Of the three snakes we have... only two can we actually 'tell' when they are in shed. The bananna albino bullsnake, we can never tell when he's about to shed except to watch the dryness (not colour) of his scales, as his eyes never go blue.
My ball doesn't like to eat when she's in shed. The rock python doesn't care - if it's food, she'll take it no matter WHAT is going on at the time. LOL
So my take? It depends on the individual animals ... some will not eat during shed, others will ... just get to know your snake, and go with what you know of the animal ...
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1 Ball Python
1 Rock Python
1 Bullsnake
5 Cats
Love 'em all ...