You can eat pizza equally well while working with leaded solder. While regulated (and monitored to some extent), all food, drinks and drinking water contain some lead. FDA says daily maximum intake for an adult to 12.5 µg/day. There is no way handling the metallic solder with your hands, then touching food with the hands unwashed would cause material to transfer in this amount. With solder paste, I would be much more careful.
OTOH, if you are concerned about health effects, you should be really paying attention to the flux used in the solder. There are differences, and anecdotal comments always mention lead-free solder containing a more harmful flux. Whether this is actually true or not, I don't know, but it's worth spending your investigative time and energy on if you are concerned about health (which is obviously a good idea).