Beyond making you cranky and impatient, it turns out that being hungry—or more specifically, having low blood sugar—may actually change the way that you make decisions. In a new study published in the journal Psychological Science, University of South Dakota researchers X.T. Wang and Robert D. Dvorak found that people with lower blood sugar levels were more likely to opt for immediate rewards, while people with higher blood sugar counts tended to opt for more distant, but larger, rewards.