Question about tongue piercing...?

I got my tongue pierced on the thursday the 7th and it is now sunday the 12th. The piercer told me to stay away from solid foods for a while but I was out shopping with family and I was hungry so I ate a burrito from taco bell.. (it has never taken me so long to eat lol). My question is.. WHY DO THEY TELL YOU NOT TO EAT SOLID FOODS? Is there a reason or is it just because it hurts like a b***h? Does it mess up the healing process? Oh but I do use mouthwash after everything I eat or drink other than ice chips or water.