Signs of Zinc Deficiency | Warning Signs & What to Do

In a recent article I wrote extensively about the benefits of Zinc. This basic mineral is a basic building block of our bodies, that helps us synthesize protein, produce testosterone, and even unlocks our DNA.

Which got one reader a bit worried about Zinc deficiency. After all, it stands to reason that if Zinc provides all those benefits, then there are probably stark consequences if we don’t get enough. And that’s absolutely true. First we’ll look at some short-term signs you may be Zinc deficient, then look at what the long-term effects might be. Then we’ll explore which people might be most at-risk, and what we can all do to stay safe.

What You Need to Know:

  • Daily recommended intake of Zinc is around 9 mg; the best sources are meats, nuts & seeds, and supplements.
  • Signs of deficiency range from hair loss to lingering colds, and can even lead to Diabetes risks and infertility.
  • Vulnerable populations include anyone consuming limited meat and pregnant women.
  • Certain common medications can also cause the body to not absorb Zinc.

Most Common Signs of Zinc Deficiency

It’s important to know what the symptoms are of malnutrition, but many signs can point to multiple issues. So we not only need to know what it looks like if you’re low on Zinc, but we need to look at why this is occurring, that way you don’t accidentally overcompensate with too much Zinc and miss the root cause of the symptom.

Here’s the list of symptoms, and below that we’ll look into the mechanisms of what’s going on.

  • Hair Loss
  • Diarrhea
  • Infections
  • Long Colds
  • Wounds Not Healing
  • Loss of Appetite
  • Impotence
  • Mouth sores/ulceration
  • Loss of smell/taste
  • Cognition
  • Depression

Hair Loss

Because Zinc is required for the action of over 300 enzymes, many of our basic nutrients aren’t absorbed without it. Because of this and its ability to help us metabolize proteins, Zinc is necessary for hair growth. So necessary, even, that one study on alopecia (hair loss), concluded that “Zinc supplementation needs to be given” to people with hair loss.


Again, this comes down to digestion. Without Zinc, our entire GI (gastrointestinal) tract is thrown out of order. And Zinc-caused diarrhea is a feedback loop–the more we have diarrhea, the lower our Zinc, the more diarrhea we suffer from. In one study, this unseemly affliction was reduced by 39% with Zinc supplementation.

Infections and Wounds

In my previous article we discussed how Zinc is the most important mineral for our Immune System. Because it’s heavily involved in making and using proteins, our bodies cannot heal without it. And while we’re not healing, we’re more at risk of infection, infections which we can’t fight without Zinc.

Long Colds

Since we’re on the subject of the Immune System, we should point out that if your cold or seasonal flu is lasting longer than normal, it may be due to Zinc deficiency. And adding a Zinc supplement could shorten your cold.

Loss of Appetite

Zinc plays a pivotal role in how our body uses and processes Ghrelin, the hunger hormone. In one study, researchers found that children with low Zinc levels also had impaired Ghrelin response. In a laboratory trial, Japanese researchers discovered that withholding Zinc from animals suppressed their appetite.

Loss of Testosterone

As we discussed in our Zinc-Testosterone article, this mineral is essential to male health and performance. A study of 720 men showed a direct relationship between Zinc and Testosterone levels. Not something to be taken lightly.

Mouth Sores

Because of its effects on our Immune System, lacking Zinc can lead to a recurrence of some otherwise minor irritations. For instance, 28% of people with recurring mouth sores had Zinc deficiencies, making this a telltale sign you might need more Zinc in your diet if this happens to you.

Loss of Smell and Taste

Though this mechanism isn’t fully clear, one link came up during recent “long-COVID” research. Medical professionals found that among people suffering from loss of smell and/or taste, many also had Zinc deficiencies. It may be related to the body fighting an infection for so long that it burns through its mineral reserves, something we’ll talk about a bit further down.


Because Zinc is involved in the cellular transfer of nutrients, and for the transportation of proteins, especially in the brain, without Zinc we can suffer severe cognitive failure, including loss of memory.


Again, modern science is still exploring the link, but Zinc has been correlated so strongly to depression and anxiety that one research paper supports using it as an adjunct treatment for some symptoms.

Long-Term Consequences

We won’t spend as long on each of these symptoms, as many of them take years to develop and the mechanisms are a direct result of the above symptoms. For instance, lack of protein synthesis over time will of course mean a person doesn’t grow as tall as they could have and later-in-life bone fragility. And depleted Zinc destroys the immune system, leading to long-term infections.

We list these as warning signs. If you’re worried you may have suffered or do suffer from these as a result of Zinc deficiency, seek medical attention as necessary.

  • Growth failure
  • Hypogonadism
  • Recurrent infections
  • Diabetes
  • Bone fragility
  • Schizophrenia
  • Infertility

People Vulnerable to Zinc Deficiency

The two main reasons someone could be vulnerable to a Zinc deficiency are

a) Diet.

b) Ongoing medical condition.

c) They have a genetic condition.


Vegetarians and Vegans are the people most at risk of inadequate Zinc because the most common foods that have proper Zinc are animal proteins. The next at risk people are those who drink excessive alcohol, or who have high Copper, Calcium, or Phosphates in their diets. All of those things prevent our bodies from absorbing Zinc, no matter how much we consume.

Ongoing Conditions

There are three ongoing conditions that can impair your body’s ability to maintain Zinc levels. The first is having a child. Both pregnancy and breastfeeding strip the mother’s body of several nutrients, including Zinc. The second condition is any traumatic, wide-spread wounding or burning. Not only is your body trying to fight infections all over the open wound areas, but the toll of rebuilding skin and muscle tissue depletes the rest of your body of its Zinc stores.

Lastly, Diabetes takes an incredible toll on our Pancreas. And as I wrote in the Benefits of Zinc article, the Pancreas uses a ton of Zinc. Because of this, diabetic people should always monitor their Zinc levels.

Genetic Conditions

There are four conditions that people are typically born with, or that express themselves for genetic reasons later in life, though lifestyle choices can cause them. They are:

  • Pancreatitis
  • Liver Disease
  • Sickle Cell
  • Crohn’s

If you have any of these conditions, or suspect you might, they can and will cause sever Zinc deficiencies, and you should speak with your doctor about clinical levels of supplementation.

One Last Thing

An outlier that probably doesn’t affect too many people is the use of a common diuretic, hydrochlorothiazide. One study found that taking it robbed men’s bodies of so much Zinc it caused sexual dysfunction. Only men in the study who took 500 mg of Zinc recovered their sexual function.

Where to Get More Zinc

Now the scary stuff is over. Here’s the part where we discuss how to avoid Zinc Deficiencies. Not only should you be aware of the diet and medical conditions listed above, but you should also take active steps to keep you Zinc levels up. The following are the food sources with the highest Zinc concentrations.

  • Red meat
  • Poultry
  • Wheat germ
  • Wild rice
  • Seeds and Nuts

And don’t forget that quality supplementation can make a huge difference. Especially if you have chosen a Vegetarian or Vegan diet.

Final Word

Zinc, as we’ve seen, is not only incredibly beneficial as a supplement, and paramount for Testosterone health, but lacking the right amount of Zinc can have devastating consequences. In short, Zinc isn’t a luxury nutrient–it’s necessary for our health and wellbeing. So add it to your diet or supplement routine, and enjoy the peace of mind that comes from knowing you’re giving your body what it needs, so it can give you what you want.

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About the Author

Sam is a passionate health and fitness enthusiast who has been interested in supplements, fitness, and wellness for over 10 years. He is the founder of Great Green Wall - the health and wellness brand and has completed multiple fitness certificates, including personal training and nutrition certifications. Sam has been working as a personal trainer for the past three years and is dedicated to helping his clients achieve their fitness goals and lead healthier lifestyles. He believes that a healthy lifestyle is crucial to a happy and fulfilling life and is committed to sharing his knowledge and passion with others.

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