Many conditions present with high low levels of a nutrient, since both - excessive and deficient states of the same nutrient can be implicated with certain disorders. For instance, low calcium may trigger an inflammatory type of arthritis, while high calcium may lead to a degenerative type of arthritis. Low copper, or low calcium, may result in weak or fragile blood vessels, which can lead to hemorrhagic types of vascular disease, while high copper, or high calcium levels can lead to arteriosclerosis... 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...