Fully 90% of Americans are deficient in one or more key nutrients.
Unfortunately, many Americans are not even meeting the government’s (flawed) recommended daily allowances of key nutrients:
(Chart from Precision Nutrition, based on USDA data)
One nutrient in particular to note is magnesium. Life Extension Foundation (LEF) points out in its most recent issue (December 2016) that magnesium could be the next vitamin D. It is a low-cost supplement that confers broad health benefits. Magnesium is associated with reduced risks of sudden cardiac death, stroke, type II diabetes, asthma, heart disease, hypertension, colon and pancreatic cancer, and more.
Depending on the type taken, it also helps the brain (magnesium-l-threonate is the most helpful) and bowel regularity. Ironically, magnesium oxide, the type most commonly sold, works best for regularity precisely because it is very poorly absorbed by the body and thus does not confer most of the other health benefits of this mineral! It is also important to have functioning stomach acid to absorb and utilize any mineral. Those on acid blockers are unlikely to be able to do so.