Table 5: Themes from open ended questions.

Categories	Theme	Example
Most helpful aspect of the study	Increases in self-awareness	“The fact that I was more aware of the behavior seemed to help reduce it.”
	Monitoring of eating patterns and/or health	“Test results and checkup results were helpful in monitoring my health.”
	Confirmation of BED diagnosis	“Confirming my disordered eating.”
	Changes in health behaviors	“Reducing binges.”
Non-useful or annoying aspects of the study	Procedural challenges	“Long blood draws”
	No aspects	“Nothing”
Suggested changes or additions to the study	More psychoeducation/treatment information	“…interesting information on binge eating and chromium”
	Procedural changes	“More recalls or journal”
	No additions	“Nothing”
Additional comment	Satisfied	“Satisfied with the outcome, glad I chose to be a part of the trial.”