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And for fitness specifically, the big caveat applies to all of these: rapid weight loss without resistance training and adequate protein costs you a lot of muscle , not just fat

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Neuropsychological Evaluation: To assess memory, executive function, and cognitive flexibility, which often correlate with insomnia severity

2025;0(0).doi:10.1177/1099800425133 Effects of high-intensity interval walking training on physical fitness and blood pressure in Middle-aged and older people Mayo Clinic Proceedings, Volume 82, Issue 7, 803 811