Components of energy balance ( resting metabolic rate , physical activity thermogenesis , energy intake ) and 24-h glycemic responses were measured under free-living conditions with random allocation to daily breakfast ( 700 kcal before 1100 ) or extended fasting ( 0 kcal until 1200 ) for 6 wk , with baseline and follow-up measures of health markers ( eg , hematology/biopsies ) .