SYSTEMATIC REVIEW article
Front. Nutr.
Sec. Nutrition and Metabolism
Volume 12 - 2025 | doi: 10.3389/fnut.2025.1664600
This article is part of the Research TopicRamadan Intermittent Fasting Model as a Catalyst for Healthy Aging and Disease MitigationView all articles
Comprehensive Impact of Intermittent Hypoxia Training and Intermittent Fasting on Metabolic and Cognitive Health in Adults with Obesity: An Umbrella Systematic Review and Meta-analysis
Provisionally accepted- Department of Nursing, Lianyungang Higher Vocational College of Traditional Chinese Medicine, Lianyungang, China
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Background: Obesity has emerged as a global health crisis, posing significant challenges to metabolic function and cognitive health. It is associated with insulin resistance, elevated triglycerides, and reduced HDL cholesterol levels. Cognitive decline in obesity involves multifactorial pathways including neuroinflammation, vascular dysfunction, and blood-brain barrier disruption. Intermittent Hypoxia Training (IHT) and Intermittent Fasting (IF) have shown promise as non-pharmacological interventions for these obesity-related issues. Objectives: This systematic review and meta-analysis aim to evaluate the effects of IHT, IF, and their combination on metabolic markers (insulin sensitivity, lipid profiles, glucose levels) and specific cognitive domains (memory, executive function, attention) and cognitive function in obese adults. Methods: The analysis encompassed studies published from October 2014 onward, sourced from PubMed, Web of Science, Scopus, and other relevant databases. The inclusion criteria were randomized controlled trials and non-randomized comparative studies focusing on IHT, IF, or their combination. Study quality was assessed using the Newcastle-Ottawa Scale and the Cochrane risk bias tool. Data synthesis was performed using a random-effects model, with heterogeneity assessed via I² statistics. Results: The review included 28 studies involving 2,134 participants, followed up for an average of 12 weeks. Among these, 15 were RCTs and 13 were observational studies. The participants had a mean age of 45±12 years, with 60% being female. The combined IHT and IF intervention demonstrated superior benefits, with significant weight loss (mean reduction: 6.3 kg, 95% CI: -8.2 to -4.5 kg). Cognitive performance showed domain-specific improvements: memory (SMD=0.60, 95% CI: 0.43-0.77) and attention (SMD=0.57, 95% CI: 0.40-0.74), though with significant heterogeneity (I²>50%). Egger's test indicated minimal publication bias (p = 0.18). Conclusion: Our meta-analysis reveals that IHT and IF may serve as promising non-drug strategies for improving metabolic and cognitive outcomes in adults with obesity. Given the short-term evidence and methodological heterogeneity, long-term studies are needed to confirm these findings.
Keywords: intermittent fasting, Metabolism, Cognition, Obesity, Intermittent Hypoxia Training
Received: 12 Jul 2025; Accepted: 30 Sep 2025.
Copyright: © 2025 Guo, Zhang, Chen and Liu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Ning Zhang, 1051967080@qq.com
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