The objective of this article is to discuss the development of statistical and probabilistic reasoning in childhood as a result of an interdisciplinary project, involving the fields of mathematics, statistics, and life sciences. This is a case study with three 10-year-old students from a Brazilian school. The children's oral and written narratives are used as a methodological path. It is an investigation process that examines human actions and considers social practices, subjective experience, identity, beliefs, emotions, values, context, and complexity. The results show that an interdisciplinary study involving life sciences, mathematics and statistics promoted the development of statistical and probabilistic reasoning, appropriate to the age group, enabling the children to positively rescale their eating habits.