been known to cause, deformities, blindness and even death. But did you know that in developed countries, inability to lose weight and other mysterious illness may be attributed to these parasite predators?

This is the story of Kathryn, who had tried everything to lose weight with little or no success. She was desperate when she turned to nutritionist Ann Louise Gittleman, who had a very different idea about what was behind her fatigue and weight gain.