Celiac Disease: An Autoimmune Disorder Affecting the Intestines and Metabolism

In people with celiac disease, the immune system reacts inappropriately to gluten components. When gluten enters the small intestine, certain protein components trigger an inflammatory response. The so-called intestinal villi are particularly affected. These fine projections normally increase the surface area of the small intestine and enable the absorption of important nutrients.

Chronic inflammation causes these delicate structures to change progressively. The intestinal villi flatten or are partially destroyed. As a result, the surface area of the small intestine shrinks significantly, and nutrients are absorbed less efficiently.

Grains that contain gluten include, among others:

• Wheat
• Rye
• Barley
• Spelt

Modern research also shows that genetic factors play an important role. Certain changes in the immune system increase the likelihood of developing celiac disease. In addition, scientists are debating whether environmental factors, infections, or changes in the gut microbiota can influence the course of the disease. The intestinal barrier itself is also increasingly becoming the focus of research. Changes in the intestinal mucosa could further exacerbate inflammatory reactions. 

Symptoms vary considerably from person to person. Some patients develop noticeable symptoms as early as childhood, while others remain virtually symptom-free for a long time.

Typical symptoms include, among others:

• Diarrhea
• Bloating
• Abdominal pain
• Weight loss
• Fatigue
• Iron deficiency

Those affected often complain of chronic fatigue. Due to impaired nutrient absorption, the body frequently lacks iron, vitamins, or trace elements. Problems with concentration, headaches, or neurological symptoms may also occur. Some patients additionally develop depressive moods or sleep problems. In children, celiac disease often affects growth and physical development. Stunted growth, being underweight, or noticeable fatigue are among the possible signs. Adults, on the other hand, more frequently develop nonspecific symptoms that cannot be clearly attributed to a specific cause for a long time. In addition, some patients experience symptoms outside the intestines.

These include, for example:

• Skin changes
• Joint pain
• Osteoporosis
• Neurological symptoms
• Hormonal changes

Modern medicine therefore increasingly views celiac disease as a systemic autoimmune disorder that affects numerous organ systems.

If the disease remains untreated for an extended period, chronic inflammation of the small intestine can have significant consequences. Long-term nutrient deficiencies are particularly problematic. Impaired absorption of vitamins, minerals, and trace elements leads to various symptoms and secondary conditions.

Possible consequences include, among others:

• Iron-deficiency anemia
• Osteoporosis
• Weight loss
• Chronic fatigue
• Nerve damage
• Fertility problems

The immune system also remains constantly activated. Modern research is therefore intensively investigating how chronic inflammatory processes might influence other diseases. In addition, untreated celiac disease increases the risk of other autoimmune diseases. These include, for example, certain thyroid disorders or type 1 diabetes mellitus. This is precisely why early diagnosis plays such an important role. 

Diagnosis is based on blood tests, antibody tests, and examinations of the small intestine. Gastroenterology provides specialized support in this process.

Important diagnostic methods include, among others:

• Antibody tests
• Small intestine biopsies
• Blood tests
• Screening for nutritional deficiencies

It is particularly important not to eliminate gluten-containing foods on your own before diagnosis, as this can skew test results. The most important treatment is a long-term gluten-free diet. This can often lead to a significant reduction in intestinal inflammation.

Key components of the treatment are:

• a gluten-free diet
• Nutritional counseling
• Monitoring for nutrient deficiencies
• Regular follow-up visits

A particularly strict diet plays a central role, as even small amounts of gluten can trigger inflammatory reactions again. Modern nutritional medicine is increasingly helping those affected to maintain a balanced diet despite dietary restrictions. In addition, research into new therapeutic approaches is becoming increasingly important. Scientists are currently investigating, among other things, ways to more specifically influence immune responses or stabilize the intestinal barrier. 

Celiac disease is one of the most significant chronic autoimmune diseases of the digestive system and simultaneously affects the gut, metabolism, and nutrient absorption. Modern research is increasingly demonstrating how closely the immune system, gut microbiota, and chronic inflammatory processes are interconnected. This is precisely why early diagnosis, consistent dietary therapy, and long-term care play a vital role in health and quality of life. Older patients are also affected by celiac disease—in the context of geriatrics and geriatric medicine, special attention should be paid to the increased risk of osteoporosis in older adults.