The Blue Zones and the "Power 9" Lifestyle "Blue Zones" are geographically defined regions characterized by an exceptionally high concentration of centenarians who live long, healthy lives. The five original Blue Zones identified by Dan Buettner and demographic researchers are Okinawa (Japan), Sardinia (Italy), Nicoya (Costa Rica), Ikaria (Greece), and Loma Linda (California). Research into these regions identified nine shared lifestyle habits, termed the "Power 9":

1. Move Naturally: Engaging in low-intensity, daily physical activity like walking or gardening rather than structured exercise.
2. Purpose: Having a clear reason to wake up, known as Ikigai in Okinawa or plan de vida in Nicoya.
3. Downshift: Practicing daily stress-relieving rituals, such as napping or prayer, to reduce chronic inflammation.
4. 80% Rule: Stopping eating when 80% full (Hara hachi bu) to manage caloric intake and metabolic health.
5. Plant Slant: Consuming a predominantly plant-based diet rich in beans, whole grains, and vegetables, with minimal meat.
6. Wine at 5: Moderate, regular consumption of alcohol (especially antioxidant-rich wines), often with friends or food.
7. Belonging & Loved Ones First: Strong family ties, investing in children and aging parents, and belonging to faith-based communities.
8. Right Tribe: Curating close social circles that actively support healthy behaviors.

As modernization and Western diets encroach on original Blue Zones, their demographic distinctiveness is narrowing. Consequently, new models of longevity are emerging. Singapore has been dubbed "Blue Zone 2.0" for engineering longevity through proactive government policies, such as taxing sugary drinks, promoting accessible healthcare, and integrating parks and walkable spaces into urban design. Additionally, Hong Kong boasts one of the world's highest life expectancies despite a high-stress, high-meat-consumption environment; this is attributed to excellent public healthcare, walkable urban infrastructure, and strong family units. Other studied longevity hotspots include Bama, China, where a unique natural environment (trace elements, sunshine) and medicinal herbs contribute to healthy aging, in Acciaroli, Italy,

The Blue Zone concept has faced intense academic scrutiny. Dr. Saul Newman, an Ig Nobel Prize winner, argues that exceptional longevity claims are largely the result of "lousy birth-and-death recordkeeping," clerical errors, and pension fraud. Newman points out that many purported supercentenarians lack birth certificates and that longevity hotspots often correlate with high poverty and illiteracy. In contrast, original Blue Zone researchers and demographers fiercely defend their findings. They emphasize that Blue Zone designations rely on rigorous age-validation protocols—such as cross-referencing civil registries, ecclesiastical archives, and family reconstructions—which proactively weed out fraudulent or erroneous claims before data analysis.

While lifestyle plays a massive role, genetics and the "exposome" (cumulative environmental exposures) are also critical. Longevity is supported by specific genetic variants (e.g., FOXO3, APOE) that protect against cardiovascular disease and oxidative stress. Furthermore, diverse gut microbiomes—fostered by fiber-rich, plant-based diets—help reduce systemic inflammation ("inflammaging"), which is a primary driver of age-related decline.

The core principles derived from Blue Zones—natural movement, community integration, stress reduction, and dietary moderation—provide a proven, actionable framework for preventive medicine and public health globally.