Corwin R L, Wojnicki F H, Fisher J O, Dimitriou S G, Rice H B, Young M A
Nutrition Department, College of Health and Human Development, The Pennsylvania State University, University Park 16802, USA.
Physiol Behav. 1998 Dec 1;65(3):545-53. doi: 10.1016/s0031-9384(98)00201-7.
Restricting access to high-fat foods is a common strategy utilized to promote health. This strategy may contribute to episodes of overconsumption, however, when the restricted foods subsequently become available. The present study utilized a rat feeding procedure to determine if restricting access to an optional source of dietary fat would increase later consumption of that food under nonenergy-deprived conditions. Five groups of male Sprague-Dawley rats were used, all of which had continuous access to a standard rodent diet and water. The control group had no access to shortening. The low-restriction group had 2-h access to shortening every day. The high-restriction group had 2-h access to shortening on Monday, Wednesday, and Friday. Two additional groups were switched between the high and low conditions. Two-hour and 24-h food intakes were measured every day for 6 weeks. At the end of the study rats were sacrificed and carcass composition determined. As access to the shortening decreased, consumption during the 2-h access period increased. Rats compensated for the increased shortening consumption by decreasing intake of the standard diet. Thus, cumulative energy consumption did not differ among the groups. When switched between the high and low conditions, rats rapidly adjusted to the change in shortening availability. There were no effects of access schedule on carcass composition. These results indicate that restricting access to an optional high-fat food, even under nonenergy-deprived conditions, can promote significant increases in the consumption of that food when it subsequently becomes available.
限制获取高脂肪食物是促进健康的常用策略。然而，当这些受限食物随后变得可得时，该策略可能会导致过度消费的情况发生。本研究采用大鼠喂食程序，以确定在非能量缺乏条件下，限制获取可选的膳食脂肪来源是否会增加该食物随后的消费量。使用了五组雄性斯普拉格-道利大鼠，所有大鼠均可持续获取标准啮齿动物饮食和水。对照组无法获取起酥油。低限制组每天有2小时可获取起酥油。高限制组在周一、周三和周五有2小时可获取起酥油。另外两组在高限制和低限制条件之间切换。每天测量2小时和24小时的食物摄入量，持续6周。在研究结束时，处死大鼠并测定胴体组成。随着获取起酥油的机会减少，2小时获取期内的消费量增加。大鼠通过减少标准饮食的摄入量来补偿起酥油消费量的增加。因此，各组之间的累积能量消耗没有差异。当在高限制和低限制条件之间切换时，大鼠迅速适应了起酥油可得性的变化。获取时间表对胴体组成没有影响。这些结果表明，即使在非能量缺乏条件下，限制获取可选的高脂肪食物也会在该食物随后变得可得时显著促进其消费量的增加。
