What Causes Picky Eating

food choices & feeding mood learning & behaviour parenting

So you’ve decided that now is the time to take control of your family’s health. You’ve decided to make more time to try new foods and prepare family meals. You’re ready for some change and excited to make it happen.


You cook a fantastic meal with new foods from the market, excited to share in a culinary adventure with your family and nourish their little bodies.


But then reality hits.


I don’t like this

Maybe there are tears. Full plates go into the compost (or on the floor). Pouts. Sneers.

Thirty minutes later it’s, “Mama, I’m hungry”.

More tears.


You’re certainly not alone if you have a child who is a picky eater. But here’s the thing. You are trying to do the right thing. You are trying your darndest to feed your kids healthy, nourishing food. And I want to motivate you to keep on doing that.



What Causes Picky Eating In Kids?

Don’t let the behavior of your kids interfere with the health goals you’ve set for them.  Instead of caving and cracking out the kid's meal because "my gosh they have to eat something", let me help you do what parents in our community are learning to do every day – apply an understanding of the body to look under the hood and see what the problem actually is. 

I want you to take a deep breath, look at your child with curiosity and compassion and discover what is driving this picky eating behavior in order to uproot it from the inside.

When I help families shift picky eating I focus them in on these three potential driving forces:

  1. Nutrient deficiencies that interfere with hunger, appetite and satiety
  2. Poor digestive function that results in yeast overgrowth, cravings and food aversions
  3. Social factors like power struggles and anxiety

In some cases, there is a fourth factor that has to do with oral motor control or phobias but those things often get a heck of a lot better once the three factors I listed are addressed.




Most People Take An Incomplete Approach

Most of what you'll read about resolving picky eating focuses on driving force #3.... your child is trying to assert some control, gain some power, engage in a battle that they can, honestly, usually win (unless you're ready to pin them down and force-feed them, which most of us will stop short of!)

This can be part of the picture for some kids. And if it is the "just keep offering, they'll eat when they're full" approach that is often recommended is likely to work just fine within a few weeks (or months) of you holding your ground. 

But if you've given that approach a good solid try (and I mean you've really stuck to it and have been consistent, the way I talk about doing in my book) and if that's still not working, there might be something else going on.

There might be biological contributors to your child's behavior... things going on deep inside that make them behave the way they're behaving.  



Top Nutrient Deficiencies That Can Contribute To Picky Eating:

In this blog post I want to talk about driving force #1 on the list – nutrient deficiencies - that reduce appetite, hunger and influence our senses. 

==> You can learn about the other two in this handy-dandy info graphic.

Put it on your fridge to remind yourself that your kids are not, in fact, trying to drive you around the bend. They are reacting to something.

But back to driving force #1. Here are the top three nutrient deficiencies that can contribute to picky eating behavior.


Nutrient #1: Zinc

Zinc is involved in over 300 chemical reactions in the body. It is involved in immune function, cell synthesis, skin and wound healing, enzyme production, and, most significantly to this discussion, taste and digestion.

Studies have shown a relationship between low zinc status and a reduced sense of taste and smell. This is probably because zinc is needed for the production of salivary enzymes and is also needed to maintain healthy taste buds.

What do unhealthy taste buds, low salivary enzymes, and poor sense of taste and smell look like? Selective eating behavior.

Zinc is also needed for the proper secretion of stomach acid, low levels of which can reduce appetite and interfere with protein digestion specifically.

Long term zinc deficiency can also affect the central nervous system so profoundly that perception is completely altered. In this respect, high dose zinc supplementation has even been used in the treatment of anorexia nervosa, when a person’s perception of their body and its nutritional requirements does not match the actual reality.

Here are some other signs of zinc deficiency:

  • low sense of taste and smell
  • acne
  • frequent infections (like lung or ear)
  • white flecks on the fingernails
  • cracking and soft fingernails
  • eyes very sensitive to sunlight
  • highly sensitive to sugar
  • regularly dry, cracked, chapped lips
  • not eating meat or aversion to protein-rich foods

If your picky eater has any of these as well, consider a low dose zinc supplement as part of your picky eating strategic plan. Short term supplementation with a low dose of zinc (about 15mg) is generally quite safe if your child is otherwise healthy, though as always you’ll want to consult with your health team to make sure it’s appropriate.

Larger doses and extended supplementation can disrupt iron and copper levels so you don’t want to go overboard without getting tests done.



Nutrient #2: B vitamins

B12 and B1 (also called Cobalamin and Thiamin, respectively) are both involved in metabolism and nervous system function and, as such, can influence appetite and satiety.

The use of B vitamins to regulate appetite is somewhat controversial. Whereas older studies suggest there is a link, more recent studies have failed to isolate them as significant factors.

I have, however, seen significant improvements in children’s appetites when we supplement with B vitamins. I suspect this is because of their widespread effect on body function, particularly on nervous system and metabolism regulation.

As you increase metabolic rate you burn more energy and this can result in increased appetite. Interestingly, thiamin deficiency can cause both reduced appetite and increased appetite because of its effect on the satiety center of the brain.

Your child might be deficient in Bs if...

  • they are vegetarian or vegan,
  • they have had stomach infections like H Pylori,
  • they have celiac disease, Irritable Bowel Syndrome, Autism, pernicious anemia, folate deficiency or yeast overgrowth,
  • they have a high sugar diet,
  • they are under a great deal of stress
  • they have poor or sluggish pancreatic function (get this assessed by your naturopathic doctor)

Some common symptoms of B12 deficiency are:

  • slow growth,
  • numbness and tingling in arms and legs,
  • difficulty walking,
  • disorientation,
  • sore tongue,
  • constipation

Some signs of thiamine deficiency include:

  • Rapid weight loss
  • persistent diarrhea
  • fatigue
  • Irritability
  • apathy
  • depression

If your child’s picky eating includes any of these symptoms and you can not get enough B vitamins in them via whole foods like whole grains, beans, nuts, and meat, you can try a low dose supplement to see if it helps resolve their picky behavior.  

As with zinc, a short trial of B vitamins is quite safe though you don’t want to do it for too long without consulting your health care team. Excessive Bs can cause symptoms like irritability, nervousness, and anxiety so if you see that, stop the supplementation.



Nutrient #3: Vitamin C

If your picky eater is particularly avoiding meat or have any of the symptoms listed below, low stomach acid might be part of the picture. Vitamin C in the form of ascorbic acid can help maintain sufficient acidity in the stomach and help resolve the picky eating.

Other signs that stomach acid might be low are:

  • B12 deficiency,
  • belching,
  • very bad breath,
  • reflux,
  • stinky sweat,
  • feeling sleepy after meals.

As with the others listed here, supplementing with a bit of vitamin C is quite safe, as it is a water-soluble vitamin. If using a vitamin C supplement to improve stomach acid level choose an ascorbic acid that is not buffered as this buffering negates the acidifying effects in the stomach.



How To Know If Your Child Has Nutrient Deficiencies

Before asking your doctor for nutrient testing here are some self-assessment ideas to do at home. They are not diagnostic, but they can give you some hints on whether this is something to pursue. 

  • Take a look at your child's fingernails. Little white spots can indicate mineral deficiencies. If you see that your picky child has a lot of these, this nutritional support might be the fix you need.
  • Is your child exhausted? This is a common sign of B12 deficiency
  • Is your child a vegetarian or refusing meat? Zinc and B12 might be low. Assess if there are other sources of these nutrients in the diet.
  • Does your child avoid protein such as meat? She might have low stomach acid and therefore has a hard time digesting protein so it makes her feel uncomfortable - try extra vitamin C and zinc which help boost hydrochloric acid secretion. If she has low stomach acid she might also be low in iron and B12 which are prepared for digestion in the stomach.
  • Does your child’s immune system seem sluggish? He gets sick all the time and has a hard time getting over colds? He could need extra C and zinc
  • Has your child been diagnosed anemic? Look at iron, B12 and folic acid levels and also assess stomach acid
  • Was your child breastfed? If so, what was the mother’s mineral status while breastfeeding? If she was depleted, so was her breastmilk
  • Does your child suffer from constipation or diarrhea? Could indicate malabsorption and low B12



The Bottom Line

Picky eating can throw kids into a vicious cycle of nutrient deficiency. They don’t eat, they become nutrient deficient, their appetite is reduced, they become more deficient, so they are not hungry (or maybe they are but they just don't want to eat)... on and on it goes.

It can be extremely confusing and frustrating to you, it can be extremely frustrating and confusing to your child. There are likely to be tears all around! 

If these suggestions don’t help, you might need to explore whether one of the other factors mentioned at the top of this article is a big player in your case.

Your child’s picky behavior might be due to

  1. Nutrient deficiencies that interfere with hunger, appetite and satiety
  2. Poor digestive function that results in yeast overgrowth, cravings, food aversions
  3. Social factors like power struggles and anxiety

 Figuring out the root issue is the key to keeping your sanity intact.


==> Grab This Infographic To Get Started




Brown, K. & Wuehler, S., eds. 2000. Zinc and human health. Ottawa, Micronutrient Initiative.

Preventive effects of zinc sulfate on taste alterations in patients under irradiation for head and neck cancers: A randomized placebo-controlled trial, J Res Med Sci, 2013 

Double-blind, Placebo-controlled Trial of Zinc Picolinate for Taste Disorders, Acta Oto-Laryngologica2002

Neurobiology of Zinc-Influenced Eating Behavior , The American Society for Nutritional Sciences, 2000


About Jess Sherman, FDN-P, M.Ed, R.H.N

Jess is a Functional Diagnostic Nutrition® Practitioner, Registered Holistic Nutritionist and a trauma-sensitive Family Health Educator specializing in brain health & resilience for kids. She is also a teacher, with a Master's degree in education. Her Calm & Clear Kids introductory course, her Amino Acids (with kids!) Quickstart program, and her signature Resilience Roadmap,  along with her book Raising Resilience, have helped families in at least 44 countries improve the lives of their children with learning differences, anxiety, ADHD, and mood disorders and reduce their reliance on medication. She is the 2019 recipient of the CSNNAA award for Clinical Excellence for her work with families, and she continues to bring an understanding of the 5 Core Needs For Resilient Health to the mainstream conversation about children’s mental health, learning, and overall resilience through her blog, courses, workshops and as a contributor to print and online magazines. 

Let's Raise Resilient, Healthy Kids Together!

Join our mailing list to stay connected and receive the latest news & updates so you can raise healthy, resilient kids. Your information will never be shared.

By submitting this form you are consenting to receive email from Jess Sherman

The content on this website and in the guides and courses offered here is meant to provide information so that parents can make informed decisions and discuss these issue with their health care teams. It is not intended as, nor should it be considered a substitute for professional medical advice, diagnosis, treatment, or individualized care.