Often, she says she sees people "swipe a whole shelf of stuff", including fresh meat, milk or baby food, into a rucksack or large reusable bag.
She did not believe that many incidents were due to people going hungry, but rather "organised crime rings" who might be selling food on.
She said there needed to be a "holistic view" of these problems, with input from government, academics and the industry, rather than individually investigating issues such as tax, crime, planning, housing, and environmental policy.