Probably true as far as growing your own goes, but bulk dry food like pasta and beans lasts long enough that you can buy in bulk even for one person. Of course

Probably true as far as growing your own goes, but bulk dry food like pasta and beans lasts long enough that you can buy in bulk even for one person. Of course, you can't amortise the labour of cooking over as many people, so it may still make sense to get the ready meals from that perspective.