01/15/2026
A recent study shows that blood from people with ME/CFS and Long COVID can directly damage healthy human muscle tissue. When healthy muscle was exposed topatient blood, it became weaker, showed signs of energy stress in the mitochondria, and began to break down over time.
Researchers used bioengineered muscle to study the effects of blood alone, without factors like inactivity or deconditioning. Muscle problems appeared within 48 hours and became worse with longer exposure. This suggests the damage happens in stages, starting with short-term stress and leading to weakness and breakdown.
These findings challenge the idea that symptoms are caused by deconditioning and instead point to harmful factors in the blood. The study also introduces a new lab model that closely matches patient symptoms and could speed up research on tests and treatments.
👉 Read the full study: https://doi.org/10.1088/1758-5090/adf66c