When I was three, my mum says that I went through a phase of eating nothing but Jelly & Ice Cream for every meal.... & I wouldnt eat anything else.
She ended up taking me to the doctor cos she was worried about it & he laughed at her and told her to let me eat whatever I wanted, cos at least I was eating. I grew out of it after a few months, but I cant even look at Jelly & Ice Cream together now.