Chewing Food More Thoroughly Results in Reduced Insulin Output (2013)
The title appears to be wrong. Chewing more increases insulin concentration:  Meanwhile, plasma concentrations of glucose (P= 0·024), insulin (P< 0·001) and GIP (P< 0·001) were higher following the forty-chews meal."

Doesn't this suggest that if you want to eat a lot of food but don't want to absorb too much of it (i.e., are concerned about weight gain), you should chew less?