Essential Nutrients

What Are Essential Nutrients?

Essential nutrients are nutrients that the body cannot make at all, or cannot make in enough quantity, so they need to come from food and drinks. They support everyday functions such as movement, concentration, immunity, digestion, healthy blood, bones, nerves, and tissue repair.

A balanced eating pattern provides essential nutrients through vegetables, fruit, wholegrains, protein foods, dairy or fortified alternatives, nuts, seeds, and healthy oils. HealthHub’s nutrition guidance promotes balanced meals and highlights the importance of protein, fibre, healthier fats, and a variety of foods.

Macronutrients

Macronutrients are needed in relatively large amounts. They provide energy and the building blocks for the body.

Macronutrient	Why it is important	Food sources	Too little may cause
Carbohydrates	Main source of energy for the brain and muscles	Wholegrains, rice, oats, potatoes, fruit, beans, lentils, milk	Low energy, fatigue, poorer exercise performance, and reduced fibre intake if whole-food carbohydrates are restricted
Protein	Builds and repairs muscle, skin, organs, enzymes, and immune cells	Fish, eggs, poultry, dairy, tofu, tempeh, beans, lentils, nuts and seeds	Muscle loss, weakness, slower recovery, poor growth in children, and impaired immune function
Fats	Provide energy, support cells and hormones, and help absorb vitamins A, D, E, and K	Fish, nuts, seeds, avocado, olive, canola, peanut, sesame and soybean oils	Poor absorption of fat-soluble vitamins and insufficient essential fatty acids
Water	Supports circulation, temperature control, digestion, joints, and waste removal	Water, soups, fruit, vegetables, unsweetened drinks	Dehydration, headache, dizziness, constipation, and reduced physical performance

Choose carbohydrate foods with more fibre, such as brown rice, oats, wholemeal bread, beans, fruit, and vegetables. Choose protein from a variety of animal and plant sources, and favour unsaturated fats from fish, nuts, seeds, and plant oils over excessive saturated and trans fats.

Micronutrients

Micronutrients are vitamins and minerals needed in small amounts, but they are essential for normal health. They do not supply calories, yet they help the body use energy from food and support many chemical processes.

Type	Examples	Why it is important	Deficiency may cause
Vitamins	A, B vitamins, C, D, E, K	Support immunity, vision, nerves, blood formation, energy metabolism, bones, and tissue maintenance	Problems such as night blindness, anaemia, nerve symptoms, poor wound healing, scurvy, or weak bones, depending on the vitamin
Minerals	Calcium, iron, magnesium, potassium, zinc, iodine, selenium	Support bones, oxygen transport, nerves, muscles, thyroid function, immunity, and fluid balance	Problems such as iron-deficiency anaemia, bone weakness, muscle symptoms, impaired immunity, or thyroid-related problems, depending on the mineral

Examples include iron from lean meat, seafood, poultry, beans, and fortified grains; calcium from dairy foods, calcium-set tofu, leafy greens, and fish eaten with bones; and vitamin C from citrus fruits, capsicum, kiwi, broccoli, strawberries, potatoes, and tomatoes.

Vitamin B12 occurs naturally in animal foods rather than plants, so people following a vegan diet need dependable fortified-food or supplement planning. Vitamin D is naturally present in few foods; fatty fish and fortified foods are among the useful dietary sources.

Why Deficiency Matters

A nutrient deficiency can develop when food intake is too low for a long period, when a diet is highly restrictive, or when a health condition or medicine affects absorption or use of nutrients. For example, iron deficiency can cause anaemia, which may lead to tiredness, weakness, and low energy.

Deficiency symptoms are often non-specific. Persistent fatigue, weakness, pale skin, numbness, frequent illness, mouth sores, slow wound healing, bone pain, or unexplained weight change should be assessed by a healthcare professional rather than self-diagnosed. Singapore’s Ministry of Health encourages people to take proactive steps to manage health and seek timely, appropriate care.

Food First

The simplest way to meet essential nutrient needs is to eat a varied diet most of the time. Build meals around vegetables and fruit, wholegrains, protein foods, and healthier fats, while drinking enough water and limiting heavily processed foods high in added sugar, sodium, and saturated fat.

No single food supplies every nutrient. Variety across the week is more important than trying to find one “perfect” food or following a highly restrictive eating plan without professional guidance.

https://www.healthhub.sg/well-being-and-lifestyle/food-diet-and-nutrition https://ods.od.nih.gov/factsheets/list-all/ https://www.moh.gov.sg/