Your Body is Changing. So are Your Nutrition Needs

You're growing, changing, building, and running a surprisingly complicated biological operation. Here's what your body actually needs from you right now

YOU ARE A BEAUTIFUL WORK IN PROGRESS

This is an important period of growth and development happening right now. The things you eat, the energy you take in, and the rest you get all help support the work your body is already doing. You are still becoming which means your body may do things that feel confusing. You may suddenly be hungrier than you used to be. You may need more sleep. Your body may change shape. You may grow taller, broader, curvier, stronger, or simply differently from the people around you. Your journey is unique to you.

FUEL THE BUILD

Let's start with the big one: your body needs enough food.

Not enough food to look a certain way. Not enough food to keep the number on a scale from changing. Enough food to support the actual work your body is doing. Food provides energy for everything from walking through the halls to thinking through a Math test. It fuels sports, movement, and exercise. It supports growth. Your brain uses energy. Your muscles use energy. Your body needs energy simply to keep you alive while you're sitting on the couch doing absolutely nothing. And during adolescence, you're asking your body to do all of that while also growing. So if you find yourself hungrier than you used to be, that isn't automatically a sign that you've lost control or that you're doing something wrong. 

CARBS, FAT, AND PROTEIN ALL HAVE JOBS

One of the most confusing things about nutrition is that every few years, someone decides one food or nutrient is the hero and another one is the villain. Right now, protein is having a moment. Carbohydrates were an enemy for years, and fat... well, fat has been through a lot in the public eye. But the truth is, they are all important to a healthy diet.

Carbohydrates are one of your body's main sources of energy. Your brain uses glucose, your muscles use carbohydrates during activity, and carbohydrate-containing foods provide far more than just energy. Fruit, beans, oats, potatoes, rice, bread, and other grains can all play a role in a healthy diet.

Fat is not the enemy. Dietary fat provides energy, helps your body absorb certain vitamins, and supplies essential fatty acids your body needs. Eating less fat does not earn you extra health points. Protein is very important, especially during a period of growth. Your body uses protein to build and repair tissues and to make substances involved in countless processes throughout the body. But protein is not the entire nutritional story. You cannot build a house with lumber and forget about the foundation, electricity, plumbing, tools, and everyone else doing the work. Your body is the same way.

Protein matters. But so do carbohydrates. So does fat. So do vitamins and minerals. And none of them work particularly well if you're not eating enough overall.

VARIETY IS ACTUALLY ESSENTIAL

You don't need to memorise every vitamin and mineral your body uses. Nobody is expecting you to become a walking nutrition label, but there are a few nutrients worth paying attention to during adolescence because your body has a particularly high need for them.Iron is a big one for girls after your period starts. Iron helps your body make haemoglobin, a protein in red blood cells that carries oxygen. Girls ages 14 to 18 have a higher recommended iron intake than boys the same age because menstruation increases iron losses which can lead to a deficiency called anaemia. The 2025 Dietary Guidelines Advisory Committee identified iron as a nutrient of public health concern for adolescent girls. Anaemia increases again for women who become pregnant or during breastfeeding, so understanding how to manage your iron levels can go a long way to keeping you healthy for your whole life!Then there are calcium and vitamin D. Adolescence is an important time for building bone. You are literally building some of the bone strength that will support you decades from now.Nutrition during adolescence matters. They key takeaway from this section is that your body needs a variety of fruits, vegetables, grains, beans, meat, fish, eggs, dairy and fortified alternatives, nuts, seeds, and other foods which all bring something different to the table. And what's interesting is that eating certain foods together actually unlocks the ability of some foods to release their micro and macronutrients more efficiently. For example, eating iron rich foods with a vitamin C rich fruit or vegetable (think steak with green beans) allows your body to absorb the Iron more fully. So don't just eat a variety of foods, eat a variety of foods together to give your body more opportunities to get what it needs.

YES, YOU'RE ALLOWED TO BE HUNGRY

This deserves its own section because a lot of girls have been taught, directly or indirectly, that hunger is something to defeat. It's not.Hunger is a signal. It's your body telling you it needs fuel — for walking through the halls, for practice, for actually thinking during a test. What you fuel it with matters, not because some foods are "good" and others are "bad," but because different fuel does different things.

Foods with real nutrients: protein, fiber, healthy fats, take longer to break down, which means they keep you fueled for longer. Think eggs, Greek yogurt, string cheese, a handful of nuts, an apple with peanut butter, hummus and veggies, or oatmeal — the kind of stuff that actually holds you over. Highly processed foods and a lot of what's marketed as a quick snack, spike your blood sugar and drop it again just as fast which is often why you're hungry again an hour later even though you just ate. That's not a willpower problem. That's just how the fuel works.

That doesn't mean treats are off-limits. An ice cream sandwich isn't a crisis, and it's not moving the needle on your health one way or the other. It just means that when you're actually hungry, reaching for something with real staying power usually works better than reaching for the quick snack.

Now let's talk about fullness. Learning to notice when you're hungry and when you're satisfied is not the same thing as following a rigid set of rules. It means paying attention to what your body is telling you instead of trying to override it. Some days you'll be hungrier. Some days you won't be. That is normal.

SLEEP IS PART OF THE PLAN

You know how adults freak out when they see a teenager sleeping until noon as if civilisation is collapsing? Well, sleeping a lot right now is actually normal. Your body is doing an enormous amount of work during adolescence, and sleep is an important part of health, recovery, learning, and development. Teens ages 13 to 17 are generally recommended to get 8 to 10 hours of sleep per 24 hours. Yet most high school students don't get enough sleep on school nights. So all of that sleeping in does not automatically mean you're lazy. It means you're human. That doesn't mean staying up until 2 a.m. watching videos and then sleeping through your alarm is the perfect health strategy. But the expectation that teenagers should be able to function indefinitely on very little sleep is not realistic either. Your body needs fuel and time to rest.

YOUR BODY HAS ITS OWN BLUEPRINT

Your families have passed down a wonderful tapestry of genetics that will heavily influence things like height, frame, natural body proportions, the timing and pattern of development, and whether you have green eyes or can roll your tongue into a U shape. The beautiful thing about this is that none of it arrived by accident. Every trait you carry is proof that someone before you survived long enough, and thrived long enough, to pass it forward. You are, quite literally, the living evidence that every person in that chain made it. That's not a script you're stuck following. It's an inheritance you get to carry forward in a body that's never existed before and never will again. 

Which means comparing yourself to the girl next to you was never really a fair fight. You're not running the same race, you're not built from the same tapestry, and you never were. Envy usually points at the wrong target anyway. If there's something you admire in someone else: her confidence, her strength, the way she carries herself, that's worth noticing. But it's not a standard you failed to meet. It's information about who you want to become. Let it point you forward instead of making you feel behind, and when you see another girl doing something well, tell her. Lifting someone else up costs you nothing, and it's a far better use of your energy than measuring yourself against her.The goal of nutrition should not be to force your body into someone else's blueprint. The goal is to give your body what it needs to grow, move, think, recover, and become the healthiest, strongest version of itself, because health and worth are not determined by how closely your body resembles a trend. Your future is not predetermined, it's yours to build, one real meal and one good night's sleep at a time. 

WHERE THIS SERIES GOES FROM HERE

This is article one of a series on what a growing body actually needs — and the noise it has to filter out along the way. Next up: why your feed is full of people trying to sell you a shake, a gummy, or a "fix" for a body that was never broken, and how to spot the difference between real nutrition information and a sales pitch.

For now: your body isn't a project to perfect. It's doing real work, and it deserves real food, real rest, and a little patience. If you're ever unsure whether what you're feeling is normal, a parent, doctor, or school nurse can help you figure it out.

Want to go a little deeper?

Maybe you're wondering whether you're eating enough. Maybe you're exhausted all the time. Maybe you're an athlete trying to figure out how to fuel your body. Maybe you're just trying to make sense of what is changing and why.