Eating saturated and trans fats found in animal products and processed foods, as well as foods high in cholesterol like red meat and full-fat dairy, can raise cholesterol levels. Lack of exercise and obesity increase risk of high cholesterol, while exercise boosts good cholesterol and improves cholesterol particles. Smoking damages blood vessels and may lower good cholesterol, putting one at risk. Age, diabetes, and high blood sugar also increase cholesterol risks as the body changes over time.