FTO and obesity due to melanocortin 4 receptor deficiency: A recent systematic review and meta‐analysis of trials on the association of the FTO genotype with the response to lifestyle interventions analysed 13 studies with 3980 children with overweight and obesity and found that the FTO risk allele had no association with changes in BMI Z‐score, BMI, waist circumference, waist‐to‐hip ratio or body fat percentage after lifestyle interventions.