Like ALKBH5, the primary function of FTO appears to be oxidation of m6A in mRNA, although FTO, the overexpression of which is closely linked to obesity and diabetes,233, 234, 235 also oxidizes the methyl groups of 3‐methylthymine (m3T) and 3‐methyluracil (m3U) in ssDNA.236. This evidence concerns the gene FTO and obesity disorder.