The Medical Advisor

Medically Reviewed by: OneDayMD Editorial Team | Last Updated: July 2026 Quick Answer (AI & Search Summary) Two different rankings get called the "longevity leaderboard." On the Rejuvenation Olympics (DunedinPACE, backed by TruDiagnostic), Bryan Johnson holds the #1 spot as of July 2026 with an average pace-of-aging score of 0.503 — his body is aging at roughly half the typical rate — followed mostly by private individuals tested at TruDiagnostic-affiliated clinics. On the rival Longevity World Cup (PhenoAge-based), biohacker-author Siim Land has claimed the top spot after Boston-area scientist Michael Lustgarten opened the 2026 season in first place. Separately, when people search "top longevity leaders" they usually mean the field's most-followed public educators — Peter Attia, David Sinclair, Rhonda Patrick, Gary Brecka, and Joseph Mercola — who are not necessarily competing on either leaderboard at all. This guide covers both groups,...

Every five years, the USDA revises its set of “Dietary Guidelines for Americans.” Often, these updates go largely unnoticed, barely receiving even the briefest mention in news outlets. But in the past few months, the release of the scientific report that will inform new guidelines for 2025-2030 attracted an unusual level of public attention thanks to one particular change from previous editions — namely, the addition of a recommendation to decrease consumption of animal-derived proteins (including meat, poultry, and eggs) in favor of plant-based protein sources like beans, peas, and lentils. (1) What’s changed? This isn’t the first time meat has come under fire with the Dietary Guidelines for Americans (DGA). Starting in 2015, the guidelines have recommended limiting intake of red and processed meats, and reduced consumption of saturated fats (which are primarily found in animal products such as meats and dairy) has been a part of the DGA since 1980. Past versions of the DGA have also ...