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The hypothalamus is a vital control center in the brain. When this area is damaged, which may occur  due to a brain tumor or its treatment, children may experience a wide range of symptoms: extreme hunger, weight gain, hormonal imbalances, behavioral issues, sleep disturbances, or even severe underweight. This condition is known as hypothalamic dysfunction.

In my research, I explored how these symptoms develop, how we can diagnose them earlier, and most importantly, how to better support affected children. My journey started by surveying patients and parents across the world. Their message was clear: there is an urgent need for tailored dietary and lifestyle guidance and psychosocial support.
We reviewed existing evidence on dietary and lifestyle interventions for children with hypothalamic obesity. Next to this, we developed the “HAPPYthalamus” app, a mobile tool designed to act as a continuous lifestyle companion, motivating children to move, make healthy choices, and manage hunger through distraction and rewards.
Finally, we showed that hypothalamic dysfunction presents in diverse ways. Some children start with severe underweight (diencephalic syndrome), while others develop (rapid) obesity. Growth hormone deficiency may be present, but also elevated levels of IGF-1, as reflection of high levels of GH may be present. Hypothalamic dysfunction may even present with different symptoms and disease courses in children with the same kind of brain tumors.
The takeaway: hypothalamic dysfunction is not a single disease. Even so, for all children with hypothalamic dysfunction the cornerstone of treatment is the same: long-term personalized care (attention to each child’s unique presentation), integrating dietary and lifestyle support.