Because of the importance of providing the appropriate fluid consistency for effective management of swallowing problems (dysphagia) in infants, this project sought to determine the effect of three commercially available thickening agents on the resulting thickened consistencies of commonly prescribed, ready-to-feed infant formulas. Nine ready-to-feed infant formulas were thickened with three different thickening agents to nectar and honey consistencies following manufacturer's instructions and their resulting thickness was measured via line spread test (LST). The nine formulas with nothing added to them (thin liquids) and the 27 target-nectar and 27 target-honey samples together created 63 unique samples for comparison. A series of one-way analysis of variance analyses were conducted to determine if the resulting thickness (as measured by LST values) for target categories of nectar and honey consistencies was significantly influenced by the type of thickening agent used. The achieved thickness of the formula samples as measured by LST values was statistically significantly different for the three different types of thickening agents used to achieve a target nectar consistency, F (2, 24) = 15.55, p < .001, ηp2 = .709. Additionally, the achieved thickness of the formula samples was statistically significantly different for the three different types of thickening agents used to achieve a target honey consistency, F (2, 24) = 16.18, p < .001, ηp2 = .709. The results of this study reveal that the choice of thickening agent impacts the resulting thickness of ready-to-feed infant formula.

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