![]() The protein drink did not affect energy intake at dinner in either age group. Energy intake was measured at breakfast, lunch, and dinner (5 p.m.).Įnergy intake after the drink was suppressed more by whey protein compared to control and suppression of energy intake by the 70 g whey protein compared to control was greatest at lunch. The antral area of the stomach was measured at several time points between the drink and breakfast. ![]() Following consumption of the drink (8.30am), palatability of the drink and perceptions of appetite were assessed by VAS. Subsequently, the drink was served in an opaque cup to ensure that the volunteers were blinded. The drinks were all around 450 mL with different quantities of food-grade unflavoured whey protein isolate (Bulk Nutrients) dissolved in varying amounts of water.īefore having the drink, perceptions of appetite were assessed by visual analogue scales (VAS) and the antral area of the stomach. They attended the lab in the morning and received a single drink of either flavoured water (control ~2 kcal), 30 g whey protein (120 kcal), or 70 g whey protein (280 kcal). On each occasion, they were given a standardised meal the night before, and informed not to drink alcohol or take part in strenuous exercise for 24 hours. The study included 15 healthy younger men (mean age: 27 ± 1 years) and 15 healthy older men (75 ± 2 years).Įach participant was studied on three occasions, separated by ~3–10 days. They conclude: "These findings support the use of whey-protein drink supplements in healthy older patients who aim to increase their protein intake without decreasing their overall energy intake." Methodology In the older group, consumption of 30g whey protein led to 23% increase and 70g whey protein led to 47% increase. Consumption of 30g whey protein led to a 17% increase while 70 g whey protein led to 36% increase in the younger group. ![]() They found that cumulative protein intake was increased when volunteers consumed the protein drinks. They hypothesised that suppression of energy intake by whey protein when compared to control would be less in healthy older than younger adults, resulting in an increase in cumulative energy and protein intake in the older men. The team report that, overall, suppression of energy intake by whey protein was less in healthy older men: −94 ± 82kcal when compared to younger men −169 ± 100 kcal and cumulative protein intake was increased in both groups with the addition of the protein drink. In this study, the team of researchers from Royal Adelaide Hospital, Australia, aimed to characterise the effect of ageing on the suppression of food intake at breakfast, lunch, and dinner over a time period of nine hours by a pre-breakfast whey protein load (30 g and 70 g), compared to a control drink in healthy younger and older men, using a sample size of 30. The researchers of the current study have previously reported that in older adults the acute suppression (up to three hours following ingestion) of energy intake caused by protein supplementation is less than that observed in younger adults, resulting in an increase of overall energy and protein intake in the older adults. Whereas in healthy, younger adults, protein is considered to be the most satiating macronutrient and protein-rich supplements and diets are often recommended as a weight loss strategy in obese, younger individuals. Healthy ageing is associated with a reduction in appetite and food intake, including protein intake, which predisposes older people to loss of body weight and in particular, skeletal muscle mass.Ī common strategy to increase energy intake and body weight in undernourished older people is the use of >25–30 g whey protein-enriched supplements which aim to result in preserved or even increased muscle mass and strength. ![]()
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