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AI Summary
- HIIT outperforms moderate zone 2 training for improving metabolic health, insulin sensitivity, and blood glucose control; even slightly elevated normal-range glucose harms brain aging and neurodegeneration
- Circadian-timed eating synchronized with sleep-wake cycles and HIIT training creates synergistic metabolic benefits; high HbA1c promotes vascular stiffness and cardiovascular disease risk
- Combined HIIT, circadian meal timing, and optimized sleep protocols dramatically improve metabolic resilience and protect against age-related cognitive decline and cardiovascular dysfunction