An 8 percent reduction might not sound dramatic, but in the brain, it is significant.
En los laboratorios de UC Davis, investigadores han encontrado una huella química recurrente en los cerebros de quienes padecen trastornos de ansiedad: niveles de colina aproximadamente un 8% más bajos que en personas sin estos diagnósticos, con la deficiencia más marcada en la corteza prefrontal, región que gobierna el pensamiento, la emoción y la toma de decisiones. Este hallazgo, surgido del análisis de 25 estudios y más de 700 participantes, no ofrece una cura, pero sí un punto de partida medible en la antigua búsqueda humana por comprender por qué la mente a veces se vuelve enemiga de sí misma. La ciencia avanza con cautela: saber que algo falta no es lo mismo que saber cómo restaurarlo, pero nombrar lo invisible es siempre el primer paso.
- Los trastornos de ansiedad afectan a cerca del 30% de los adultos en Estados Unidos, y muchos no reciben tratamiento adecuado, lo que convierte cada nuevo hallazgo en una urgencia clínica y humana.
- Por primera vez, un metaanálisis documenta de forma consistente una deficiencia química específica —la colina— en los cerebros de personas con ansiedad, lo que sacude los paradigmas centrados exclusivamente en neurotransmisores como la serotonina.
- El estrés crónico propio de los trastornos de ansiedad podría aumentar la demanda cerebral de colina, generando un ciclo en el que la enfermedad misma agota el recurso que el cerebro necesita para regularse.
- Los investigadores advierten contra la automedicación con suplementos y señalan que aún se desconoce si aumentar la ingesta de colina reduce los síntomas, pues se requieren ensayos clínicos controlados para probarlo.
- El hallazgo abre una vía concreta de investigación y sugiere que la nutrición —con alimentos como huevos, salmón e hígado— podría ser una pieza del rompecabezas, aunque no un sustituto de la atención profesional en salud mental.
Investigadores de UC Davis Health han identificado un patrón químico consistente en los cerebros de personas con trastornos de ansiedad: niveles de colina aproximadamente un 8% más bajos que en individuos sin estos diagnósticos. El hallazgo proviene de un metaanálisis de 25 estudios que comparó a 370 personas con trastornos de ansiedad frente a 342 controles. La deficiencia fue más pronunciada en la corteza prefrontal, la región cerebral encargada de regular el pensamiento, las emociones y la toma de decisiones.
La colina cumple funciones esenciales: contribuye a formar las membranas celulares y sostiene procesos vinculados a la memoria, el estado de ánimo y el control muscular. Aunque el cuerpo produce pequeñas cantidades, la mayor parte debe obtenerse a través de la alimentación. Los investigadores proponen que el estado de alerta elevado propio de la ansiedad podría aumentar la demanda cerebral de este nutriente, provocando su descenso cuando la ingesta no alcanza a cubrir esa exigencia.
Jason Smucny y Richard Maddock, coautores del estudio, llevan años estudiando la química cerebral mediante espectroscopía de resonancia magnética de protones, una técnica que mide niveles de sustancias químicas en el tejido cerebral sin procedimientos invasivos. Maddock había observado previamente niveles bajos de colina en personas con trastorno de pánico; ese antecedente impulsó el metaanálisis más amplio. Aunque esperaban encontrar una reducción, la consistencia del resultado los sorprendió.
Los investigadores subrayan la necesidad de cautela. No está demostrado que aumentar la ingesta de colina reduzca la ansiedad, y la automedicación con suplementos no está recomendada. Sin embargo, el hallazgo refuerza el vínculo entre nutrición y salud mental, y señala alimentos ricos en colina —huevos, hígado, salmón, pollo— como parte de una dieta que cuida el cerebro. La pregunta sobre si restaurar los niveles de colina puede aliviar los síntomas permanece abierta, pero ahora está anclada en biología medible y en una dirección concreta para la investigación futura.
Researchers at UC Davis Health have identified a consistent chemical signature in the brains of people with anxiety disorders: significantly lower levels of choline, a nutrient essential for brain function. The finding emerged from a meta-analysis of 25 previous studies that measured neurometabolites—the chemical substances involved in how the brain metabolizes energy and maintains itself. Across those studies, 370 people diagnosed with anxiety disorders were compared to 342 people without such diagnoses. The pattern was unmistakable. Those with anxiety showed choline levels roughly 8 percent lower than the control group, with the deficit most pronounced in the prefrontal cortex, the brain region responsible for regulating thought, emotion, decision-making, and behavior.
This is the first meta-analysis to document such a consistent chemical pattern across anxiety disorders, according to Jason Smucny, a coauthor and assistant professor in UC Davis's Department of Psychiatry and Behavioral Sciences. The discovery suggests that nutritional approaches—specifically adequate choline supplementation—might help restore the brain's chemical balance and improve outcomes for patients. Choline performs several critical roles in the body. It helps form the membranes that wrap around cells and supports brain functions tied to memory, mood regulation, and muscle control. While the body can manufacture a small amount on its own, most choline must come from food.
Anxiety disorders rank among the most common mental health conditions in the United States, affecting roughly 30 percent of adults. Richard Maddock, the study's lead author and a psychiatrist and research professor at UC Davis, has spent decades treating people with these conditions and studying how they reshape the brain. The disorders themselves take many forms—generalized anxiety disorder, panic disorder, social anxiety disorder, specific phobias—but they share a common thread: they distort how the brain processes stress, danger, and uncertainty. Two brain regions typically play central roles. The amygdala helps determine whether something feels safe or threatening. The prefrontal cortex supports planning, decision-making, and emotional control. When this system works properly, the brain can distinguish between manageable problems and genuine threats. In anxiety disorders, that balance breaks down. Ordinary worries can feel overwhelming, and the body's stress response becomes difficult to quiet.
Neurotransmitters add another layer to the chemistry. Anxiety disorders have been linked to changes in norepinephrine, a chemical messenger involved in the body's fight-or-flight response. Researchers at UC Davis propose that this elevated arousal may increase the brain's demand for choline. If the brain cannot absorb enough choline to meet that heightened demand, levels drop. Maddock and Smucny have long studied the connection between brain chemistry and mental illness using a technique called proton magnetic resonance spectroscopy, or 1H-MRS. Unlike standard brain imaging, which produces pictures of brain structure, this method uses magnetic fields and radio waves to measure chemical levels in brain tissue without surgery or invasion. Maddock had previously observed low choline in studies of people with panic disorder. That earlier work led to the broader meta-analysis with Smucny. Although the researchers anticipated finding reduced choline, the consistency of the result was striking. An 8 percent reduction might not sound dramatic, but in the brain, it is significant.
The study also found reduced levels of NAA, a compound often considered a marker of neuronal health and function, in various brain regions. But the clearest and most consistent signal was the reduction in choline-containing compounds in anxiety disorders. The question now is what to do with this knowledge. Maddock emphasized caution. It remains unknown whether increasing dietary choline will actually reduce anxiety. Self-medicating with excessive choline supplements is not advisable. Yet the finding adds weight to a growing body of evidence linking nutrition and mental health. Choline is already known to be vital for the brain and nervous system, and most people in the United States—including children—do not consume the recommended daily amount. For someone with an anxiety disorder, reviewing diet to ensure adequate choline intake may be worthwhile. Salmon and other sources of omega-3 fatty acids are particularly good sources of choline for the brain. Other rich sources include beef liver, eggs (especially the yolk), beef, chicken, fish, soy, and milk.
Dietary studies in adults have suggested that higher choline intake might be linked to lower rates of depression, though the same research found no significant association with anxiety or psychological distress. This makes the UC Davis brain imaging finding especially intriguing. It points to a measurable chemical difference inside the brain but does not prove that low dietary choline causes anxiety or that raising choline will relieve symptoms. Controlled trials would be needed to test whether changing choline intake can alter brain chemistry or improve anxiety outcomes. For now, the findings support a practical but cautious message: nutrition may be one piece of the anxiety puzzle, but it is not a substitute for professional mental health care. The discovery provides scientists with a clearer chemical target to investigate and gives people another reason to pay attention to the nutrients that support brain health. The answer to whether choline supplementation can help restore brain chemistry in people with anxiety disorders remains open—but the question is now grounded in measurable biology.
Notable Quotes
This is the first meta-analysis that shows a chemical pattern in the brain in anxiety disorders. Nutritional approaches, like proper choline supplementation, could help restore brain chemistry and improve outcomes for patients.— Jason Smucny, coauthor and assistant professor, UC Davis Department of Psychiatry and Behavioral Sciences
We don't yet know if increasing choline in the diet will help reduce anxiety. More research is needed. People with anxiety should not self-medicate with excessive choline supplements.— Richard Maddock, lead author and psychiatrist, UC Davis
The Hearth Conversation Another angle on the story
So the study found lower choline in anxious brains. But does that mean choline deficiency causes anxiety, or is it a symptom of anxiety?
That's the crucial question nobody can answer yet. The brain imaging shows the chemical difference is real and consistent. But whether low choline is the root cause, a consequence of chronic stress, or simply a marker of something else—that's still unknown.
And they're not recommending people rush out and buy choline supplements?
Exactly. Maddock was explicit about that. We don't know if raising choline will actually reduce anxiety. That would require controlled trials. Right now, self-supplementing could be premature or even risky.
What about just eating more choline-rich foods? That seems safer than supplements.
It does seem safer, and Maddock suggested people with anxiety might review whether they're getting the recommended daily amount. Most Americans aren't. But even that's not proven to help anxiety specifically. It's a reasonable step, not a cure.
Why is the prefrontal cortex the key region here?
Because that's where the brain regulates emotion, makes decisions, and controls impulses. If choline is depleted there, the brain loses some of its ability to calm itself down and think clearly through worry. It's the region that should be telling the amygdala, 'This is manageable,' but it may not have the chemical resources to do that effectively.
So chronic stress might be burning through choline faster than the body can replace it?
That's the theory. The fight-or-flight response demands a lot of neurochemical resources. If that state becomes chronic, the brain's choline reserves may get depleted. But again, that's still hypothesis. The imaging shows the deficit; it doesn't prove the mechanism.