Essential Minerals in Human Nutrition: Functions, Sources, and Interactions

Water and Minerals

Introduction to Minerals

Minerals are inorganic nutrients essential for various physiological processes in the human body. They are classified as major (macrominerals) or trace (microminerals) based on the required daily amounts. This section covers the major minerals and several important trace minerals, their functions, dietary sources, and interactions.

Major Minerals

• Definition: Major minerals are required in amounts greater than 100 mg per day and are present in the body in larger quantities compared to trace minerals.

• The Seven Major Minerals: Sodium, potassium, calcium, chloride, phosphorus, magnesium, and sulfur.

14 Total Minerals + Functions.

• Mineral functions include: helping chemical reactions take place in cells, working with immune system, muscle contraction, and keep heart beating.

• There are two types of minerals, major and trace

• Major minerals need to be consumed in over 100 mg per day, with at least 5 grams in the body.

• The major minerals are calcium, sodium, potassium, chloride, phosphorus, magnesium, and sulfur

• Trace minerals should be consumed in less than 20 mg per day

• The body contains less than 5 mg of trace minerals.

• The trace minerals are iron, zinc, copper, selenium, chromium, iodide, manganese, molybdenum, and fluoride

• Minerals remain intact during digestion and are not destroyed by UV, heat, acid, or oxygen

Binders can reduce bioavailability, while nutrients can improve it.

Calcium

• Most abundant mineral in the body.

• Functions:

  • Building and maintaining strong bones and teeth.

  • Critical for neuron and muscle function.

  • Regulation of blood pressure.

  • calcium toxicity is possible but highly uncommon

  • symptoms include bone pain, muscle weakness, mental confusion, iron zinc magnesium and phosphorus absorption impaired

  • Maintaining optimal levels of calcium in the blood is essential for muscle contractions

  • calcium is the primary mineral in hydroxyapetite that crystals that provide strength to teeth

• Dietary Sources: Brassica vegetables (e.g., broccoli, kale), fish, dairy products.

• Absorption Factors:

  • Decreased by spinach (contains oxalates).

  • Increased by vitamin D and lactose.

  • Calcium interferes with absorption of iron, magnesium, phosphorus, and zinc.

Sodium

• Most overconsumed mineral.

• Functions:

  • Regulation of mineral and fluid balance.

  • Enhances flavor in foods.

  • When a product has less than 5 mg of sodium, it is "sodium free"

  • excessive intake of sodium can also lead to osteoporosis

  • The recommended amount of sodium for adults up to 51 is 1,500 mg per day

  • Sodium balance is regulated by the kidneys

  • The AI for calcium is 1,000 grams daily

  • hyponatremia is when blood sodium levels are very low

• Health Implications: Excess sodium intake is associated with increased risk of heart disease and high blood pressure (hypertension).

Potassium

• Functions:

  • Regulation of water balance.

  • Acid-base balance.

  • Neuron and muscle function.

  • Foods highest in potassium include tomatoes and potatoes

• Dietary Considerations: Often underconsumed due to losses during food refinement; can be used as a substitute for sodium.

• Toxicity Symptoms: Irregular heartbeat, heart damage, and potentially death.

Chloride

• Functions:

  • Fluid balance.

  • Removal of carbon dioxide (CO2) from blood.

  • major anion in extracellular fluid

• Locations in Body: Blood, stomach, and intracellular fluid.

Phosphorus

• Location: Mostly found in bones and teeth.

• Functions:

  • Critical component of DNA, RNA, and ATP.

  • Regulation of pH in the body.

  • best dietary source is chicken breast

  • meat, fish, poultry, and dairy are all high in phosphorus

Magnesium

• Location: Found in bones and soft tissues.

• Functions:

  • Involvement in enzymatic processes (cofactor for over 300 enzymes).

  • Pancreas function.

  • Lowers blood pressure.

  • The best dietary source of magnesium is almonds

  • involved in dna synthesis

• Toxicity Symptoms: Diarrhea, nausea, and cramps.

Sulfur

• Functions:

  • Helps the liver detoxify substances.

  • Prevents food discoloration (as sulfites).

• Sources: Sulfites are commonly found in wine.

Trace Minerals

• Definition: Trace minerals are required in amounts less than 100 mg per day but are still essential for health.

Iodine

• Function: Essential component of thyroid hormones, which regulate metabolism.

• Deficiency: Can cause goiter (noncancerous enlargement of the thyroid gland).

• Sources: Iodized salt.

Iron

• Functions:

  • Synthesis of amino acids, hormones, and neurotransmitters.

• Absorption: Heme iron (from animal sources) is more easily absorbed than non-heme iron (from plant sources).

• Absorption Enhancers: Vitamin C increases iron absorption.

• Iron is best found in meat

Zinc

• Functions:

  • Fetal and adolescent development.

  • Cofactor for enzymes.

  • Component of insulin.

  • Important for protein activity.

• Interactions: Zinc interferes with absorption of iron and copper.

Selenium

• Functions:

  • Neutralizes free radicals (antioxidant function).

  • Regulates thyroid hormone actions.

• Toxicity Symptoms: Nausea, vomiting, and nail discoloration.

Fluoride

• Functions: Strengthens bone and dental enamel, helping to prevent cavities.

• Sources: Water (fluoridated) and toothpaste.

Chromium

• Functions:

  • Carbohydrate and lipid metabolism.

  • Fatty acid and cholesterol synthesis.

  • Improves effectiveness of insulin.

Copper

• Functions:

  • Cofactor in collagen synthesis.

  • Assists in iron absorption.

  • Helps form hemoglobin.

  • Copper=collagen

Molybdenum

• Functions: Cofactor for enzymes that break down drugs, toxins, and alcohols.

Mineral Interactions and Absorption

• Some minerals can interfere with the absorption of others (e.g., calcium with iron, magnesium, phosphorus, and zinc; zinc with iron and copper).

• Vitamin C enhances iron absorption, while certain foods (e.g., spinach) can decrease calcium absorption.

Notes

• Peak bone mass is in 20's

• aldosterone causes sodium reabsorption

• methionine and cysteine both contain sulfur

• DASH diet is known to prevent hypertension

• The minerals that help the most with bone health are calcium, phosphorus, magnesium, and fluoride.

• The minerals that help the most with energy metabolism are chromium, manganese, iodine and sulfur.

• The minerals that help the most with electrolyte and fluid balance are chloride, potassium, sodium and phosphorus.

• The minerals that help the most with immunity are zinc, iron and selenium

• The minerals that help the most with blood health are copper, zinc, and iron

• Selenium is the antioxidant mineral

Summary Table: Major Minerals and Key Trace Minerals

Mineral	Main Functions	Key Sources	Deficiency/Toxicity Notes
Calcium	Bones, teeth, muscle/nerve function, blood pressure	Dairy, brassica vegetables, fish	Deficiency: Osteoporosis; Toxicity: Interferes with other minerals
Sodium	Fluid balance, nerve function	Table salt, processed foods	Excess: Hypertension, heart disease
Potassium	Fluid balance, nerve/muscle function	Fruits, vegetables	Deficiency: Muscle weakness; Toxicity: Heart issues
Phosphorus	Bones, teeth, DNA/RNA, ATP	Meat, dairy, nuts	Rare deficiency
Magnesium	Enzyme function, muscle/nerve function	Whole grains, nuts, leafy greens	Toxicity: Diarrhea, cramps
Chloride	Fluid balance, stomach acid	Table salt	Rare deficiency
Sulfur	Liver detox, food preservation	Protein foods, wine (sulfites)	Rare deficiency
Iodine	Thyroid hormone synthesis	Iodized salt, seafood	Deficiency: Goiter
Iron	Oxygen transport, enzyme function	Meat (heme), beans (non-heme)	Deficiency: Anemia
Zinc	Growth, immunity, enzyme function	Meat, seafood, whole grains	Deficiency: Growth delay
Selenium	Antioxidant, thyroid function	Nuts, seafood	Toxicity: Nausea, nail changes
Fluoride	Teeth and bone health	Water, toothpaste	Excess: Fluorosis
Chromium	Carb/lipid metabolism, insulin action	Whole grains, meats	Rare deficiency
Copper	Iron metabolism, collagen synthesis	Shellfish, nuts, seeds	Deficiency: Anemia
Molybdenum	Enzyme cofactor (detoxification)	Legumes, grains	Rare deficiency

Examples and Applications

• Example: Consuming dairy with vitamin D-fortified foods can enhance calcium absorption, while eating spinach with dairy may reduce it due to oxalate content.

• Example: Using iodized salt helps prevent iodine deficiency and goiter in populations where natural iodine intake is low.

Additional info: Academic context and examples have been added to expand on the original notes and ensure completeness for exam preparation.