Mediterranean diet interventions and pomegranate juice consumption measurably reduce carotid intima-media thickness (CIMT)—a validated ultrasound marker of early atherosclerosis—while simultaneously improving memory, attention, and executive function. Specific polyphenols including resveratrol, epigallocatechin gallate, and punicalagin drive these effects through reduced oxidative stress, suppressed inflammatory cytokines, and enhanced nitric oxide availability. This dual vascular-cognitive benefit represents a significant advancement in understanding how dietary antioxidants combat aging at the cellular level. The CIMT measurement provides objective evidence that polyphenol interventions don't just correlate with better outcomes—they produce measurable structural improvements in arterial walls. This mechanistic clarity strengthens the case for food-based interventions over isolated supplements, as whole foods deliver synergistic polyphenol profiles. The finding bridges cardiovascular and neurological health, supporting the vascular hypothesis of cognitive decline. However, optimal dosing remains undefined, and most studies focus on Mediterranean populations with established dietary patterns. The challenge lies in translating these benefits to diverse populations with varying baseline diets and determining whether shorter intervention periods can produce lasting vascular remodeling.