What Nutrients Do, Explained Simply for Kids

Food groups tell kids which foods to mix. Nutrients explain why the mix matters. A nutrient is a substance in food that the body uses to grow, move, repair itself and stay running. This guide explains seven of them in plain language for ages 8–12. The facts come from MedlinePlus, the U.S. National Library of Medicine’s health information site.

The seven, at a glance

A closer look

Carbohydrates: fuel

Carbohydrates come in three forms. Sugars occur naturally in fruit and milk, and are also added to foods like candy and soda. Starches are found in beans, potatoes, corn and grains. Fiber is the third type. Whole grains and beans give starch and fiber together, while refined grains usually have less fiber.

Kid analogy: Carbohydrates are like the fuel in a car. Your brain and muscles use them all day.

Protein: builder

Proteins are made of smaller pieces called amino acids. Some amino acids your body can make, and others (called “essential”) must come from food. You can get protein from animals or plants. MedlinePlus notes you don’t need to eat animal products to get all the protein you need.

Kid analogy: Amino acids are like LEGO bricks. Your body takes apart the protein in food and rebuilds the bricks into what it needs.

Fats: energy and vitamin helper

Fat supplies energy, and it helps your body absorb the fat-soluble vitamins (A, D, E, K). The 2025–2030 federal guidelines made Healthy Fats its own food group. See healthy fats explained for kids.

Fiber: the mover

Your body can’t digest fiber, and that’s the point. Fiber adds bulk, which helps food move through your intestines and helps prevent constipation. Most high-fiber foods have two kinds of fiber, so eating a variety of plants covers both.

Vitamins: specialists

Your body needs 13 vitamins. A few examples:

• Vitamin A helps keep eyes, skin, teeth and bones healthy.
• Vitamin C helps heal cuts and helps your body take in iron.
• Vitamin D helps your body absorb calcium for strong bones and teeth.

Some vitamins (A, D, E, K) are stored in the body’s fat. Others (C and most B vitamins) aren’t stored well, so you need them more regularly. MedlinePlus says the best way to get the vitamins you need is a balanced diet.

Minerals: big and tiny amounts

Minerals help your body build bones and keep muscles, heart and brain working. Your body needs larger amounts of some (like calcium) and tiny amounts of others (like iron, a “trace mineral”).

Try it: Find calcium and iron on a Nutrition Facts label. The FDA lists both, along with fiber, vitamin D and potassium, among the nutrients most people should get more of.

Water: the transporter

More than two-thirds of the body’s weight is water. Water helps control body temperature through sweat, forms saliva, cushions joints and helps move food through the digestive system. Food counts too: soups, milk and juicy fruits and vegetables all add water. See drinks for kids: water and milk.

Keeping it accurate (and calm)

• No single “super” nutrient or food. Each nutrient does different jobs, and they work together. Variety across the six food groups is the practical way to cover them.
• Skip the hype. Package and ad phrases like “boosts immunity” or “superfood” are marketing language, not explanations. Older kids can practice spotting them.
• Supplements are a doctor’s question. MedlinePlus calls a balanced diet the best way to get vitamins and notes that most people get the minerals they need from a varied diet. If you’re wondering whether a child needs a vitamin or mineral supplement, ask the child’s doctor rather than guessing.
• No grams or calorie counting for kids. Labels show numbers. For children, the goal is understanding, not tracking.

Classroom and home activities

Nutrient job cards (ages 8–10, 20 minutes). Write each nutrient on a card and each “job” on a separate card (fuel, builder, mover, cooler, specialist, bone builder, vitamin helper). Partners match them, then add one food example they know. Children with limited English can draw the food instead of writing it.

Nutrient detective (ages 9–12, 30 minutes). Use the nutrition label detective worksheet to find protein, fiber, calcium and iron on a practice label. Then compare it with a clean, empty package an adult provides. The full activity is reading a Nutrition Facts label with kids.

Group-to-nutrient map (ages 9–12). Draw the six food groups. Using the table above, add arrows to the nutrients each group is known for. Children will notice that many arrows cross, since most foods contain several nutrients. Sort foods first with the sorting tool.

For questions about a particular child’s nutrition, growth or a medical diet, talk with the child’s doctor or a registered dietitian.