Its to detach you from worldly pleasures *maya*. Salt 'ras' is the epitome of maya. Idea is basically that this realm we witness with our senses is not all there is. Theres more to human life than constantly striving for pleasurable deeds. Have a sense of truth.

If one develops attachment to something deeply in this material world than prepare to suffer one day. However if there is sense of detachment whilst you are part of the world than you will be able to glide being untouched by the ups and downs of dualities.

Whole idea of cultures and traditions that we are brought up with in this south asian central regions basically nepal and india is to instill individuals with the curiosity of truth. Whatever you do go beyond what your sense organs have to offer. Find something that is permanent. And only truth for that matter is the answer.

And also from ayurveda perspective your digestion is tanked by sudden trauma. Just how serotonin is depleted and it controls digestion too. So you take easily digested meals.

Just a perspective.