I'm doing some personal research regarding fast food availability and obesity rates throughout history. If you could steer me towards any sources I can use, it would be much appreciated!!
You might find these older answers helpful:
How did common Romans eat?, Did the ancient Romans really only eat one meal a day?, How was Roman street food served and eaten given that disposable materials were much less available?, What kinds of street food would of been available in Ancient Rome? and Living as a non-wealthy person in ancient Rome how confident could I be that I would not starve as long as I had a trade? by /u/XenophontheAthenian
I'm sitting here eating chips. Did the people of the Roman empire have an equivalent of such snack foods? by /u/samadhii