This paper examines the effectiveness of public policies aimed at promoting healthy eating within the home environment to prevent diet-related health diseases that could be the consequences of childhood obesity or overweight. We theoretically study the effectiveness of standard policies such as taxation of unhealthy good and the use of nudge in a framework where parents have misperceptions about the effects of food consumption on their children’s future health. We find that due to parents’ misperception of the long-term consequences of their consumption patterns on their children’s future health, the individual choice solution is nonoptimal. We show that a simple policy of taxing the consumption of unhealthy good is only second-best. We also find that nudge does not guarantee the possibility of reaching the first-best optimum. Moreover, we find that the mixed policy allows the tax to be set at its lowest level to achieve at least the socially optimal levels of healthy and unhealthy family consumption.