How to know whether your 'metabolic health' is fine and what to do about it

“Metabolic health” is a wellness catchphrase that is hard to escape. Health Secretary Robert F. Kennedy Jr. has made it a pillar of his “Make America Healthy Again” agenda. Dr. Casey Means, the nominee for surgeon general, wrote a bestseller explaining how to achieve it. Influencers claim it’s the key to longevity.