{Reference Type}: Journal Article
{Title}: Evaluating the Validity of the PortionSize Smartphone Application for Estimating Dietary Intake in Free-Living Conditions: A Pilot Study.
{Author}: Diktas HE;Lozano CP;Saha S;Broyles ST;Martin CK;Apolzan JW;
{Journal}: J Nutr Educ Behav
{Volume}: 0
{Issue}: 0
{Year}: 2024 Jun 17
{Factor}: 2.822
{DOI}: 10.1016/j.jneb.2024.05.226
{Abstract}: <B>OBJECTIVE: </B>Evaluate the validity of the PortionSize application.<BR><B>METHODS: </B>In this pilot study, 14 adults used PortionSize to record their free-living food intake over 3 consecutive days. Digital photography was the criterion measure, and the main outcomes were estimated intake of food (grams), energy (kilocalories), and food groups. Equivalence tests with ±25% equivalence bounds and Bland-Altman analysis were performed.<BR><B>RESULTS: </B>Estimated gram intake from PortionSize was equivalent (P < 0.001) to digital photography estimates. PortionSize and digital photography estimated energy intake, however, were not equivalent (P = 0.08), with larger estimates from PortionSize. In addition, PortionSize and digital photography were equivalent for vegetable intake (P = 0.01), but PortionSize had larger estimates of fruits, grains, dairy, and protein intake (P >0.07; error range 11% to 23%).<BR><B>CONCLUSIONS: </B>Compared with digital photography, PortionSize accurately estimated food intake and had reasonable error rates for other nutrients; however, it overestimated energy intake, indicating further application improvements are needed for free-living conditions.