Of all the nutritional risk indicators documented above and elsewhere, low stomach acid production is a consistent and reliable risk marker in the development of major types of malignancies, which includes cancer of the stomach, esophagus, breasts, brain, lymph, lungs, ovaries, testis, pancreas, and others. An infection with the Helicobacter Pylori bacteria also lowers stomach acid, and it is a known risk factor in the development of stomach cancer and pancreatic cancer... Full Text

Manganese may help with some symptoms of Parkinson's disease such as muscle rigidity and twitching...
Research shows that phytosterols such as beta-sitosterol may help normalize the function of natural killer cells and T-helper lymphocytes...
Iron deficiency may be suspect with some forms of ADHD. 84% of children with ADHD were found to have abnormally low levels of ferritin...
A high intake of B Vitamins can trigger heart palpitations, HBP, major complications in patients with congestive heart disease...