There is no clear proof that excessive eating of papaya change the colour of stool like orange. There are some other fruits like berries which might change stool colour If you consume excess beta-carotene from supplements or produce, such as carrots, sweet potato, squash, some leafy greens, and some herbs, then your stool can appear orange. Yellow/Pale Brown/Grey: Bright yellow diarrhea can signify a condition known as Giardiasis.