Which of the following is considered a cardiac risk factor?

Obesity is considered a significant cardiac risk factor because it can lead to a number of cardiovascular issues. Excess body weight is associated with higher levels of cholesterol and triglycerides, increased blood pressure, and insulin resistance, all of which can contribute to the development of heart disease. Additionally, obesity can put extra strain on the heart, leading to complications such as heart failure and increased risk for heart attacks.

In contrast, other factors listed are not considered risk factors for heart disease. A low sodium diet can actually help reduce blood pressure and is beneficial for heart health. High levels of physical activity are typically associated with a lower risk of cardiovascular disease, as physical activity strengthens the heart and improves circulation. Young age is generally protective against heart disease, as risk tends to increase with age due to the cumulative effect of risk factors over time.