Doctors often focus on fighting infections directly with medicines such as antibiotics and antiviral drugs.
While these treatments are essential, researchers are beginning to learn that another important question may be equally important: how can the body better protect itself during disease?
A fascinating new study suggests that the answer may partly lie in nutrition. Scientists at the Salk Institute have discovered that a naturally occurring amino acid called methionine helped infected mice survive severe inflammation by improving the ability of their kidneys to remove harmful substances from the blood.
The findings were published in Cell Metabolism and offer a fresh perspective on how nutrition may influence disease outcomes.
Every year, millions of people worldwide experience serious infections, sepsis, injuries, and inflammatory illnesses. Yet patients often respond very differently to similar health problems. Some recover rapidly, while others develop life-threatening complications. Researchers refer to these different outcomes as disease trajectories.
For years, scientists have searched for ways to shift people away from the path leading to severe illness and toward recovery. Dr. Janelle Ayres and her colleagues at the Salk Institute are among the researchers leading this effort.
One of the greatest challenges during serious illness is controlling inflammation. Inflammation acts as the body’s alarm system. It helps recruit immune cells and coordinate defenses against invading germs. Without inflammation, the immune system would struggle to protect the body.
The problem is that inflammation can become excessive. When this happens, the same protective processes that fight disease can start damaging healthy tissues. Excessive inflammation contributes to many serious medical conditions, including sepsis, organ failure, and complications from infections.
The Salk researchers wanted to understand how the body naturally keeps inflammation under control. They studied mice infected with a bacterium called Yersinia pseudotuberculosis. During the infection, the animals showed signs of major metabolic changes, including reduced food intake and lower levels of certain nutrients in their blood.
One nutrient stood out. The infected mice had unusually low levels of methionine. Methionine is an amino acid found in many protein-rich foods and is required for numerous biological processes. Because the body cannot produce it, it must come from the diet.
The scientists decided to test whether restoring methionine could influence the course of disease. They added extra methionine to the diets of infected mice and carefully monitored what happened.
The results were remarkable. The supplemented mice experienced fewer complications and were significantly more likely to survive. They were protected against severe weight loss, damage to the blood-brain barrier, and death caused by excessive inflammation.
Further experiments revealed an unexpected explanation. The protective effect did not primarily depend on changing immune cell activity. Instead, methionine improved kidney performance.
The kidneys continuously filter blood, removing waste products and maintaining fluid balance. The researchers found that methionine increased blood flow through the kidneys and enhanced their filtering ability. This allowed the animals to remove excess inflammatory cytokines through urine.
Cytokines are proteins that help coordinate immune responses. While they are necessary for fighting infection, high levels can become dangerous. By helping the kidneys eliminate excess cytokines, methionine reduced harmful inflammation while preserving the body’s ability to attack the infection.
The team also examined whether the same mechanism worked in other disease models. In mice with sepsis and kidney injury, methionine again produced beneficial effects. This suggests that the nutrient may influence inflammatory diseases more broadly rather than affecting only one specific infection.
The findings highlight a growing area of medical research that focuses on supporting the body’s natural protective mechanisms. Instead of targeting pathogens alone, scientists are increasingly interested in helping the body tolerate illness and recover more effectively.
One of the greatest strengths of this study is that it identified a specific biological mechanism connecting diet, kidney function, and inflammation. The findings were consistent across multiple disease models, which strengthens confidence in the results.
However, the research remains at an early stage because all experiments were conducted in mice. Human metabolism and disease responses are more complex, and it remains unknown whether methionine supplementation would provide similar benefits in patients.
The study should therefore be viewed as an important scientific discovery rather than a clinical recommendation. Future human studies will be crucial for determining whether methionine or similar nutritional approaches can become part of medical care for inflammatory diseases.
If you care about inflammation, please read studies about turmeric: nature’s golden answer to inflammation, and what to eat to reduce chronic Inflammation.
For more health information, please see recent studies about how a plant-based diet could help ease inflammation ,and Vitamin D deficiency linked to increased inflammation.
Source: Salk Institute.
