Live within traveling distance of the research center. Access to a telephone in their residence. Between 35 and 75 years of age Not currently ingesting Nopalea Not pregnant, planning to become pregnant, or nursing a child Not currently taking anti-inflammatory medications Medically stable - i.e. no recent major change in the last 3 weeks of prescription or non- prescription medication Not diagnosed with Type 1 Diabetes Not diagnosed with depression Not diagnosed with an acquired or congenital immune system deficiency