Adelaide Medical School and Centre of Research Excellence in Translating Nutritional Science to Good Health, The University of Adelaide, Adelaide, Royal Adelaide Hospital, Adelaide, SA 5000, South-Australia, Australia.
Riddet Institute, Massey University, Palmerston North 9430, New Zealand.
Nutrients. 2020 Oct 29;12(11):3318. doi: 10.3390/nu12113318.
Ageing is associated with changes in feeding behavior. We have reported that there is suppression of energy intake three hours after whey protein drink ingestion in young, but not older, men. This study aimed to determine these effects over a time period of 9 h. Fifteen younger (27 ± 1 years, 25.8 ± 0.7 kg/m) and 15 older (75 ± 2 years, 26.6 ± 0.8 kg/m) healthy men were studied on three occasions on which they received, in a randomized order, a 30 g/120 kcal, 70 g/280 kcal whey-protein, or control (2 kcal) drink. Ad-libitum energy intake (sum of breakfast, lunch, and dinner) was suppressed in a protein load responsive fashion ( = 0.001). Suppression was minimal at breakfast, substantial at lunch (-16%, = 0.001), no longer present by dinner, and was less in older than younger men (-3 ± 4% vs. -8 ± 4%, = 0.027). Cumulative protein intake was increased in the younger and older men (+20% and +42%, < 0.001). Visual analogue scale ratings of fullness were higher and desire to eat and prospective food consumption were lower after protein vs. control, and these effects were smaller in older vs. younger men (interaction effect < 0.05). These findings support the use of whey-protein drink supplements in older people who aim to increase their protein intake without decreasing their overall energy intake.
衰老是与摄食行为的变化相关的。我们曾报道过，在年轻人中，摄入乳清蛋白饮料 3 小时后能量摄入会受到抑制，但在老年人中则不会。本研究旨在确定在 9 小时的时间内是否会产生这些影响。我们在三个不同的时间点对 15 名年轻男性（27 ± 1 岁，25.8 ± 0.7 kg/m）和 15 名老年男性（75 ± 2 岁，26.6 ± 0.8 kg/m）进行了研究，他们以随机顺序接受了 30 g/120 kcal、70 g/280 kcal 的乳清蛋白或对照（2 kcal）饮料。随意能量摄入（早餐、午餐和晚餐的总和）呈蛋白质负荷反应性抑制（ = 0.001）。这种抑制在早餐时最小，在午餐时显著（-16%， = 0.001），晚餐时不再存在，而且在老年男性中比年轻男性更轻（-3 ± 4%对-8 ± 4%， = 0.027）。年轻男性和老年男性的累积蛋白质摄入量均增加（分别增加 20%和 42%， < 0.001）。与对照相比，摄入蛋白后饱腹感的视觉模拟评分更高，食欲和预期食物消费更低，而且这些效果在老年男性中比年轻男性更小（交互作用效应 < 0.05）。这些发现支持在试图增加蛋白质摄入而不减少总能量摄入的老年人中使用乳清蛋白饮料补充剂。
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