Pacanowski, C. R., & Levitsky, D. A. (2015). Frequent self-weighing and visual feedback for weight loss in overweight adults. Journal of Obesity. doi:

For references of the power of prayer and meditation to replenish willpower, see: McCullough, M. E., & Willoughby, B. L. B. (2009). Religion, self-regulation, and self-control: Associations, explanations, and implications. Psychological Bulletin, 135(1), 69-93. doi: 10.1037/a0014213 and Baumeister, R. F., & Tierney, J. (2011). Willpower: Rediscovering the greatest human strength. New York: Penguin Group, 180.