Nutrients

Objective: To systematically evaluate the potential of Saussurea involucrata cultures (SICs) against high-altitude illness under hypobaric hypoxia and establish a progressive experimental evidence chain covering acute hypoxia tolerance enhancement and acute/chronic hypoxic injury protection. Methods: A tiered experimental strategy was employed. Key findings were derived from primary rat models of acute (5500 m, 8 h) and chronic intermittent (5500 m, 8 h/d, 4–8 weeks) hypobaric hypoxia. A mouse acute tolerance model (10,000 m lethality, closed-system endurance) provided supplementary verification. Comprehensive analyses included survival, hemorheology, multi-organ function, and core mechanistic indicators of endothelial function and oxidative stress. Diamox, Rhodiola, and Compound Danshen Dripping Pills served as positive controls. Normoxic/hypoxic blank groups served as negative controls. Results: SICs significantly enhanced acute hypoxia tolerance in mice. In the rat models, SICs demonstrated dose-dependent and selective regulation of the endothelial–oxidative stress/hemorheology axis. Specifically, it downregulated endothelin-1, upregulated nitric oxide, enhanced total antioxidant capacity, and improved chronic hypoxia-induced blood hyperviscosity. Medium doses showed consistent optimal efficacy. SICs had limited effects on macroscopic organ remodeling. Conclusions: The core protective effect of SICs lies in enhancing hypoxic tolerance and selectively modulating the interconnected pathways of endothelial function, oxidative stress, and microcirculatory health. This mechanistic profile supports its potential as a preventive or early adjuvant intervention for high-altitude illness, providing a systematic preclinical foundation for translational development.

Background: Cognitive disorders are a class of neurological diseases characterized by declines in cognitive function, imposing a heavy physical and mental burden on middle-aged and elderly individuals. Since the underlying mechanisms of cognitive disorders are not yet fully understood, and different types of cognitive disorders may involve distinct mechanisms, the development of drugs with multi-target therapeutic and preventive effects is of great significance. Currently approved drugs for Alzheimer’s disease, such as acetylcholinesterase inhibitors and NMDA receptor antagonists, show limited efficacy and poor prognosis, highlighting the urgent need for safe and effective alternative treatments. Methods: Plant-derived polysaccharides (PDPs) possess antioxidant, anti-inflammatory, neuroprotective, and immunomodulatory activities, and polysaccharides derived from traditional Chinese medicine, in particular, show great potential for treating cognitive disorders. In recent years, interventions with plant polysaccharides that modulate the gut microbiota to affect the “gut–brain axis” and improve cognitive function have become an emerging research focus. Clinical evidence has also increasingly supported the beneficial effects of polysaccharides on cognitive disorders. Therefore, this study focuses on plant polysaccharides in the intervention of cognitive disorder-related diseases, including both in vivo and in vitro experiments, and summarizes existing findings according to different mechanisms of action. Results and Conclusions: Relevant clinical reports are incorporated to provide a theoretical basis and strong support for the development of polysaccharide-based interventions and new drug development for cognitive disorders.

Background. The Mediterranean dietary pattern (MDP) is recognised as one of the most evidence-based dietary models for the prevention of non-communicable diseases (NCDs). Its plant-rich composition suggests an inherently high potassium intake, yet epidemiological findings on the association between MDP adherence and potassium intake remain heterogeneous. The present review aims to summarise and critically evaluate the available evidence on the association between adherence to the MDP and dietary potassium intake in the adult population. Methods. We conducted a narrative review of observational, longitudinal and interventional studies evaluating the relationship between MDP adherence and dietary potassium intake (self-reported assessment and/or 24 h urinary potassium). MEDLINE/PubMed was searched from inception to 30 October 2025, additional studies were identified by reference screening. Results. From a total of 263 studies retrieved, 10 eligible studies (7 cross-sectional, 1 longitudinal, 2 randomised controlled trials) from Europe, Asia and North America were synthesised. Questionnaire-based studies consistently indicated higher potassium intake with greater MDP adherence, whereas biomarker-based findings were more variable and often attenuated, particularly in studies relying on single or unvalidated 24 h urine collections and selected samples. Overall risk of bias was high for most observational studies, while randomised trials were generally rated as having some concerns. Conclusions. Higher MDP adherence is generally associated with higher potassium intake, but estimates vary by how MDP adherence is defined and scored, the potassium assessment method, and population context. Current evidence remains insufficient to quantify potassium’s potential contribution as a candidate mediator without formal mediation analyses and robust exposure assessment, including repeated validated 24 h urine collections. Standardised scoring, routine reporting of potassium, sodium, and the Na/K ratio, and triangulation across dietary, biomarker and intervention evidence are key priorities to strengthen inference.