Dr Angelo Tremblay discusses obesity prevention in 2011 and beyond. This is part one of his presentation, which focuses on the role of sleep in the prevention of obesity.

1. How do wepreventobesityin 2011? Angelo Tremblay Division of Kinesiology

3. By promotingadequatesleep

4. By increasing the physicalwork/cognitive effort ratio

5. By investing in nutrition competence and healthyfoodavailability

6. By promotinghealthyfood-relatedbehaviours

8. Risk factors for overweight and obesity in adulthood: Results from the Quebec Family Study Risk factors Adjusted OR BW (kg) vs (cross-sectional) reference category (6 y follow-up) Short sleep duration 3.81* 1.65 High disinhibition eating 3.8* 1.46 behavior Low dietary calcium intake 2.88* 1.3 High susceptibility to hunger 2.2* 1.28 behavior Non-participation in high-intensity 2.03* 1.23 physical exercise High dietary restraint behavior 2.01* 1.09 Non-consumption of multivitamin 1.86* 0.87 and dietary supplements High dietary lipid intake 1.64** 0.61 High alcohol intake 1.37** 0.39 *p < 0.01, ** p < 0.05 Adapted from Chaput et al, Obesity 2009

10. By promotingadequatesleep

11. By increasing the physicalwork/cognitive effort ratio

12. By investing in nutrition competence and healthyfoodavailability

13. By promotinghealthyfood-relatedbehaviours

15. Mean body composition in female short sleepers 5-6 hours 7-8 hours (n=42) (n=239) Weight (kg) 75.7 70.5* BMI (kg/m2) 29.8 27.3* Body fat mass (kg) 29.2 23.3* Body fat (%) 36.1 31.6* Waist girth (cm) 88.1 83.2* Sum of 6 skinfolds (mm)168.9 144.2* * Significant difference (p<0.05). Chaput et al.Obesity15: 253-261, 2007

16. Correlations between sleep duration and body weight in boys of the “Québec en Forme” Project r = –0.33, p < 0.01 n = 211 *adjusted for age Chaput et al.Int. J. Obes. 30: 1080-1085, 2006.

17. Relationship between potential risk factors and childhood overweight/obesity Adapted from Chaput et al.Int. J. Obes. 30: 1080-1085, 2006.

18. Acute partial sleepdeprivationincreasesfoodintake in healthy men Values are means. * p < 0.01 AdaptedfromBrondel et al, AJCN 91:1550-59, 2010

19. From Schmid et al. AJCN 90: 1476-82, 2009