The FTO protein is an Alk‐B like DNA/RNA demethylase, FTO knock‐out mice survive until adulthood stages and exhibit no differential weight changes when compared to wild‐type mice, suggesting that alterations in protein structure do not indicate a risk of obesity (Han et al., 2010; Ronkainen et al., 2015; Stratigopoulos et al., 2008). Here, FTO is linked to obesity due to melanocortin 4 receptor deficiency.