Quit smoking (if you/they do), avoid excess meat and animal products and do some aerobic exercise. Eat alot of fiber, even drinking a bit of alcohol once in a while helps (I recommend a good local microbrew beer). You shouldn't try to raise your "good" HDL cholesterol. You should focus mainly on regulating your "bad" LDL cholesterol count. Either form of cholesterol comes mainly from anything containing any kind of animal based fat. This includes cheese, eggs, and even human milk. It is a vital, internally recycled structural molecule vital in the generation of cell membranes and hormones. It circulates in the bloodstream as part of the plasma. HDL molecules are more stable than LDL molecules, which are smaller, more variable, and more likely to collect and concentrate into arterial blockages
Anyway... You can normalize your cholesterol levels by forcing your body to process and get rid of the excess cholesterol in your system.