In short

A vegetarian diet can be safe and healthy for teen girls, as long as it includes enough iron, protein, vitamin B12, calcium, and omega-3s. 

The biggest risk is low iron, which can cause tiredness and worsen heavy periods. Build meals around beans, eggs, dairy, nuts, tofu, and wholegrains, and pair iron-rich foods with vitamin C to help her body absorb it.

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Why has my daughter decided to go vegetarian?

Most teen girls go vegetarian for ethical, environmental, or health reasons, or because friends are doing it. It's a normal part of forming her own identity and values.

You don't need to talk her out of it. Teens who feel listened to are more likely to make balanced choices around food, so it's worth asking what's behind the decision and hearing her out. 

She may want to reduce animal harm, lower her carbon footprint, or just try something new.

Some girls also use vegetarianism to take more control over what they eat, which can occasionally tip into restrictive eating. More on that below.

Is a vegetarian diet safe for a teenage girl?

Yes, a well-planned vegetarian diet is safe and can be very healthy for teenage girls. NHS guidance confirms that vegetarian diets can meet all the nutritional needs of growing teens, provided they include a variety of foods.

The key phrase is well-planned. Teen girls have higher nutritional needs than adults: they're still growing, building bone density, and losing iron every month through their periods. 

Cutting out meat without replacing the nutrients it provides is where things go wrong.

What nutrients does my vegetarian teen need most?

Five nutrients matter most for vegetarian teen girls: iron, protein, vitamin B12, calcium, and omega-3 fats. These are the ones most commonly low in vegetarian diets.

Here's where to find them without meat:

• Iron: lentils, beans, tofu, fortified breakfast cereals, dark leafy greens, dried apricots 
• Protein: eggs, dairy, beans, lentils, chickpeas, tofu, nuts, seeds, quinoa 
• Vitamin B12: dairy, eggs, fortified plant milks, fortified cereals (a supplement is needed if she's also avoiding dairy and eggs) 
• Calcium: milk, yoghurt, cheese, fortified plant milks, leafy greens, sesame seeds 
• Omega-3s: flaxseeds, chia seeds, walnuts, rapeseed oil, fortified eggs

A daily multivitamin can be a useful safety net, especially in the first few months of going vegetarian. 

For more on supplements, read luna’s article on what vitamins a teenage girl should take daily.

What should my vegetarian daughter eat in a day?

A balanced day for a vegetarian teen girl includes 3 meals plus 1 to 2 snacks, with protein and iron-rich foods at most meals.

Here's a simple example:

• Breakfast: porridge with milk, banana, peanut butter, and a glass of orange juice
• Snack: Greek yoghurt with berries and a handful of almonds
• Lunch: wholegrain wrap with hummus, grated cheese, spinach, and roasted peppers
• Snack: fortified cereal with milk
• Dinner: lentil and vegetable curry with brown rice and a side of broccoli

You don't have to cook separate meals. Most family dinners can be adapted by swapping the meat for beans, lentils, eggs, tofu, or a quality meat replacement.

How do I make sure she gets enough iron?

Iron is the single biggest concern for vegetarian teen girls, especially once periods start. Plant-based (non-haem) iron is harder for the body to absorb than the iron from meat, and girls lose iron every month through their period.

To help her absorb more iron from food:

• Pair iron-rich foods with vitamin C, like orange juice, peppers, kiwi, or tomato 
• Avoid tea or coffee with meals, as they block iron absorption 
• Include eggs and dairy if she still eats them 
• Check breakfast cereals for added iron and choose fortified ones

Signs of low iron in teen girls include feeling tired all the time, looking pale, getting out of breath easily, headaches, and brittle nails. If you notice these, book a blood test with her doctor.

What if she's vegetarian and on her period?

Periods make iron even more important for vegetarian teen girls, because she loses blood, and iron, every month. Heavy periods plus a low-iron diet can cause iron-deficiency anaemia in teen girls.

If her periods are heavy, long, or leaving her exhausted, talk to her doctor: she may need a simple blood test and, in some cases, an iron supplement.

You can also help at home by including iron-rich meals around her period, like lentil soup with a vitamin C-rich side, or a chickpea curry with peppers.

Should I take her to the doctor about going vegetarian?

You don't need a doctor's appointment just because she's gone vegetarian, but it's worth booking one if any of the following apply:

• She's also cutting out other food groups like dairy or carbs 
• She has a heavy menstrual period or she's often exhausted 
• She's losing weight without trying 
• She's becoming anxious or rigid around food 
• You're worried about her growth or energy levels

A doctor can run a simple iron and B12 blood test and reassure both of you.

What if I think this is a sign of disordered eating?

Sometimes "going vegetarian" can be a way for a teen girl to start restricting food without raising alarm bells. This doesn't mean every vegetarian teen is heading toward an eating disorder, but it's worth knowing the difference.

Warning signs to watch for:

• Cutting out more and more food groups over time 
• Counting calories or weighing food 
• Skipping meals or eating less than the rest of the family 
• Losing weight
• Missing periods or feeling cold all the time 
• Becoming secretive, anxious, or rigid around food

If you're worried, speak to her doctor early. Eating disorders are treatable, and early intervention makes a real difference. Beat (the UK eating disorder charity) also runs a free helpline for parents.

FAQ

Is a vegetarian diet better than eating meat for teens?

Not necessarily. A well-planned vegetarian diet and a well-planned omnivore diet can both be healthy for teens. What matters most is variety, protein at each meal, and enough iron, calcium and B12.

Can my vegetarian daughter still grow normally?

Yes. Teen girls who eat a balanced vegetarian diet grow normally and hit puberty milestones at the same time as their meat-eating peers.

What's the difference between vegetarian, pescatarian, and vegan?

A vegetarian doesn't eat meat or fish. A pescatarian eats fish but no meat. A vegan avoids all animal products, including dairy, eggs, and honey. 

Vegan teens have higher supplement needs, especially for B12.

Does my vegetarian teen need supplements?

Most don't, if she eats a varied diet that includes dairy and eggs. A daily multivitamin with iron is a useful safety net, especially during the first year. Vegan teens usually need a B12 supplement.

What if she only eats beige food?

Picky eating plus vegetarianism can mean she's living on pasta and cheese. That's fine occasionally, but it won't give her the iron, protein, or veg she needs long-term. 

Try adding one new vegetarian protein source a week, like hummus, scrambled eggs, baked beans, or lentil pasta.

What to remember 

Going vegetarian can be a positive, values-led choice for your daughter, and one of the easier ways to get teens engaged with what they eat. 

The main thing is making sure her plate has enough of the right stuff, especially iron. If you want to learn more about diet for your daughter, check out luna’s guide on healthy eating for teenage girls. 

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