Can pepsi max cause diaherre if drank all day?

Yes: The caffeine as well as the liquid volume can cause GI upset and diarrhea. It is also bad for several other reasons. Cut back to 1 or two small glasses per day, and drink water the rest of the time. Hope this helps!

Yes: Diet Pepsi Classic Sweetener Blend is made with aspartame. Diet Pepsi is made with sucralose (Splenda), Pepsi Zero Sugar (previously known as Diet Pepsi Max & Pepsi Max is sweetened with aspartame. Diarrhea is a possible side effect of aspartame & Sucralose. REF: http://www.livestrong.com/article/450435-diet-soda-diarrhea/