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. ███████████ ████████████ ██████ ████████ ███ ████ ██ ████████ █████ ███████ ███ ███████ ███ ██ ███ ███████████ ████████ ████ ████████████ ████████████ ██████ ████ ███████ ████████ █████ ███████ ███ ███████ ██████ ███████ ████████ █████████ █████ █████ ██ █████ ███████ ███ ██████ ███ ██████ ██ █████ ████ ██ ████ ███ ████ ███████ ████████ ███ █████ ██████ ███ ██████████ ██████████ ████ █████ ████ ██ ████████ █████ ███████ ███ ███████
The author hypothesizes that HDLs prevent heart disease and stroke. This is based on a few phenomena: cardio increases HDL levels, women have higher HDL levels, and both cardio and being female are correlated with a lower risk of heart disease and stroke.
The author assumes causation from correlation. There could be a number of other factors that explain the phenomena described. For example, maybe exercise just improves overall health, and maybe women tend to exercise more than men, which is why exercise and being female are correlated with fewer heart issues.
Each of the following, if █████ ███████████ ███ ████████ ███████
HDLs, unlike LDLs, ████ ███ ████ ███████ ████████████
Persons who are ██████████ ████ ██ ████ █ ██████ ████ ██ █████ █████ ███ ██ ████████ █████ ███████ ███ ███████ ███ ████ ██ ████ ███ ██████ ██ █████
HDLs are less ██████ ███████ ████ ███ ███████████ ████ ███ █████
A high level ██ ████ █████████ ███ █████████ ██████ █████ ██████████ ████ █████
Men whose level ██ ████ ██ █████ ██ ███ ███████ █████ ███ █████ ████ ████ █████ ██ ████ █ █████ ████ ██ ████████ █████ ███████ ███ ██████ ████ ████ ██ ████ ████