“…Notably, restriction of many individual amino acids, including methionine, leucine, isoleucine, histidine, threonine, tryptophan, and valine as well as simultaneous restriction of the three BCAAs, have been associated with increased energy expenditure, at least in C57BL/6J males, but not all of these restrictions induce the FGF21-UCP1 thermogenic axis in iWAT (Cummings et al, 2018; Flores et al, 2022; Fontana et al ., 2016; Forney et al, 2020; Lees et al, 2017; Yap et al, 2020; Yu et al ., 2021). Similarly, in HET3 mice fed either the Low AA or Low Ile diets, there is not a clear upregulation of iWAT Ucp1 in males and no change in females.…”