Table 2.

Item pool (RED-13)

Item	Origin	Subscale
I feel out of control in the presence of delicious food	RED1	LOC
* When I starteating, I just can’t seem to stop	RED2	LOC
If it difficult for me to leave food on my plate	RED3	LOC
* When it comes to foods I love, I have no willpower	RED4	LOC
I get so hungry that my stomach often feels like a bottomless pit	RED5	LOS
* I don’t get full easily	RED6	LOS
It seems like most of my waking hours are preoccupied by thoughts about eating or not eating	RED7	PWF
* I have days when I can’t seem to think about anything else but food	RED8	PWF
*Food is always on my mind	RED9	PWF
I feel hungry all the time	TFEQ39	LOS
I find myself continuing to consume certain foods even though I am no longer hungry	YFAS2	LOC
I can’t stop thinking about eating no matter how hard I try	FCQTR10	PWF
If food tastes good to me, I eat more than usual	DEBQ2	LOC

^*Note. Item in final RED-X5. RED = Reward-based Eating Drive scale; TFEQ = Three Factor Eating Questionnaire; YFAS = Yale Food Addiction Scale; FCQT = Food Craving Questionnaire, Trait, Reduced; DEBQ = Dutch Eating Behavior Questionnaire; LOC = Loss of control; PWF = Preoccupation with food; LOS = Lack of satiety. The RED-X5 questionnaire can be freely used when attributed to.