What evidence made scientists conclude that Ötzi the Iceman had been in contact with agricultural communities that had used food processing techniques?

Otzi, the mummified man was a big discovery in 1991 in the Italian alps that reveals many information about the science.

Dead body of otzi provide his DNA samples that reveals a lot about his migration and settlement patterns. So, his DNA resembled the DNA of the farmers of Bulgaria and Sweden and it is found that just before his death he ate bread and fruit, so he must know food processing techniques.

this protocol provides a detailed procedure for agarose-based ip to purify and enrich the protein of interest.