In regards to "value" for food, let's consider beyond a certain universal unit of sustenance. For example, imagine two pieces of fish that are identical in size, nutrition etc... However, one was simply grilled by a fisherman, while another was "expertly" prepared by a specialized chef. The latter costs 10 times as much. This extra cost is the social value that is being added to the food.

Basically, the value associated with the fundamental nutritional benefit of food is objective and is something everyone can agree on. If this value is the only thing we cared about, the world would not be organized in the capitalist structure that it is today. Everyone would fish and equally distribute the produce. However, we as a species are hardwired to compete, to be "better". All capital is derived from "social-value-signaling".