Hi Valentijn, My son loved asparagas until he was about 5 when he noticed the smell for the first time. Suddenly he "hated" it and refused to eat it ever since and he is 27 now. It's something everybody else in the family eats lots of. Onions, garlick, fish and all sorts of things affect the smell of urine. Kids can be funny. However, once the decide something like that it often sticks and they forget why they "hated" it.