Vitamin deficiency in everyday life: Why a balanced supply is so important

What does vitamin deficiency actually mean?

In short: your body is a pro at consuming vitamins, but a real slacker when it comes to producing them itself. Except for vitamin D, which your skin produces itself with the help of sunlight, you have to get other vitamins from food [1]. If this supply is lacking for a long time, your reserves will be depleted and a vitamin deficiency will develop. Medicine distinguishes between hypovitaminosis (you are undersupplied) and avitaminosis, in which a vitamin is completely lacking [2].

The tricky thing is that a deficiency doesn't happen overnight. It creeps into your everyday life over weeks or months. It usually starts quite unspectacularly with fatigue, a decline in performance, or the fact that you suddenly catch every infection going around. Since these signs are so wonderfully vague, very few people immediately think of an empty nutrient account, even though this is often the reason for the slump [3].

Why do vitamin deficiencies occur so often in everyday life?

Between appointments, to-do lists, and quick meals, balanced variety on your plate sometimes falls by the wayside. The main reason for depleted reserves is a permanently unbalanced diet [3]. If heavily processed foods or the umpteenth crash diet dominate your diet, vitamins often fall by the wayside. Even with a purely plant-based diet, you should keep your planning under control: vitamin B12, for example, is a real fan of animal foods and tends to be scarce in vegans without a targeted intake [3].

But your diet isn't the only factor. Chronic stress literally eats away at your micronutrients, while alcohol, smoking, and certain medications can seriously hinder your body's ability to absorb nutrients [3]. And then there are times when your system suddenly demands “extra fuel”: During growth, pregnancy, breastfeeding, or in old age, your needs increase significantly [3]. Even if your gastrointestinal tract is not functioning properly, for example due to Crohn's disease or celiac disease, the valuable substances often do not even reach where they are needed [3].

How can you tell that your body is lacking something?

The problem with vitamin deficiency is that it rarely comes with obvious warning signs. Much more often, it manifests itself in general complaints that are easily attributed to other causes in stressful everyday life.

Typical signs to keep an eye on:

Persistent fatigue: You feel exhausted even though you are getting enough rest.

Poor concentration: Your focus wanes and your mind wanders more quickly.

Increased susceptibility to infections: You seem to catch every cold that comes along.

Changes to your skin and hair: Your skin looks pale, your nails become brittle, or your hair loses its strength.

Physical signs: Muscle and joint pain or cracked corners of the mouth can also be early indicators.

Since many vitamins are directly involved in energy production and your immune system, deficiencies often first manifest themselves in your general performance [3]. The exact symptoms that occur depend, of course, on which vitamin is lacking and how long your reserves have been depleted.

An overview of the most important vitamins

Depending on which vitamin is currently in short supply, your body sends different signals. Here is a brief guide to the world of essential micronutrients:

Vitamin D – The sun worshipper

Vitamin D is the boss of bone metabolism and supports the normal function of your muscles [1]. Since your body needs plenty of sunlight on the skin to produce it itself, low levels are almost a classic in winter [1]. If the depot remains empty for a long time, muscle weakness or bone pain can result [1].

Vitamin B12 – The nerve specialist

This vitamin is essential for blood formation and a strong nervous system [4]. Since it is found almost exclusively in animal-based foods, fans of plant-based cuisine in particular should pay close attention to their intake. A deficiency often manifests itself in fatigue and paleness, but can also be accompanied by neurological symptoms such as sensory disturbances [4].

Vitamin B6 – The all-rounder

B6 is involved in countless metabolic processes [5]. It also plays a role in your mood [6]. Although a deficiency is rather rare, it can manifest itself in skin changes, inflamed corners of the mouth, or an annoying tingling sensation [6].

Vitamin B1 (thiamine) – The energy igniter

Organs with a real appetite for energy, such as your brain and heart, particularly love vitamin B1 [7]. If the supply is interrupted, your body often reacts with fatigue, irritability, or concentration problems [7]. Fortunately, severe deficiency is rare in our part of the world and usually only occurs in cases of extreme malnutrition or heavy alcohol abuse [7].

Folic acid (vitamin B9) – The cell architect

Folic acid is your partner in cell division and blood formation [8]. A deficiency can make you look pale and tired. It is particularly important during pregnancy: a good supply is the basis for the healthy development of your child [8].

Vitamin C – The protective shield

Vitamin C not only boosts your immune system, but also supports your skin and connective tissue [9]. If you don't get enough of it, this often manifests itself in bleeding gums, slow wound healing, or exhaustion [9].

How is a vitamin deficiency diagnosed?

If you feel like your inner battery is empty, the first step is ideally to go straight to the doctor's office. Instead of fishing in the dark, a blood test can shed some light on the situation: it checks whether your levels are within the reference range. It is particularly worth taking a look at the “usual suspects” such as vitamin D, B12, or folic acid, as deficiencies in these are relatively common [10, 11].

Important for you: Not every value that is at the lower end of the normal range means immediate red alert. Interpretation is a matter of precision and depends on your overall picture, i.e., your diet, your symptoms, and your medical history. Therefore, it is not recommended to take high doses on your own. This is especially true for fat-soluble vitamins (A, D, E, and K): more is not always better. Since your body stores these vitamins, an overdose is possible, which you should avoid [10].

What can you do to ensure a stable supply of vitamins?

The good news is that in most cases, you can optimize your intake by making small, consistent changes to your daily routine. A varied diet is the foundation for this [3]. The more colorful your plate is, the more likely you are to be getting the full spectrum of vitamins.

A few simple guidelines will boost your nutrient reserves:

• Focus on variety: Fruit, vegetables, whole grains, nuts, and legumes are real powerhouses. Depending on your diet, high-quality animal products also provide important micronutrients.
• Gentle preparation: Some vitamins, such as vitamin C or the B group, are very sensitive to heat. To prevent them from disappearing into the cooking water, brief steaming is often the better choice.
• Combine cleverly: The fat-soluble vitamins A, D, E, and K need a little “fat boost” to be absorbed optimally. A dash of high-quality oil on your salad can make a difference.
• Get some daylight: Regular time in the fresh air is crucial for your body's own vitamin D production.

During certain stages of life, or if your diet is lacking despite your best efforts, targeted nutritional supplements can be a useful aid, ideally after consulting your doctor. Such products are not a substitute for a balanced diet, but serve as a supplement when your needs are temporarily higher.

Curious? You can find more interesting articles on the topic of vitamins in our magazine:

• Everything you need to know about niacin: functions, sources, and effects of the vitamin
• What are B vitamins – and why do we need them?
• Often in short supply in winter – vitamin D
• Everything you need to know about vitamin A
• Pollen season and children's breathing: How omega-3 and vitamin E strengthen the respiratory tract in children

FAQ – Frequently asked questions

Is it possible to have multiple vitamin deficiencies at the same time?

Absolutely. Especially if your diet is very unbalanced or your gastrointestinal tract cannot optimally utilize nutrients, several vitamins can simultaneously become depleted [3].

When are dietary supplements really useful?

Not automatically, but in specific cases. They can be useful if a deficiency has been diagnosed by a doctor or if your requirements increase during certain phases of life, such as pregnancy, breastfeeding, or if you follow a vegan diet. It is important not to experiment with high doses on your own, but to seek an individual assessment from your doctor.

Can my lab results be normal even though I feel like I have a deficiency?

That is possible. Reference ranges provide statistical norm values, but they do not say anything about how you feel individually with a certain value. That is why the overall picture of symptoms, nutrition, and life situation always counts.

Does the way food is stored play a role in its vitamin content?

Sensitive vitamins can be partially lost due to light, heat, and long storage times. Freshness and gentle preparation do make a difference here.