According to a recent study, drinking coffee doubles certain fast food health risks. Apparently washing down a fast food meal with coffee can double blood sugar levels, raising them to levels on par with patients at risk of diabetes. In the study, six men were given a cocktail of fats and six hours later then had a sugary drink.

Their blood sugar levels were 32% higher than others who had no fat, but another group given the equivalent of two cups of coffee five hours after the fat cocktail showed blood sugar levels 65% higher than baseline. Fats impair the body's ability to produce insulin, which removes sugar from the blood. One of the study researchers at the University of Guelph in Canada said that having sugar remain in the body for long periods is unhealthy because it can lead to organ damage.