As a registered dietitian nutritionist specializing in food allergies, and a food allergy mom myself, I know how overwhelming it can feel to manage restricted diets while also worrying about growth, nutrition, and balanced meals.
In my practice, nutrient concerns are one of the most common reasons families seek support.
One of the most common concerns I hear from parents is:
“How do I make sure my child is getting all the nutrients they need?”
And honestly, it is a very valid concern.
When children have to avoid major food groups due to food allergies, it can feel overwhelming trying to provide balanced meals and enough variety, especially if picky eating is layered on top of it. Many parents worry their child may be missing important nutrients needed for growth, development, energy, and overall health.
The good news is this, a healthy, balanced diet with food allergies is absolutely possible.
It may take more planning and creativity at times, but with the right approach, children with food allergies can still meet their nutritional needs and thrive.
Why Food Allergies Can Increase the Risk of Nutrient Gaps
Food allergies often require eliminating foods that naturally contain important nutrients. Some children avoid only one allergen, while others may avoid multiple foods for years.
In addition to food allergies, many children also:
- become fearful around trying new foods
- rely heavily on a small number of “safe foods”
- struggle with picky eating
- avoid eating outside the home
- have anxiety around reactions
Over time, limited food variety can make balanced nutrition more challenging for some children. While not every child with food allergies will develop nutrient deficiencies, children with multiple food allergies or highly restrictive eating patterns may need additional nutrition support.
Common Nutrients That May Be Missing in Food Allergy Diets
Protein
Inadequate protein intake may affect growth, fullness, muscle development, and overall energy intake in children.
Children avoiding:
- milk
- egg
- soy
- peanuts
- tree nuts
- fish
- or multiple allergens
may struggle to get enough protein consistently.
Allergy-friendly protein sources may include:
- chicken
- turkey
- beans
- lentils
- sunflower seed butter
- hemp seeds
- pumpkin seeds
- fortified pea protein products
- seed-based protein pastas
Many children also benefit from pairing protein with snacks instead of relying mainly on carbohydrates. If you are looking for an extensive list of allergy-friendly proteins, take a look at my post, “Best Allergy-Friendly Protein Sources”.
Calcium
Calcium is one of the biggest concerns for children with dairy allergies.
Calcium is important for:
- bone development
- teeth
- muscle function
- nerve signaling
Many dairy-free children are not automatically replacing the calcium lost from eliminating milk products.
Calcium-rich allergy-friendly foods may include:
- fortified plant milks
- fortified orange juice
- white beans
- chia seeds
- broccoli
- canned salmon with bones (if tolerated)
- calcium-set tofu (if soy is tolerated)
Not all dairy-free milks are nutritionally equal, which is something many parents are surprised to learn. Some dairy-free alternatives contain very little protein or are not adequately fortified with calcium and vitamin D.
Vitamin D
Vitamin D works closely with calcium and supports:
- bone health
- immune function
- and growth
Since vitamin D is naturally found in very few foods, children with dairy allergies may be at increased risk for low intake.
Depending on intake levels and bloodwork, some children may require supplementation under medical guidance.
Iron
Iron is essential for:
- energy
- oxygen transport
- concentration
- and growth
Children who avoid:
- fortified cereals
- eggs
- legumes
may struggle to meet iron needs.
Iron-rich allergy-friendly foods can include:
- beef
- chicken thighs
- lentils
- beans
- pumpkin seeds
- fortified wheat-free cereals
- spinach
Pairing iron-rich foods with vitamin C foods like strawberries, oranges, or bell peppers may help improve absorption as well.
Healthy Fats and Omega-3s
Healthy fats are especially important for growing children and brain development.
Children avoiding:
- fish
- nuts
- eggs
may need additional support getting enough omega-3 fats.
Options may include:
- chia seeds
- flaxseeds
- hemp seeds
- algae-based omega-3 supplements
- omega-3 fortified foods (orange juice for example)
Nutrients Commonly Affected by the Top 9 Allergens
Milk Allergy
Potential nutrients affected:
- calcium
- vitamin D
- protein
- fat
Egg Allergy
Potential nutrients affected:
- protein
- choline
- selenium
- vitamin B12
Wheat Allergy
Potential nutrients affected:
- fiber
- B vitamins
- iron
Peanut and Tree Nut Allergies
Potential nutrients affected:
- healthy fats
- vitamin E
- magnesium
- protein
Fish Allergy
Potential nutrients affected:
- omega-3 fats
- vitamin D
- protein
Soy Allergy
Potential nutrients affected:
- protein
- iron
- calcium (if fortified soy foods were used)
Every child’s diet is different, which is why individualized nutrition support can be so helpful.
Signs Your Child May Need Additional Nutrition Support
Some signs that may suggest a child could benefit from additional nutrition guidance include:
- poor growth
- very limited accepted foods
- constipation
- moodiness
- low energy
- weight loss
- difficulty gaining weight
- highly restrictive eating patterns
- increasing anxiety around food
If meals are becoming stressful or food variety continues to decrease over time, working with a registered dietitian specializing in food allergies may help identify nutritional gaps and create a more balanced approach.
Practical Ways to Improve Nutrition With Food Allergies
Focus on What Your Child CAN Eat
It is easy to become consumed by the restriction side of food allergies. Instead, try building meals around the foods your child safely tolerates.
This is what I did with my own daughter, who has food allergies to peanuts, tree nuts, egg, soy, sesame, mustard, flaxseed and chia seed. We focused on what she could eat instead of constantly focusing on restrictions. Over time, that mindset shift became a game-changer for our family.
Add Variety Slowly
Children with food allergies often need repeated exposure to new foods before accepting them. Small steps matter. Even children without food allergies need repeated exposure. Sometimes it can take up to twelve introductions before a new food is accepted. Don’t give up!
Include Protein at Meals and Snacks
Balanced meals and snacks that include protein may help support better energy levels, fullness, and overall nutrient intake.
Use Fortified Foods Strategically
Fortified dairy-free milks, cereals, and allergy-friendly products can sometimes help fill nutritional gaps.
Get Kids Involved
Children are often more willing to try foods when they:
- help grocery shop
- choose recipes
- prepare meals
- assist in the kitchen
This can help children feel more confident and involved in managing their food allergies. My son has become a little chef in his own right because of the time he has spent in the kitchen with me. And my daughter can whip up a quick meal for the whole family now.
Do Children With Food Allergies Need Supplements?
Not always.
Some children meet their needs well through food alone, while others may benefit from supplementation depending on:
- the number of allergens
- overall diet variety
- growth patterns
- bloodwork
- intake levels
Common supplements sometimes discussed with healthcare providers include:
- calcium
- vitamin D
- iron
- omega-3s
- multivitamins
Supplementation should never replace balanced meals when possible, but in some cases it may help fill nutritional gaps This is also a great topic to discuss with a registered dietitian who specializes in food allergies.
Final Thoughts on Nutrient Deficiencies in Children with Food Allergies
Managing food allergies can feel overwhelming at times, especially when nutrition concerns are added into the mix.
But parents should know this… Children with food allergies can absolutely build healthy, balanced diets.
The goal is not perfection. The goal is consistency, variety over time, and creating a positive relationship with food while meeting nutritional needs as best as possible.
Small changes truly add up.
Want a deeper breakdown of the nutrients commonly affected by each of the Top 9 allergens?
My Food Allergy Nutrient Guide includes:
- nutrient breakdowns for each allergen
- allergy-friendly replacement foods
- practical allergy-friendly recipes
- dairy-free calcium sources and calcium amounts
- allergy-friendly omega-3 sources
Created by a Registered Dietitian Nutritionist specializing in food allergies, this guide was developed to help families feel more confident navigating nutrition with food allergies.
Also, if you are looking for more allergy-friendly meal ideas and nutrition support, you can join my newsletter here.
About the Author
Elizabeth Pecoraro, RDN, is a registered dietitian nutritionist specializing in food allergies, elimination diets, and family nutrition. As both a food allergy dietitian and food allergy mom, she helps families navigate balanced nutrition while managing food allergies safely. She also works virtually with families in multiple states if you are looking for individualized support.