Nutraceutical Interception of Cachexia: Grape-Derived Compounds as Pathophysiological Network Modulators.

Cancer cachexia is a multifactorial syndrome characterized by metabolic dysregulation, inflammation, and progressive loss of skeletal muscle mass. Frequently observed in colorectal cancer patients, it is associated with poor clinical outcomes and reduced treatment tolerance. Current therapies provide limited benefit, underscoring the need for integrative approaches. Grape seed polyphenols, particularly oligomeric proanthocyanidins, have demonstrated potential to modulate catabolic signaling, mitochondrial dysfunction, and inflammatory responses involved in cachexia pathophysiology. This review integrates preclinical and clinical evidence on the use of grape seed-derived products, highlighting their effects on NF-κB and AMPK pathways, redox homeostasis, and gut-muscle axis. Furthermore, the nutritional composition and bioactive properties of grape seed flour-rich in fiber and phenolic compounds-are discussed in the context of nutraceutical applications. A clinical trial currently underway in Brazil aims to evaluate the effects of grape seed flour supplementation in colorectal cancer patients with cachexia. Altogether, grape-derived compounds offer a safe, low-cost, and mechanistically grounded strategy for improving nutritional status and resilience in oncological care.