Another prominent voice in the field at the same time was Caroline Walker Bynum, whose 1988 Holy Feast and Holy Fast became a landmark study.[6] Both Bynum and Porter noted that during the 1980s Western history of the body research drew on post-structuralist thought, such as Michel Foucault's ideas of biopolitics and biopower, which emphasised that state power is not abstract, but exercised through and over human bodies. But both expressed a concern that research was focusing too much on discourse about bodies, rather than on material bodies themselves.