Research Proven Effectiveness : Clinical Trial Data - Proof Positive! “ studies show that Precise Portions® tools are effective in significantly reducing the self-selected portion sizes for unhealthy food (chips and potatoes) while increasing it for healthy ones (raw and cooked vegetables). “ Clinical Trial Data by Volume 116, Issue 11 December 2016, pp. 1974-1983 Source: https://www.cambridge.org/core/journals/british-journal-of-nutrition/article/div-classtitleacceptability-and-potential-effectiveness-of-commercial-portion-control-tools-amongst-people-with-obesitydiv/1EE7393072C13C96CB8B66B90D61AEC4#fndtn-information