Observation studies have shown that overweight in patients with congestive heart failure is associated with lower risk of all-cause mortality and cardiovascular mortality. This is called the paradox of obesity. Other studies do not support this correla-tion. In conclusion, a stable body weight is recommended for patients with a BMI of 25-29.9 kg/m². If BMI ≥ 40 kg/m², weight loss is recommended. There is no consensus for weight reduction if BMI is 30-40 kg/m².