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1 Department of Human Biology, Maastricht University, 6200 MD Maastricht, The Netherlands; and 2 Center for Human Nutrition, Department of Medicine, University of Colorado Health Sciences Center, Denver, Colorado 80262
We assessed
the extent to which a possible synchronization between transient blood
glucose declines and spontaneous meal initiation would lend support to
the interpretation of a preload study with isoenergetic (1 MJ)
isovolumetric high-fat or simple carbohydrate (CHO) preload drinks. Ten
men (18-30 yr) fasted overnight and then were time blinded and
made aware that they could request meals anytime. At first meal
requests, volunteers consumed a preload; ad libitum meals were offered
at subsequent requests. Postabsorptively, transient declines in blood
glucose were associated with meal requests
(
2 = 8.29). Subsequent meal
requests occurred during "dynamic declines" in blood glucose
after the peak induced by drink consumption (100%). These meal
requests took twice as long to occur after high-fat than after CHO
preloads (fat = 126 ± 21, CHO = 65 ± 15 min), consistent with
differences in interpolated 65-min satiety scores (fat = 38 ± 8.2, CHO = 16 ± 4). Postprandially, transient blood glucose declines
were associated with meal requests
(
2 = 4.30). Spontaneous meal
initiations were synchronized with transient and dynamic blood glucose
declines. Synchronization of intermeal interval and dynamic declines
related to higher satiating efficiency from high-fat preloads than from
simple CHO preloads.
glucostatic theory; food intake regulation; intermeal interval; satiety; hunger
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