Heart disease is the leading cause of death globally, and weight is one of the modifiable risk factors. The relationship with BMI is real but less linear than with diabetes — here is what the major studies show.
The big picture
A meta-analysis of over 4 million adults found that, compared to BMI 22.5–25, the risk of dying from cardiovascular disease was 39% higher at BMI 30–35 and 138% higher at BMI 35–40.
High blood pressure, high LDL cholesterol, sleep apnea, and atrial fibrillation are all more common in higher BMI ranges — and each is an independent contributor to heart events.
The "obesity paradox"
In some patient populations — particularly people who already have heart failure or chronic kidney disease — slightly higher BMI is associated with better survival. This is the obesity paradox.
It probably reflects metabolic reserves during illness rather than a genuine protective effect of fat. For a healthy adult without disease, lower BMI within the normal range is still the lower-risk position.
Where waist matters more than weight
For cardiovascular risk specifically, abdominal fat is more dangerous than fat distributed elsewhere. Two adults at the same BMI can have very different heart-attack risk if one has a 110 cm waist and the other has 85 cm.
A waist-to-hip ratio above 0.9 (men) or 0.85 (women) indicates abdominal obesity and elevated cardiovascular risk independent of total BMI.
What weight loss does
Even modest sustained weight loss reduces blood pressure (about 1 mmHg per kg lost), improves cholesterol profiles, and lowers atrial fibrillation risk. A 10% weight reduction can reverse some structural heart changes seen on echocardiogram.
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