Scientists at the Yale School of Medicine may have found a way to mimic the anti-aging benefits of calorie restriction without extreme dieting.
Published in Nature Aging, their study targets an immune protein called complement component 3 (C3), a key driver of age-related inflammation.
The Calorie Restriction Problem
Cutting calories extends lifespan in animals, but severe restriction carries risks like weakened immunity, impaired growth, and reduced fertility.
Discovering the C3 Target
Data from the human CALERIE trial showed that cutting calories by ~14% significantly lowered plasma levels of C3:
- Fat Tissue Source: C3 is produced mainly by macrophages (immune cells) in white fat tissue.
- Inflammation Driver: As the body ages, rising C3 levels fuel chronic background inflammation ("inflammaging").
- Weight-Loss Independent: C3 levels dropped regardless of actual weight lost, showing fat tissue responds directly to dietary cues.
Mimicking Longevity Benefits
Blocking C3 activation with medication in mice successfully reduced age-related inflammation without changing their diet. Researchers are now exploring FDA-approved C3 inhibitors to see if restoring healthy protein balance can extend human healthspan without strict dieting.
Source: Science Daily
