Food First: Why Even Healthy Kids Can Still Have Nutrient Gaps

If there is one thing I want parents to understand about our approach to supplements, it is this:

Diet is more important than any supplement I could formulate.

Whole foods provide a combination of nutrients, fiber, protein, fats, carbohydrates, and plant compounds that a powder or chew cannot recreate. I want children learning to eat a wide variety of foods and building healthy habits that can last into adulthood.

Healthy families can still have gaps

At the same time, I do a lot of nutritional evaluation in my pediatric practice, including laboratory testing when it is clinically appropriate. I regularly see nutrient gaps even in children whose families are very intentional about healthy eating.

That does not mean the parents are doing anything wrong. It means children are human.

Appetites fluctuate. Preferences narrow. Growth changes needs. Sports schedules get busy. Some kids barely touch fish. Others avoid dairy. Some live on a very short list of accepted foods for months at a time.

National data point in the same direction. A large analysis of U.S. children found that calcium and vitamin D intakes were low for many kids. Even when supplements were counted, more than a third of children still fell short on both.

A “healthy diet” can look very different from child to child

Two children can both have families who care deeply about nutrition and still eat very differently.

One may love vegetables but rarely eat fish. Another may drink plenty of milk but eat very little iron-rich food. A vegetarian child, a competitive athlete, and a very selective eater can all have different nutritional patterns even if their parents are equally thoughtful.

That is why I try not to label diets simply “good” or “bad.” I want to know what the child actually eats over time.

A healthy diet is not one perfect plate

I do not believe parents need to create a flawless meal every time. What matters more is the pattern over weeks and months: variety, enough total energy, protein, fruits and vegetables, healthy fats, whole-food carbohydrate sources, and age-appropriate portions.

If you think your kids are picky, try feeding seven of them. It still amazes me how children raised in the same house, at the same table, can eat so differently. What we have landed on is not fancy: a healthy option is on the plate at most meals, whether or not it gets eaten, because exposure matters. And we have been trying to save meal delivery for true emergencies. Some weeks go better than others, and that is okay.

Kids also learn to eat gradually. Repeated exposure matters. Family meals matter. Seeing adults eat a wide range of foods matters. That is a much longer game than whether broccoli was eaten on Tuesday night.

Growth and activity can change the picture

Children are not small adults with fixed needs. Growth spurts, puberty, sports, illness, changes in appetite, and changes in food preferences can all shift nutritional intake.

This is particularly obvious in active children. A child can be eating “healthy foods” and still not be eating enough overall for their growth and activity level. Quality matters, but quantity matters too.

What I look at before I reach for a supplement

I start with the diet history. What does breakfast actually look like? What are the reliable protein foods? Is the child eating fruits and vegetables? Are there entire food groups missing? What happens on school days, sports days, and weekends?

Those questions often tell me more than a marketing claim on a bottle.

Where laboratory testing can help

Sometimes a child’s history, symptoms, growth pattern, or medical context makes testing useful. In those situations, laboratory results can help answer a specific question and guide a more targeted plan.

I do not recommend running huge panels on every healthy child simply because testing exists. Testing should have a purpose.

When targeted support makes more sense than “more of everything”

If a specific deficiency is identified, the answer may be a targeted nutrient rather than a bigger multivitamin. That distinction matters.

Iron is a good example. It is an essential nutrient, but it is not something I want parents adding casually in high amounts just because “more nutrition” sounds better. The same principle applies to other nutrients with narrower safety margins.

Where a multivitamin fits

To me, a multivitamin belongs after the food conversation, not before it.

It should complement a child’s diet, not excuse a poor one. For some families, a basic multivitamin can serve as a practical nutritional backstop. For others, it may add very little because the child already eats a broad and varied diet.

There is no prize for taking the most supplements.

What I tell parents who are doing their best

I want parents to know that nutrition does not need to become another area of perfectionism.

A child can eat a healthy diet and still have pizza. A child can be a great eater and still go through a picky phase. A family can care deeply about nutrition and still use convenience foods on a busy night.

The goal is not perfect eating. The goal is a strong pattern over time.

My bottom line

Food first. Supplements where useful. Individual care when needed.

That is a much less exciting message than promising that one scoop fixes everything—but it is the message I believe, both as a pediatrician and as a mom.

— Dr. Katie Good, MD

Sources & further reading

This article is for general education and is not a substitute for individualized medical advice. If you have questions about your child’s nutrition, supplements, growth, medications, or laboratory results, talk with your child’s pediatrician or healthcare professional.

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