People with myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) often describe a similar sensation. They feel as though they are constantly sick with the flu that just won’t go away. Their daily lives are characterized by exhaustion, feeling overwhelmed after the slightest exertion, and the sense of never truly “recovering.”
A recent scientific study now provides new insights into why this condition might feel this way.
The study, titled "Heightened innate immunity may trigger chronic inflammation, fatigue and post-exertional malaise in ME/CFS" and published in npj Metabolic Health and Disease, examined the blood and immune systems of people with ME/CFS and compared them to those of healthy individuals. The researchers analyzed metabolism and proteins in the blood and tested immune responses before and after physical exertion.
Complex pattern
The results do not point to a single problem, but rather to a consistent pattern of multiple biological changes. Evidence of disturbances in energy metabolism, the immune system, and various signaling pathways in the body was found in ME/CFS. Notably, many of these changes intensified following physical exertion, which is precisely when those affected typically experience a worsening of their symptoms.
A key finding concerns the innate immune system. This system is the body’s rapid first line of defense against infections. Typically, it responds briefly and then calms down once the danger has passed.
However, the study shows that this system can react hypersensitively in ME/CFS patients. When exposed to immunological stimuli, such as an infection, the cells produce significantly stronger inflammatory mediators than those of healthy individuals. This suggests altered regulation of the immune response.
At the same time, the researchers found evidence of other biological abnormalities in cellular energy production, fat metabolism, antioxidant defense, and signaling pathways, such as tryptophan metabolism. Tryptophan metabolism is important for producing serotonin and for immune responses.
These changes do not occur in isolation, but rather appear to be interconnected.
Of particular relevance to those affected, many of these abnormalities become more pronounced following physical or mental exertion. This aligns with post-exertional malaise (PEM), which is the typical deterioration that occurs after exertion, often with a delay.
When multiple systems, such as energy production and immune regulation, are out of balance at the same time, even a minor stressor can trigger an “overreaction” in the body.
Thus, the study reveals not only individual biological changes, but also the complex interplay of metabolic and immune dysfunctions that could explain ME/CFS symptoms.
Future perspectives
Meanwhile, researchers are discussing potential avenues for future therapies. These include interventions that could target specific biological dysfunctions, such as inflammatory processes, metabolic pathways, and the gut-immune axis. Initial evidence suggests that these findings could, in the long term, help develop biomedical treatment approaches for ME/CFS and other post-infectious conditions.
For many affected individuals, this is precisely what matters. ME/CFS is not just "unexplained fatigue," but rather a disease with measurable biological changes.
Ultimately, the conclusion remains:
The body reacts, albeit within a complex, shifted equilibrium. This interplay could be the key to understanding ME/CFS.
