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If you thought it might be possible to be overweight or obese but not at increased risk of heart disease, think again! A new study of nearly 300,000 people has found that unhealthy weight gain can raise risk of heart attacks, strokes and high blood pressure.The risk of heart and blood vessel problems increases as body mass index (BMI) increases beyond 22-23 kg per square metre, said the study published in the European Heart Journal.