Cholesterol, which is a known factor in coronary heart disease and stroke, needs a carrier, known as a lipoprotein, to transport it through the bloodstream  Low-density lipoproteins (LDLs) increase the risk of coronary heart disease and stroke, but we can tentatively conclude that high-density lipoproteins (HDLs) help prevent coronary heart disease and stroke  First, aerobic exercise increases one' s level of HDLs  Second, HDL levels are higher in women than in men
And both aerobic exercise and being female are positively correlated with lower risk of coronary heart disease and stroke
Persons who are overweight tend to have a higher risk of early death due to coronary heart disease and stroke, and tend to have low levels of HDLs.