Cellular biology
What Is NAD+ and Why Does It Decline With Age?
The coenzyme behind every energy transaction in your cells — and what the research says about why levels fall in midlife.
Featured
The 5 Things GLP-1 Weight Loss Quietly Takes — and the One Molecule Involved in All of Them
Rapid weight loss has a biological cost, and most people were never told the invoice existed. What physicians are seeing in GLP-1 patients — and the coenzyme at the center of it.
SponsoredHealthspan Weekly Editorial Team · 8 min read
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Body composition
Muscle Loss During Rapid Weight Loss: What the Research Shows
How much of fast weight loss is lean mass, why it matters metabolically, and what protects it.
Sleep
Why Sleep Quality Drops After 40 — and What Helps
Deep sleep shrinks decades before you notice. The architecture behind it, and the habits with real evidence.