(in particular that he essentially ignores things like caring about organic food or vegetarianism which fit classic food taboo forms)

He does mention those. E.g. The Righteous Mind, page 254:

The Sanctity foundation is used most heavily by the religious right, but it is also used on the spiritual left. You can see the foundation’s original impurity-avoidance function in New Age grocery stores, where you’ll find a variety of products that promise to cleanse you of “toxins.” And you’ll find the Sanctity foundation underlying some of the moral passions of the environmental movement. Many environmentalists revile industrialism, capitalism, and automobiles not just for the physical pollution they create but also for a more symbolic kind of pollution—a degradation of nature, and of humanity’s original nature, before it was corrupted by industrial capitalism.