The debate continues: does ketchup belong on a hot dog? A Chicagoan consults Danielle Reed, a taste geneticist, to get science to settle the score. However, according to Steven Parnes, an ENT-otolaryngologist (ear, nose and throat doctor), our taste preferences may change as we age.
Hot Dogs: What’s the Right Way to Eat Them, According to Science? – Wired
Why Taste Buds Dull As We Age – NPR: The Salt
scienceandfooducla 
Ketchup one hundred percent does belong on a hotdog. That’s been the case for decades of history of the hotdog