Other genes therapies investigated for obesity include Follistatin (FST) (Jimenez et al. 2018), Fibroblast growth factor 21 (FGF21) (Lapik et al. 2016), Adipose-derived mesenchymal stem cells (ADMSCs) (Lopez et al. 2023), and CRISPR-Cas9-based gene editing system (Jayachandran et al. 2023). Here, FGF21 is linked to obesity due to melanocortin 4 receptor deficiency.