We could go lower, and have in the past. We now are looking at the long term "big picture" of the impact of our food choices on health/medical expenses. We spend around $450 monthly on just food now for a family of 3 adults. We could reduce that but it means going back to eating in an unhealthy way. We used to eat a lot of cheap foods--boxed hb helper, mac n cheese, ramen noodles, canned soups, spagettios, etc. etc. etc. Money savers in the short term but have a negative health impact for most follks over the long term.
We like to think it is a trade off for us--what we now spend monthly for food-->we will reap the savings in health care down the road.
Over the course of 3 years we have changed our outlook entirely. We spend more to purchase locally from farmers: beef, chicken, pork, butter, cheese, milk. We grow a lot of produce and buy locally grown produce and fruit as much as possible. This has raised our overall food budget but we know where the food comes from, how it is raised/produced (pesticides, herbicides, hormones, antibiotics, etc.) ;we have made a commitment to supporting our own future health and the local economy here.
Sometimes, it isn't about how little one spends but the quality/impact of the choices.
ALL THAT SAID--our real savings have been coming from the cutback in purchasing household products and multiple toiltry items, and buying cat food/litter in bulk from the grain elevator farm store.