Atherosclerosis and the obvious danger of free floating cholesterol in the blood that can circulate and deposit anywhere, even in the arteries/veins while flowing which can also cause a blockage of arteries/veins and cause an embolism. Also fatty deposits in the cell's membrane that can make it more fluid than it should be causing the cell to lose its rigid membrane structure or even making it more rigid sometimes depending on the environment.
Carrying compacity affects communities because there is usually limited resources. If a population gets too high, they may die out.
