Rapid weight loss may trigger dangerous heart arrhythmias, studies warn
Losing weight can improve heart health, but doing it too quickly may harm the heart. Research shows that rapid weight loss can trigger irregular heart rhythms, known as arrhythmias. While shedding at least 10% of body weight reduces risks for those with obesity, extreme methods may cause more harm than good.
A 2020 animal study found that rats losing 16% of their body weight in just two weeks faced a higher risk of cardiac arrhythmias. Similar concerns were raised in a 2016 human study, which linked rapid weight loss to abnormal electrical signals in the heart. Symptoms like fatigue, muscle weakness, and dizziness often appear when weight drops too fast, usually due to electrolyte imbalances such as low potassium or calcium.
A 2022 study also connected poor nutrition—common in extreme diets—to arrhythmias. Electrolyte imbalances and inflammation from crash dieting can disrupt heart rhythms. Meanwhile, a 2019 study tracked people over 22 years and found that low-carb diets increased the risk of atrial fibrillation, a common type of arrhythmia.
Extreme exercise, weight-loss supplements, and surgery can also lead to rapid weight loss and heart issues. Symptoms of arrhythmias include palpitations, chest pain, confusion, and shortness of breath. Treatment often involves better nutrition, balanced electrolytes, medication, or medical procedures.
While losing weight can lower health risks, doing it too fast may trigger dangerous heart problems. Proper nutrition, gradual changes, and medical advice help prevent arrhythmias linked to extreme weight loss. Those experiencing symptoms like dizziness or palpitations should seek medical attention to avoid complications.
