Anxiety disorders affect millions of people around the world and are among the most common mental health conditions today.
Many people experience anxiety from time to time, especially during stressful situations, but anxiety disorders are different.
They can cause constant fear, nervousness, racing thoughts, panic, sleep problems, and difficulty concentrating. In some cases, anxiety can become so severe that it affects work, relationships, and daily life.
Doctors and scientists have long studied the causes of anxiety disorders. Researchers know that genetics, life experiences, stress, and brain chemistry all play important roles.
Now, a new study from UC Davis Health has uncovered another possible piece of the puzzle: lower levels of an important nutrient called choline inside the brain.
The findings were published in the scientific journal Molecular Psychiatry, which is part of the Nature publishing group. The study gives researchers a closer look at how brain chemistry may be connected to anxiety disorders.
The research team reviewed data from 25 earlier studies that examined chemicals inside the brain. Altogether, the analysis included 370 people with anxiety disorders and 342 people without anxiety problems.
The scientists focused on substances called neurometabolites. These are chemicals involved in brain metabolism and normal brain function. One chemical stood out clearly during the study: choline.
The researchers found that people with anxiety disorders had about 8 percent lower levels of choline in their brains compared to people without anxiety. The difference was especially noticeable in the prefrontal cortex, a part of the brain involved in emotional control, thinking, decision making, and behavior.
Choline is an important nutrient that the body needs for many functions. It helps build healthy cell membranes and supports communication between nerve cells. Choline also plays a role in memory, mood, muscle control, and brain development.
Although the body can make a small amount of choline on its own, most of it must come from food. Common food sources include eggs, beef, chicken, fish, milk, and soybeans.
The researchers believe this finding could help explain some of the biological changes linked to anxiety disorders.
Anxiety is closely connected to the brain’s stress system. Two important brain regions are often involved. One is the amygdala, which helps the brain detect danger and process fear. The other is the prefrontal cortex, which helps people manage emotions and make rational decisions.
When these systems work normally, the brain can usually tell the difference between real danger and ordinary everyday stress. But in anxiety disorders, the system may become overactive. Small problems may feel overwhelming, and the body may stay in a constant “fight-or-flight” state.
The researchers think this constant stress response may increase the brain’s demand for choline. Over time, if the brain cannot get enough choline to meet its needs, levels inside the brain may fall.
The scientists used a special MRI-based technology called proton magnetic resonance spectroscopy, or 1H-MRS, to study brain chemistry. Unlike a normal MRI scan that mainly shows brain structure, this technique measures chemicals inside brain tissue without surgery or invasive procedures.
Researchers had previously noticed lower choline levels in people with panic disorder, but this larger analysis showed a more consistent pattern across several anxiety disorders.
These disorders included generalized anxiety disorder, panic disorder, social anxiety disorder, and different phobias.
The study also identified lower levels of another brain chemical called NAA in some brain regions. NAA is often linked to neuron health and brain function. However, the clearest and strongest finding remained the reduction in choline.
Even though the findings are interesting, the researchers caution that the study does not prove low choline directly causes anxiety. It also does not prove that taking choline supplements will cure or reduce anxiety symptoms.
The scientists say much more research is needed before doctors can recommend choline as a treatment.
Still, the study adds to growing evidence that nutrition and mental health may be more connected than people once believed. Scientists are increasingly studying how diet, vitamins, fatty acids, and nutrients may affect brain function and emotional health.
Researchers also noted that many people in the United States do not get the recommended daily amount of choline through their diets.
Some foods rich in omega-3 fatty acids, such as salmon, may be especially useful because they help deliver nutrients that support brain health.
The study findings are important because they provide one of the clearest signs yet of a measurable chemical difference in the brains of people with anxiety disorders. The consistency of the results across multiple studies makes the discovery especially interesting.
However, the research still leaves many unanswered questions. Scientists do not yet know whether low choline is a cause of anxiety, a result of anxiety, or simply one part of a much more complex process.
Future studies and clinical trials will be needed to understand whether improving choline levels could help reduce symptoms. For now, the research supports the idea that mental health is deeply connected to brain biology, nutrition, and overall physical health.
If you care about depression, please read studies that vegetarian diet may increase your depression risk, and Vitamin D could help reduce depression symptoms.
For more information about health, please see recent studies that ultra-processed foods may make you feel depressed, and these antioxidants could help reduce the risk of dementia.
Source: UC Davis Health.
