Black tea

Similar to green tea, black tea has a number of health advantages, including the ability to calm an upset stomach. It could be particularly useful for treating diarrhea. In fact, consuming a black tea capsule improved the volume, frequency, and regularity of bowel movements in a trial involving 120 kids.

According to 27-day research, administering black tea extract to pigs with E. coli infections decreased the incidence of diarrhea by 20%. Even though the majority of study focuses on supplements, drinking tea may still help relieve gastrointestinal issues. However, it's advised to keep your consumption to 1-2 cups (240-475 ml) each day as too much of its caffeine may irritate your stomach.