For individuals with or at risk for coronary heart disease, data suggest that more than calories per week may have to be expended to improve cardiorespiratory fitness.

The correct answer is: 1400.

Explanation:

Coronary heart disease is a condition that occurs when there's a decrease in the amount of blood flow to the heart because of the buildup of atheromatous plaque in the coronary arteries, which provide blood to the muscle of the heart. This plaque is made of cholesterol and fat, so diet plays a big role in the development of this life-threatening disease. Smoking, obesity, diabetes, high blood pressure and a family history of coronary heart disease are important risk factors as well.

Coronary heart disease will eventually lead to heart failure and possibly death, so it needs to be treated as soon as it's diagnosed. There is no cure for this disease, but a change in one's lifestyle and a combination of medication can extend the life expectancy of the person who suffers from it.

The changes in lifestyle that are recommended to treat Coronary heart disease are: exercise, like walking or swimming, smoking cessation, weight control, and a healthier diet with minimal to none trans fats ingestion. Doctors recommend their patients with this condition a lower calorie intake, of about 1400 calories less per week.