Parents often come to me after months of wondering whether something is really wrong.

Their teenager is exhausted despite seemingly getting enough sleep. They’re struggling to concentrate, their mood has changed, or they seem to crash completely after school. Perhaps digestive problems — bloating, constipation, loose stools or stomach discomfort — have become so frequent that everyone has gradually accepted them as normal.

And then there is the question many parents ask themselves: Is this just being a teenager?

Adolescence is a period of enormous change. Bodies are growing, hormones are shifting, academic and social pressures are increasing, sleep patterns change and teenagers are beginning to take much more control over what, when and how they eat. Some fluctuation in energy, appetite and mood is completely normal.

But that doesn’t mean every symptom should automatically be dismissed as a phase.

If something has changed significantly, is persisting, or is interfering with your teenager’s everyday life, it is worth paying attention to. Depending on the symptoms, that may mean speaking with their GP first. It can also mean looking more closely at some of the foundations that support a growing body — including nutrition.

Nutrition may be one piece of a much bigger picture

Fatigue, poor concentration, changes in mood and digestive symptoms can have many possible causes, and nutrition is only one part of that picture. But it is an important part.

Teenagers have considerable nutritional demands. They are growing rapidly while often navigating early mornings, long school days, sports, homework, social lives and increasingly independent food choices. It is surprisingly easy for what they need and what they are actually eating to drift apart.

Sometimes the issue is simply that there isn’t enough food coming in consistently. Sometimes meals are filling but provide very little protein, fibre or micronutrient variety. Iron, vitamin B12, folate and vitamin D are among the nutrients we may want to think about depending on the individual, their diet and their symptoms.

Digestive health can matter too. Persistent constipation, diarrhoea, bloating or abdominal discomfort shouldn’t simply become something a teenager learns to live with. Understanding when symptoms happen, what else is going on and whether further medical investigation is appropriate is much more useful than immediately removing foods from their diet.

The aim isn’t to find a nutritional explanation for everything. It is to ask whether nutrition could be contributing to what we are seeing — and, if so, what we can reasonably do about it.

Teenagers need a different kind of nutritional support

Working with a teenager is not the same as working with an adult.

Their relationship with food is still developing. They are beginning to make their own choices and naturally want more independence from their parents. At the same time, much of their food environment is still determined by family routines, school schedules and what is available at home.

That makes the way we approach nutrition particularly important.

A teenager who already feels exhausted, overwhelmed or uncomfortable in their body does not need another adult giving them a long list of things they are doing wrong. Nor do I want food to become something they feel they have to control perfectly in order to be healthy.

I’m much more interested in working out what would genuinely help.

Maybe breakfast needs to be something they can actually eat at 7.30 in the morning rather than the breakfast we think they should want. Perhaps lunch needs to be more substantial without looking dramatically different from what their friends are eating. Maybe the first step has nothing to do with removing foods and everything to do with eating enough of them.

When teenagers understand why we are suggesting something and have some ownership over how they do it, nutrition becomes collaborative rather than corrective.

That distinction matters.

Food can influence energy, mood and concentration

One of the simplest places to start is often looking at how a teenager is eating across the day.

It isn’t unusual to see very little breakfast, a light or carbohydrate-heavy lunch, followed by intense hunger when they arrive home from school. By that point, they may be exhausted, irritable and desperate for something quick.

That pattern can easily be interpreted as poor food choices or lack of self-control when, in reality, they may simply be hungry.

Regular meals containing a combination of protein, carbohydrates, fats and fibre can help provide more sustained energy across a demanding school day. Rather than becoming overly focused on avoiding sugar or controlling blood glucose, I prefer to look at what we can add to make meals more nourishing and satisfying.

Could breakfast contain more protein? Could something be added to lunch so it carries them further? Do they need a proper after-school snack because dinner is still several hours away?

Often these are very ordinary changes. They can also be surprisingly powerful.

Digestive symptoms deserve curiosity, not restriction

When a teenager is experiencing bloating, pain or changes in bowel habits, it can be tempting to immediately start removing foods.

Dairy goes. Then gluten. Then perhaps sugar.

Before long, a young person who already wasn’t eating particularly well may have an even narrower diet.

There are situations where dietary changes are appropriate, but I don’t think restriction should be our automatic starting point. First, I want to understand what is actually happening:

• Are they constipated?
• Are they drinking enough?
• Are meals irregular?
• Is there enough fibre — or has fibre suddenly increased dramatically?
• o symptoms happen around stressful periods at school?
• Are they rushing meals?
• Is there a pattern with particular foods?
• Are there symptoms that should be discussed with their doctor?

The gut and the nervous system also communicate constantly. This is one reason digestive symptoms can become more noticeable during periods of stress. That doesn’t make the symptoms imaginary. It simply reminds us that digestion doesn’t happen in isolation from the rest of the body or from what is happening in a teenager’s life.

Small changes are usually a better place to begin

When a parent has been worried for months, there is an understandable desire to fix everything quickly.

But teenagers rarely need their entire lives overhauled.

Sometimes we begin with breakfast. Sometimes it is hydration, or getting something substantial into the school lunch. Perhaps it is finding two snacks they actually like that contain more than a quick hit of energy. Sometimes it is simply helping a family understand what their teenager needs nutritionally at this stage of life.

One change that a teenager understands and is willing to make is often more valuable than ten recommendations they have no interest in following.

From there, we can observe.

Is their energy changing? Are they getting through the school day more comfortably? Is digestion improving? Are they less ravenous in the evening? Is concentration any different? Do we need to investigate something further?

That gives us somewhere sensible to go next.

If you feel that something has changed, pay attention to it

Parents know their children.

You know when your teenager is simply tired after a busy week, and you also know when they haven’t seemed quite themselves for months.

That doesn’t mean you need to diagnose what is happening. And it certainly doesn’t mean nutrition will always be the answer. Persistent fatigue, significant mood changes, unexplained weight changes, ongoing gastrointestinal symptoms or anything else that concerns you deserves appropriate medical attention.

But alongside that, there can be enormous value in looking carefully at the everyday foundations: what they are eating, whether they are eating enough, how they are sleeping, what their digestion is doing, how much pressure they are under and what their body may be asking for during a period of very rapid growth.

You don’t need to arrive with the answer.

Sometimes the best place to start is simply with the feeling that something isn’t quite right — and a conversation about what might be worth looking at next.

About Daniela Alves

I’m Daniela Alves, a qualified Nutritional Therapist and founder of Nutrifika. I specialise in supporting mental wellbeing, stress, digestion, and immunity, as well as family nutrition — guiding clients back to balance when life feels out of sync. I was drawn to nutritional therapy through a deep curiosity about the connection between food, wellbeing, and the pace of modern life.

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