Exercise regularly (especially aerobic activity and resistance training)
Maintain a healthy weight
Eat a Mediterranean-style diet
Choose unsaturated fats (olive oil, nuts, seeds, avocado)
Include fatty fish (salmon, sardines, mackerel) several times per week
Replace refined carbs with whole grains and fiber-rich foods
Limit added sugars and refined starches
Avoid trans fats
Limit saturated fat intake
Stop smoking
Limit alcohol to moderate levels if you drink (do not start drinking for HDL)
Manage insulin resistance and blood sugar (if applicable)
Control triglycerides with diet, exercise, and treatment as needed
Get adequate sleep and address sleep apnea if present
Manage stress
Review medications with a clinician if HDL is low (some therapies can affect lipids)