Some Christians (at least roman-catholic) celebrate communion, consuming ‘bread’ and wine that has been blessed. According to them the bread and wine literally become body and blood of Christ. That’s the joke of the comic :)

‘Processed food’ usually refers to industrial processes often requiring different ingredients or production stepa compared to homecooked

Eg. Homecooked soup Vs. Instant package soup.

Both are soup, but homecook has usually less salt, less sugar, less preservatives, kcal and shorter cooking times for the ingredients.

That’s why ‘avoid processes food’ is such common advice.

Are you purposefully misunderstanding that comment?