Journal editors love it when they simultaneously receive two studies addressing the same problem which give contradictory results. When the subject is obesity prevention, for which a myriad of negative studies are submitted, and one shows a possible positive effect, the excitement in the editorial office is even greater. JAMA published together two American randomised trials of community-based early interventions. The first, from a deprived area of Nashville, Tennessee, randomised 600 children aged 3 to 5 years already at risk of obesity (Barkin S et al . doi:10.1001/jama.2018.9128). The intervention families received 12 weekly parenting skills-building sessions, followed by monthly phone calls, for a year. The controls received a school-readiness intervention only. After 3 years, although they ate slightly fewer calories, their BMIs did not differ from controls (mean 17.8 kg/m2 for both groups). The second, from a more prosperous population in Pennsylvania, recruited 300 young infa...