The effects of laughter and other positive psychological interventions on the prevention of the onset and severity of lifestyle-related diseases. - The effects of laughter interventions on the prevention of the onset and severity of lifestyle-related diseases.

Among 42 participants, 40 participants were included in the analysis (laughter yoga group; n=20, control group; n=20). The mean HbA1c level changed from 7.12% to 6.86% in the laughter yoga group and from 7.20% to 7.27% in the control group (mean between-group difference for change of -0.33%, P= 0.008). Positive affect increased significantly only in the laughter yoga group. Sleep duration also increased, however statistically insignificant (P = 0.074), only in the laughter yoga group.