I feel like this should be obvious, I stopped heating anything in plastic years ago. But, it's very good to get confirmation and wider recognition, of course.

Unfortunately, it's virtually impossible to avoid food that has been processed through plastic machinery, and stored in plastic. You'd literally need to grow your own. Even foods sold in glass or paper containers was processed through industrial machines that include many plastic parts, and stored in-bulk in plastic containers before being packaged in glass for sale.