Hello and welcome to HealingWell.
I would suspect the coffee/caffeine too - you have received great input from the members.
Antacids can cause your stools to be pale as well as other medications and conditions. If there is no medicinal reason for your stools to be pale to white or it persists for multiple bowel movements, seek medical care.
Try not to let your health anxiety take over and perhaps with cutting out the caffeine, decreasing your stress and watching your diet all will be fine quickly.
Kindly,
Kitt