The Effects of Smiling Scientists have found that smiling has little effect on one’s mood. Following Charles Darwin’s idea that facial expressions can influence mood, scientists sought out to determine the accuracy of his theory. In a study for 'Psychological Bulletin,' scientists reviewed 50 years of data and found that smiling boosts happiness very minimally, if at all. The findings led scientists to estimate that if 100 people smiled, 7 may feel an increase in happiness as a result. Recent research has found that forcing a smile may have a negative effect. A study published in the 'Journal of Occupational Health Psychology' found that service workers who put on a fake smile were more likely to drink heavily after work.
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