In Primary there's usually a connection where when there's good tech prices food goes higher because of stocking. I don't think that really exists in Express usually but maybe this time?
I dont think it's the case in Express. Food is more unstable when there are big cashers stocking IMO. Indies aren't big on food. Don't know about techers though. I stock food, but I know some people who switch to some form of MBR and don't bother with food, but resell instead.
Food's high now... but will it be high tomorrow? Don't know.