LDL is a major risk factor for heart disease. (It isn't the best value to predict heart disease risk, that is ApoB. But unfortunately, standard medical practice hasn't adopted this yet.)
So my high LDL is... not good. Unfortunately, the effect of lifestyle changes on LDL is limited, and my risk is still far away from what would receive medication. (Some doctors think that far more people should receive medication, which I find a very interesting debate, but that's another story.)