Ancient people say: the waistband is long, short life, a fat hundred diseases. The impact of obesity on health is getting more and more attention. So how to determine obesity? Here is a simple method recommended, body mass index method. Body mass index (BMI) formula: BMI = weight (Kg) / height (m) 2 BMI <25 for normal, 25 ≤ BMI <30 for overweight, BMI ≥ 30 for obese. Some studies have shown a correlation between obesity and atrial fibrillation. A total of 5282 subjects were enrolled in the study, and the investigators divided the enrolled individuals into normal weight group, overweight group and obese group based on body mass index (BMI) with an average follow-up of 13.7 years, and 526 cases developed atrial fibrillation during the follow-up period. Among individuals of both sexes, the rate of atrial fibrillation increased in all 3 groups with different BMIs. The incidence of AF was 9.7/1000 person-years, 10.7/1000 person-years and 14.3/1000 person-years and 5.1/1000 person-years, 8.6/1000 person-years and 9.9/1000 person-years in men and women, respectively, from the normal weight group, overweight group to the obese group. It is not difficult to conclude that approximately 50% of obese men and women are more likely to develop atrial fibrillation compared to normal weight groups. those with a BMI above normal have a 4% increased risk of developing atrial fibrillation for every 1 unit increase in BMI and are more likely to develop persistent atrial fibrillation. However, does a lower BMI reduce the incidence of atrial fibrillation? In the United States, in a 12-year follow-up of 34,309 women in health care, a subgroup of women (599) who reduced from obesity to a BMI <30 had significantly fewer episodes of atrial fibrillation at subsequent follow-up. Another study showed that obesity also has an effect on the recurrence rate of radiofrequency ablation of atrial fibrillation, showing after multivariate analysis that increased bmi can be an independent predictor of failure of radiofrequency ablation of atrial fibrillation, with an 11% increase in the likelihood of recurrence after atrial fibrillation for every 1 unit increase in bmi. The mechanism by which obesity causes AF is not fully understood and may be associated with obesity-mediated left atrial enlargement and left ventricular diastolic insufficiency. Given the impact of dynamic changes in BMI on atrial fibrillation, clinicians caution about the importance of weight control in obese patients with atrial fibrillation and the potential for weight loss to reduce atrial fibrillation episodes and recurrence after ablation. We advocate safe, healthy and effective weight loss methods: 1. Develop good eating habits, eat regularly, do not overeat, eat three meals a day on time, match meat and vegetables with meals, control staple foods and limit sweets to ensure balanced and comprehensive nutrition. 2, work and rest to have regularity. A good routine is not only good for your health, but also for weight loss. 3, the right amount of exercise is essential for healthy weight loss. Life is exercise, the right amount of exercise not only to lose weight, but also to enhance physical fitness, good health. Exercise to lose weight is one of the most direct and effective weight loss methods, daily exercise for half an hour is appropriate, to slowly develop a habit. Specifically to the individual, should be based on their own physical characteristics to choose the right food and methods of weight loss, do not be too hasty, and ultimately hurt the body. Another study showed that obesity also has an effect on the recurrence rate of radiofrequency ablation of atrial fibrillation, and multivariate analysis showed that increased bmi can be an independent predictor of failure of radiofrequency ablation of atrial fibrillation, and the likelihood of recurrence of atrial fibrillation after surgery increased by 11% for every 1 unit increase in bmi. The mechanism by which obesity causes atrial fibrillation is not fully understood and may be associated with obesity-mediated left atrial enlargement and left ventricular diastolic insufficiency.