Increasing the consumption of the following foods can thicken stool and decrease diarrhea:
Fruits: bananas, applesauce
Breads and Starches: oatmeal, rice, pasta, potatoes, pretzels
Proteins: peanut butter, cheese (especially cheddar)
Miscellaneous: jello, boiled milk, cornmeal (used in foods such as corn chips or cornbread), tapioca, marshmallows, and Archway brand coconut macaroons!
Not all of these foods work for everyone (i.e. milk products aren’t recommended for those who are lactose intolerant), but it may be worth a try!