I was part of a project that did some work in this area also, we developed a machine learning based wearable to detect chewing: https://www.ah-lab.cs.dartmouth

I was part of a project that did some work in this area also, we developed a machine learning based wearable to detect chewing: https://www.ah-lab.cs.dartmouth.edu/publications/detecting-eating-episodes-ear-mounted-sensor https://www.ah-lab.cs.dartmouth.edu/publications/detecting-e...