Minerals in Food: Types, Functions and Everyday Indian Sources

Minerals are inorganic nutrients that the body cannot manufacture, so they have to come from minerals in food and drink. Some are needed in comparatively larger amounts and others only in traces, yet both groups are essential when they perform a required biological role. Minerals do not provide calories, but they help nerves communicate, muscles contract, oxygen move around the body, fluid stay balanced and enzymes carry out thousands of reactions.

Major minerals and trace minerals

Calcium, phosphorus, magnesium, sodium, potassium, chloride and sulphur are commonly classed as major minerals. Iron, zinc, iodine, selenium, copper, manganese, fluoride, chromium and molybdenum are required in smaller amounts.

"Trace" describes quantity, not importance. It does not mean optional. It means the amount needed is small, which is also why careless high-dose supplementation can overshoot it.

Why the body needs minerals

Calcium and phosphorus contribute to bones and teeth; magnesium participates in hundreds of enzyme reactions; sodium and potassium help fluid balance and nerve signalling. Iron carries oxygen, iodine supports thyroid hormone production and zinc contributes to immune function and wound healing.

No single mineral works independently of the rest of the diet, and no single food supplies every mineral in ideal amounts. That is why variety across the week matters more than any one "superfood".

Everyday Indian sources of minerals in food

A vegetarian pattern can cover many minerals through ordinary meals:

• •Calcium: milk, curd, paneer, calcium-set tofu, ragi and some fortified foods.
• •Iron: dal, beans, chickpeas, green leafy vegetables and fortified staples.
• •Magnesium and zinc: nuts, seeds, whole grains and pulses.
• •Potassium: fruit, vegetables, dal and curd.
• •Iodine: iodised salt, a reliable and practical public-health source. Pink or rock salt may not reliably supply it.
• •Selenium: content in plant foods varies with the soil they were grown in.

Absorption changes the picture

The amount of a mineral in a food is not the same as the amount the body absorbs. Vitamin C alongside plant (non-haem) sources of iron improves absorption, so pairing dal or greens with lemon, amla, tomato or guava is useful. Tea or coffee taken with an iron-rich meal may reduce absorption.

Phytates in grains and pulses can reduce absorption of iron and zinc. Soaking, sprouting, fermentation and cooking may help reduce phytate and improve digestibility, although they do not make any food nutritionally perfect. This is not a reason to avoid pulses; it is a reason to build dietary variety and use sensible preparation.

Salt deserves a balanced conversation

Sodium is essential, but many diets contain more than needed through packaged snacks, pickles, sauces and restaurant meals. Cutting all salt is not the goal for most people. Cook mostly from basic ingredients, taste before adding more and keep iodised salt within an appropriate total.

Potassium-rich foods such as dal, vegetables, fruit and curd can support a balanced pattern. Anyone with kidney disease or taking medicines that raise potassium should follow individual advice instead of switching to salt substitutes automatically.

Symptoms are rarely specific enough

Fatigue, cramps, hair fall or brittle nails are nonspecific and do not prove a mineral deficiency. Fatigue might accompany iron deficiency, but it can also reflect poor sleep, thyroid disease, infection or low mood. Muscle cramps do not automatically prove magnesium deficiency, and hair changes alone cannot identify zinc status.

A useful assessment starts with symptoms, diet, medical history and selected tests rather than a broad commercial panel. Results should be interpreted with reference ranges and inflammation in mind. Taking iron without confirmation can hide the real cause of symptoms or create side effects.

When supplements become risky

A multivitamin-mineral tablet can look like insurance, yet more is not a stronger safety net. Minerals can compete with each other, accumulate in the body or irritate the digestive tract:

• •Excess iron can be toxic, so keep supplements well away from children.
• •Too much zinc can contribute to copper deficiency.
• •Excessive selenium can damage hair and nails.
• •High potassium can be risky when kidney function is reduced.
• •Calcium, iron and magnesium products may interfere with some thyroid medicines and antibiotics, so separate them when a clinician or pharmacist advises it.

The safest dose depends on age, pregnancy, laboratory findings, diet and medicines. Products exceeding daily requirements deserve a clear clinical reason. For most people, getting minerals in food first, and supplementing only for a confirmed need, is the more reliable approach.

Editorial sources

• •NIH Office of Dietary Supplements: Mineral Fact Sheets
• •Indian Food Composition Tables, ICMR-NIN