The phrase "to increase heart attack risk" means that a particular action or condition is likely to raise the likelihood of experiencing a heart attack. This could be due to various factors such as high blood pressure, smoking, obesity, lack of exercise, poor diet, stress, and other lifestyle choices that can contribute to developing cardiovascular disease. When these risk factors are present in an individual's life, it increases the chances of having a heart attack or experiencing other serious health complications related to heart disease.