“…Changes in fat mass requirements depend on age and sex and are related to fat mass function ( Forbes, 1999 ; Guo et al, 1999 ; Hughes et al, 2001 ; Bergman et al, 2011 ; Kuen-Chang et al, 2011 ; Mialich et al, 2014 ; Gryko et al, 2019 ). As the BMI classification used to date does not take into account differences in sex, age, and body composition, researchers are attempting to use other methods based on anthropometric measurements (Sheldon typology and Stunkard figure rating scale), skinfolds (Szczawińska MT index), circumferential measurements, or using BAI or combined Mialich BMI fat methods ( Heath and Carter, 1967 ; Slaughter et al, 1988 ; Bergman et al, 2011 ; Mialich et al, 2011 ; Burdukiewicz et al, 2015 ; Chwałczyńska, 2017 ; Lønnebotn et al, 2018 ; Gryko et al, 2019 ; Karpik et al, 2020 ; Vallieres et al, 2020 ; Chwałczyńska and Andrzejewski, 2021 ). However, all of these indices require a combination of at least two measurement methods, including peripheral skinfold measurements, which require considerable skill and precision of measurement, as well as equipment, and cannot be used in primary care because the primary care physician or nurse does not have enough time during the visit to take such measurements, and very often the skills.…”