Consumption of sugar affects the level of unmetabolized sugar in the blood; ... ...

Consumption of sugar affects the level of unmetabolized sugar in the blood; the level rises following consumption of sugar. Yet people who consume large amounts of sugar tend to have below-average levels of unmetabolized sugar in their blood. Which one of the following, if true, helps most to resolve the apparent paradox described above?
(A) Persons who are overweight tend to have below-average levels of unmetabolized sugar in their blood.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT67): Logical Reasoning B