Journal Articles
Permanent URI for this collectionhttps://mro.massey.ac.nz/handle/10179/7915
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Item Study Protocol for a Randomized Controlled Trial Investigating the Effects of the Daily Consumption of Ruminant Milk on Digestive Comfort and Nutrition in Older Women: The YUMMI Study.(MDPI (Basel, Switzerland), 2024-12-06) Ong SP; Miller JC; McNabb WC; Gearry RB; Ware LM; Mullaney JA; Fraser K; Hort J; Bayer SB; Frampton CMA; Roy NC; Miranda JMBACKGROUND: Age-related changes can lead to dietary insufficiency in older adults. The inclusion of high-quality, nutrient-dense foods such as ruminant milks can significantly improve health outcomes. However, many older adults worldwide do not meet daily milk intake recommendations because of digestive discomfort and health concerns. Ovine and caprine milks are increasingly popular for their perceived digestive and nutritional benefits. While preclinical studies suggest differences in milk digestion, human studies investigating acute postprandial responses remain inconclusive, and the impacts of sustained milk consumption remain uncertain. OBJECTIVES: Hence, we present a randomized controlled trial investigating how the sustained consumption of bovine, caprine, or ovine milk influences digestion, nutrition, and metabolism in older women. METHODS: A total of 165 healthy older women were randomized to receive bovine, caprine, or ovine milk, or no milk, twice daily for 12 weeks. The primary outcome is the impact of milk consumption on digestive comfort assessed via the Gastrointestinal Syndrome Rating Scale (GSRS). Secondary outcomes include changes in nutrient intake, plasma amino acid and lipid appearance, bowel habits, the gut microbiota, cardiometabolic health, physical function, physical activity, sleep, mood, sensory perception, and emotional response. CONCLUSIONS: The findings could inform dietary recommendations for older women and facilitate the development of targeted functional food products.Item Evaluating front-of-pack voluntary well-being messaging for milk powders targeting Chinese older adults: A hedonic price model(Elsevier Inc and Fass Inc on behalf of the American Dairy Science Association, 2023-12) Chen A; Moradi S; Hort JThis study examines the price structure of milk powders targeting Chinese older adults, with special emphasis on the assessment of front-of-pack (FOP) voluntary well-being messaging (VWM), using a hedonic price model. Data of 456 sets of product prices and attributes were collected from official stores at online shops, TMALL.com and JD.com, in China. Prices were recorded 10 d before, during, and 10 d after a major online promotion event (November 11, 2021). A hedonic price model was employed to decompose explicit market prices into individual product attributes implicit prices, including essential attributes, such as milk source, brand origin, package material, and nutritional composition, and nonessential attributes conveyed by FOP VWM, regarding nutrition, ingredients, health, sensory qualities, and certification. Results showed that above and beyond essential attributes, nonessential attributes conveyed by FOP VWM were significantly associated with price. Specifically, significant price premiums were associated with dietary fiber claims (+12.7%), no added sugar (+19.0%) and potential health benefits (+19.3%), as nutrition-, ingredient-, and health-related FOP VWM respectively. However, nutrition claims regarding calcium and fat were negatively associated with price (-21.2% and -8.0%, respectively, when they were presented). Additionally, nutrition claims for protein and vitamin D, introducing farm environment, referring to imported ingredients, declaring specific ingredients added, describing sensory characterizes and providing certificates on FOP were not significantly associated with price in this market. These findings provide manufacturers with information to better differentiate their products by producing and advertising attributes most valued by consumers.Item The impact of heat-set milk protein gel textures modified by pH on circulating amino acid appearance and gastric function in healthy female adults: a randomised controlled trial.(Royal Society of Chemistry, 2024-05-21) Milan AM; Menting GGA; Barnett MPG; Liu Y; McNabb WC; Roy NC; Hutchings SC; Mungure T; Weeks M; Li S; Hort J; Calder S; O'Grady G; Mithen RFModification of dairy proteins during processing impacts structural assemblies, influencing textural and nutritional properties of dairy products, and release and availability of amino acids during digestion. By modifying only pH, acid heat-set bovine dairy gels with divergent textural properties were developed to alter protein digestion. In vitro assay confirmed faster digestion of protein from a firm gel (pH 5.65) versus a soft gel (pH 6.55). We hypothesised that firm gel (FIRM-G; pH 5.6) would result in greater indispensable amino acid (IAA) appearance in circulation over 5 h and corresponding differences in gastric myoelectrical activity relative to soft gel (SOFT-G; pH 6.2). In a randomised, single-blind cross-over trial, healthy females (n = 20) consumed 150 g of each gel; plasma amino acid appearance was assessed over 5 hours. Iso-nitrogenous, iso-caloric gels were prepared from identical mixtures of bovine milk and whey protein concentrates; providing 17.7 g (FIRM-G) and 18.9 g (SOFT-G) of protein per serving. Secondary outcomes included gastric myoelectrical activity measured by body surface gastric mapping, glycaemic, triglyceridaemic, and subjective appetite and digestive responses. Overall plasma IAA (area under the curve) did not differ between gels. However, plasma IAA concentrations were higher, and increased more rapidly over time after SOFT-G compared with FIRM-G (1455 ± 53 versus 1350 ± 62 μmol L-1 at 30 min, p = 0.024). Similarly, total, branched-chain and dispensable amino acids were higher at 30 min with SOFT-G than FIRM-G (total: 3939 ± 97 versus 3702 ± 127 μmol L-1, p = 0.014; branched-chain: 677 ± 30 versus 619 ± 34 μmol L-1, p = 0.047; dispensable: 2334 ± 53 versus 2210 ± 76 μmol L-1, p = 0.032). All other measured parameters were similar between gels. Peak postprandial aminoacidaemia was higher and faster following ingestion of SOFT-G. Customised plasma amino acid appearance from dairy is achievable by altering gel coagulum structure using pH during processing and may have minimal influence on related postprandial responses, with implications for targeting food design for optimal health. The Clinical Trial Registry number is ACTRN12622001418763 (https://www.anzctr.org.au) registered November 7, 2022.Item Older Chinese adults' milk consumption habits: A study across 5 cities(Elsevier Inc. on behalf of the American Dairy Science Association, 2024-06) Chen A; Moradi S; Huang J; Xu S; Sismey M; Hort JMilk consumption in China has experienced a rapid growth over the past few decades. This study explored milk consumption habits of older Chinese adult regular milk consumers, by investigating what, where, when, with whom, why, and how milk was consumed. This study (n = 1,000) was conducted in 5 cities in China (first tier: Beijing, Shanghai and Guangzhou; second tier: Chengdu and Shenyang) with participants balanced by sex and age groups (45-55 and 65-75 yr old). Given different economies, general dietary habits, and lifestyles, differences in milk consumption habits between cities were hypothesized. The results showed that almost all participants consumed cow milk, at home and by direct drinking. Most participants consumed milk during breakfast, with their family and for nutrition and health purposes. However, variations by city were found in what type of, what fat level of, what brand of, when and how milk was consumed. Multiple factor analysis showed that "what" variable differentiated cities between tiers and among the first-tier cities, and that "when" and "how" variables also separated the 2 second-tier cities and from the first-tier cities. Although variation in how milk was consumed was also observed between sexes and age groups, hierarchical cluster analysis revealed that the 4 clusters of milk consumption habits derived were mainly differentiated by city: Beijing and Shanghai, Guangzhou, Chengdu, and Shenyang. This study provides comprehensive insights into the milk consumption habits of older Chinese adults and highlights the significant heterogeneity in milk consumption habits in China by city.