Poor nutritional choices and unhealthy behaviors are considered responsible for the rise in childhood overweight and obesity and may reinforce each other, creating a vicious cycle. This paper studies a primary school intervention designed to break the cycle early in life by replacing date bars with calorie-equivalent meals lower in sugar and fat. Leveraging the randomized pilot of a menu change in Jordan's national school feeding program, the study shows that children consuming the alternative meals spend 8 percent less money to buy processed snacks, are more physically active (0.1 standard deviation), and go to school one extra day per year.