Toronto study suggest that people who live in neighborhoods with a higher density of trees on their streets report significantly higher health perception and significantly less cardio-metabolic conditions (controlling for socio-economic and demographic factors).
Having 10 more trees in a city block, on average, improves health perception in ways comparable to an increase in annual personal income of $10,000 or being 7 years younger.
Minerals (nutrients) are inorganic substances (contain no carbon) that are necessary for normal body function and development.
Macro-minerals are needed in large doses (approximate recommended daily intake, milligrams (mg) per day ):
- potassium, K (3500 mg) - metal, ions are necessary for the function of all living cells;
- chloride, Cl− (3400 mg) - essential electrolyte in all body fluids;
- sodium, Na, natrium (2400 mg) - metal, essential for all animals and some plants;
- calcium, Ca (1000 mg) - metal, essential for living organisms, produced in supernova nucleosynthesis;
- phosphorus, P (1000 mg) - in the form of the phosphate is required for all known forms of life;
- choline (425 - 550 mg) - essential vitamin-like (vitamin B4) nutrient, synthesized in human body, but not sufficiently;
- magnesium, Mg (350 mg) - metal, essential for all known living organisms;
Trace minerals are needed in very small amounts (recommended daily intake, milligrams (mg) or micrograms (mcg) per day:
- iron, Fe (15 mg) - metal, found in nearly all living organisms;
- zinc, Zn (8 - 11 mg) - metal, essential for humans and other organisms;
- manganese, Mn (5 mg) - metal, toxic essential trace element;
- fluorine, F, fluoride ion, F− (3 - 4 mg) - a beneficial poisonous element, essential for bone solidity;
- copper, Cu (2 mg) - metal, essential to all living organisms;
- iodine, I (150 mcg) - a key component of thyroid hormones;
- selenium, Se (35 mcg) - toxic in large doses, essential micronutrient for animals;
- chromium, Cr (30 mcg) - chromium (III) is questionably essential for humans.