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Low-Carb Diet & HRV (N=1 Data)

Low-carb diets initially suppress HRV (weeks 1-4) followed by normalization by week 8, with the initial dip reflecting metabolic adaptation rather than stress.

N=1 Evidence

  • Sangram Sawant: Low-carb diet, no other changes
  • Marco Altini (low-carb phase): After caloric deficit that had improved HRV
  • Marco Altini (full arc): Low-carb initially suppresses HRV (weeks 1-4), re-normalizes by ~week 8

Devices: Oura Ring / unspecified.

This pattern — initial HRV suppression during metabolic adaptation followed by recovery — mirrors what is seen in caloric restriction and exercise training interventions.

Evidence