Rising R, Alger S, Boyce V, Seagle H, Ferraro R, Fontvieille A M, Ravussin E
Clinical Diabetes and Nutrition Section, National Institutes of Diabetes, Digestive Diseases, and Kidney Diseases, National Institutes of Health, Phoenix, AZ 85016.
Am J Clin Nutr. 1992 Feb;55(2):343-9. doi: 10.1093/ajcn/55.2.343.
Measuring food intake in a laboratory usually involves limited food choices. An automated food-selection system with two vending machines containing a large variety of foods was used to measure food intake in 10 male volunteers (31 +/- 6 y, 69.2 +/- 7.1 kg, 18 +/- 7% fat, mean +/- SD) on a metabolic ward. The effect of carbohydrate, fat, and protein intakes on 24-h energy expenditure (24EE) and substrate oxidations was measured in a respiratory chamber during day 4 of weight maintenance and day 7 of ad libitum intake. Ad libitum intake resulted in a 7-d overfeeding of 6468 +/- 3824 kJ/d above weight-maintenance requirements, leading to a 2.3 +/- 1.2-kg gain. The 10,975 +/- 3774 kJ excess energy intake on day 7 of ad libitum intake caused a 1205 +/- 920 kJ/d increase in 24EE (delta 24EE = 0.17 x delta intake - 695; r = 0.71, P less than 0.02). Of the excess carbohydrate intake, 74% was oxidized (r = 0.86, P less than 0.001), whereas excess fat intake was not. Carbohydrate and protein stores are regulated whereas excess fat intake is channeled to fat stores.
在实验室中测量食物摄入量通常涉及有限的食物选择。我们使用了一个自动食物选择系统，该系统有两台自动售货机，里面装有各种各样的食物，用于测量10名男性志愿者（年龄31±6岁，体重69.2±7.1千克，体脂率18±7%，均值±标准差）在代谢病房的食物摄入量。在体重维持期的第4天和自由进食期的第7天，在呼吸室内测量碳水化合物、脂肪和蛋白质摄入量对24小时能量消耗（24EE）和底物氧化的影响。自由进食导致7天内每日摄入超过体重维持需求6468±3824千焦，体重增加2.3±1.2千克。自由进食期第7天摄入的10975±3774千焦多余能量使24EE每日增加1205±920千焦（Δ24EE = 0.17×Δ摄入量 - 695；r = 0.71，P<0.02）。多余的碳水化合物摄入量中，74%被氧化（r =
