Discrepancy between self-reported and actual caloric intake and exercise in obese subjects. - Lichtmann,S.W.; Pisarska,D.K.; Berman,E.R.; Pestone,M.; Dowling,H.; Offenbacher,E.; Weisel,H.; Heshka,S.; Matthews,D.E.; Heymsfield,S.B. (New Engl J Med, 1992)