A diet high in cholesterol is a diet that includes both cholesterol and saturated fat, which raises bad cholesterol levels in the body. High cholesterol leads to many health problems and should be treated as soon as possible to reduce health risks. This is accomplished by eliminating or finding substitutes for food in your diet that are either high in cholesterol or saturated fat, or both. Butter, red meat and most fast food products are high in cholesterol and should be avoided by people looking to lower the cholesterol in their diets.