The Dr. explains: "The college students were more aggressive against a complete stranger if they drank the lemonade sweetened with Splenda." Splenda has no calories, and therefore they didn't have the self-control they needed to not be annoyed.
The Sweet Revenge Study
In this study, Bushman and other researchers recruited couples from across the country. Their hypothesis was that by studying the couples for 23 days, they'd discover that if one person in the relationship had diabetic symptoms (like fatigue), they'd be less likely to forgive their significant other if they were wronged.
Bad news: they were right. "As expected, diabetic symptoms correlated negatively with cooperative behavior, b = (-.16, t(176) = -2.17, p = .03, r = -0.16." DUH, RIGHT? No, seriously, that math is real. It continues, "type 2 diabetic symptoms related to less actual forgiving behavior."