13 doctors weighed in:

Can you get diarrhea from drinking too much diet soda and coffee?

13 doctors weighed in
Dr. Brett Kalmowitz
Internal Medicine - Gastroenterology
9 doctors agree

In brief: Yes

Stimulants and artificial sweeteners can cause diarrhea.
Excess of either coffee or diet soda should be avoided.

In brief: Yes

Stimulants and artificial sweeteners can cause diarrhea.
Excess of either coffee or diet soda should be avoided.
Dr. Brett Kalmowitz
Dr. Brett Kalmowitz
Thank
Dr. Arthur Heller
Internal Medicine - Gastroenterology
5 doctors agree

In brief: Coffee definitely

Coffee (even decaff) contains organic acids that can be irritating to the lining of the gut, and cause diarrhea.
Excess caffeine (even in diet sodas) can as well. Some people are sensitive to fructose as contained in table sugar or high fructose corn syrup (not really hi fructose, but corn syrup is solely glucose). Excess carbonation can stimulate bowels. Artificial sweeteners don't usually cause.

In brief: Coffee definitely

Coffee (even decaff) contains organic acids that can be irritating to the lining of the gut, and cause diarrhea.
Excess caffeine (even in diet sodas) can as well. Some people are sensitive to fructose as contained in table sugar or high fructose corn syrup (not really hi fructose, but corn syrup is solely glucose). Excess carbonation can stimulate bowels. Artificial sweeteners don't usually cause.
Dr. Arthur Heller
Dr. Arthur Heller
Thank
Get help from a real doctor now
Dr. Marsha Davis
Board Certified, Internal Medicine
25 years in practice
67M people helped
Continue
111,000 doctors available
Read more answers from doctors