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. 2021 Jun 9;13(6):1978. doi: 10.3390/nu13061978

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Taxonomy of available portion control tools (compiled by the authors from various sources; see text and Supplementary Table S1). Pictures of calibrated tableware, portion control pots and hands poster kindly shared by Precise Portions NLS [16], TheDietPlate.com [79], GreatIdeasInNutrition.com [80], Rosemary Conley En-terprises [15] and Flexible Dieting Lifestyles LLC [81] respectively. Picture of ServAR tablet application from [68]. We have sought to obtain permission to reproduce published images from all providers.