Food is fuel for the brain, which consumes 20% of the body’s total energy, even though it accounts for only 2% of the body’s mass. A student who eats poorly is like a car without petrol: it doesn’t work. But not all students eat the same way, and there are special diets tailored to meet specific needs due to health reasons, beliefs or situations requiring high intellectual effort. Host families are prepared for these diets; not only are they aware of the restrictions, but they adapt with care to ensure the student feels at home. Before the student arrives, the family receives a detailed report on whether they are coeliac, vegan or have severe allergies.