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  • Title: Effect of in vitro food oral coating and lubricity on satiety: A randomized controlled trial using milk protein beverages.
    Author: Stribițcaia E, Gibbons C, Finlayson G, You KM, Araiza-Calahorra A, Hafiz MS, Ellis LR, Boesch C, Sier JH, Blundell J, Sarkar A.
    Journal: Physiol Behav; 2024 Dec 01; 287():114690. PubMed ID: 39251153.
    Abstract:
    We investigated the effects of complex textural attributes of food i.e. lubricity and oral coating, on appetite ratings, food intake, salivary and gut peptides for the first time. Milk protein-rich beverages (whey and casein) were instrumentally analyzed (tribology, viscosity and adsorption, latter representing oral coating) using in vitro measurements. Then these protein beverage preloads differing in their coating properties (low coating, medium coating and high coating) were assessed in two cross-over satiety trials (Study 1, n=37; Study 2, n=15; Total n= 52). Fullness ratings increased in the high coating beverage condition (p < .05) only after 20 min with limited effects on other time points, suggesting a sporadic effect of oral coating on appetite ratings (n=37). There was a correlation between concentration of protein in saliva and appetite ratings; the higher the concentration of protein in saliva the lower the desire to eat (r = - 0.963; p < 0.05) and prospective food consumption ratings (r =- 0.980; p < 0.05). Human saliva was more lubricating after ingesting preload with high coating properties, thus explaining the results on appetite ratings. There was no effect of oral coating on energy intake and gut peptides (n=15), suggesting that complex textural attributes having influence on oral processing might not have any effect on the later parts of the satiety cascade. Oral coating/ lubricity appears to have a subtle and sporadic effect on appetite suppression, which needs further investigation with changing macronutrients/energy load and degree of coating/ lubricity.
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