Calorie restriction reduced abnormal heart rhythms in obese mice
Calorie restriction producing 20% weight loss reduced time spent in an irregular heart rhythm to 22.7 seconds, versus 227 seconds in obese mice without weight loss.
Our read
Interventions- Studied:
- Experiments in 8 obese mice, against obese mice without weight loss
- What changed:
- Time in an irregular heart rhythm fell to 22.7 seconds with calorie restriction, versus 227 seconds in obese comparison mice
- The catch:
- Only eight mice received calorie restriction
- In the record:
- One of 4,194 papers on caloric restriction on record: 638 with results in people, 1,499 in animals.
- Why it’s aging research:
- It studies an intervention with evidence of extending healthy life.
Editor of record: Boris Djordjevic · AgingResearch.News
Mice with diet-induced or genetic obesity were compared with lean littermates in an animal experiment on obesity-related heart disease. After bursts of electrical stimulation, 94% of obese mice developed atrial fibrillation, an irregular heartbeat, versus 45% of lean mice. Each group included 16 mice.
Calorie restriction produced 20% weight loss in eight obese mice. Their atrial fibrillation burden was 22.7 seconds, compared with 227 seconds in the obese comparison group. No sudden deaths occurred after calorie restriction. Measurements in isolated hearts also found that electrical signals lasted longer and calcium signals approached lean values. The amplification of calcium release inside heart cells also approached lean values. The authors identified restoration of this amplification as a central mechanism behind the improvements.
Why it matters
Obesity-related heart disease is associated with irregular heart rhythms and sudden death. The findings point to calcium handling as a potential target for reducing these risks.
Caveats
Electrical activity and calcium handling were measured in isolated mouse hearts, not in people. The calorie-restriction results involved eight mice, and the conference abstract does not give the restriction’s duration or intensity.
Caloric restriction is part of Bryan Johnson's Blueprint
The paper
Carilion Clinic
AHA Scientific Sessions 2026 Abstract, Nov 2, 2026
Presented at AHA Scientific Sessions 2026, abstract 16246
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