Background Paragraph: Although some lipids in the diet are essential, excess dietary lipids can be harmful. Because lipids are very high in energy, eating too many may lead to unhealthy weight gain. A high-fat diet may also increase lipid levels in the blood. This, in turn, can increase the risk for health problems such as cardiovascular disease. The dietary lipids of most concern are saturated fatty acids, trans fats, and cholesterol. For example, cholesterol is the lipid mainly responsible for narrowing arteries and causing the disease atherosclerosis. 
Story: Greg is a doctor with the city hospital. Today, he is seeing two patients, patient A and patient B. Patient A maintains a high-fat diet, but patient B does not maintain a high fat diet. Greg is advising the patients how lifestyle change can improve their health.
Which patient would have less lipid in the blood, patient A or patient B? Which patient would have more lipid in the blood, patient A or patient B? Which patient would have narrower arteries, patient A or patient B? Which patient would less likely gain weight, patient A or patient B? Which patient would less likely risk cardiovascular disease, patient A or patient B? Which patient would more likely gain weight, patient A or patient B? Which patient would more likely risk cardiovascular disease, patient A or patient B? Which patient would not have narrower arteries, patient A or patient B? Would patient A have more or less lipid in the blood than patient B? Would patient B have more or less lipid in the blood than patient A?