Despite regular exercise and a normal body weight, my mom was diagnosed with dyslipidemia a few years ago. Her doctor told her to change her diet, so she eliminated a lot of processed foods like french fries, microwave popcorn, store bought baked goods, and chips.
She still ate all of these foods, but she made them herself or checked the label to make sure they didn't contain any trans fat. Along with these dietary changes, her doctor also put her on prescription drugs for hypertension treatment.
Now my mom's cholesterol levels have become more normal. I think the dietary changes were largely responsible for this because she has always been very active and somewhat health-conscious.