Final answer:
The author points out a weakness in the argument that restaurants and grocery stores are solely to blame for food waste by emphasizing the role of consumer demand and expectations.
Step-by-step explanation:
In the given text, the author points out a weakness in the argument that restaurants and grocery stores are to blame for food waste by highlighting the role of consumer demand and expectations. The author mentions that consumers expect ready availability of the foods they desire, regardless of health implications or sustainability of sources. This implies that the demand for certain types of foods, regardless of their impacts, influences the choices made by restaurants and grocery stores. By focusing on consumer behavior and choices, the author suggests that the responsibility for food waste is shared between the supply side (restaurants and grocery stores) and the demand side (consumers).