When you were young, you probably felt like you could eat or drink pretty much anything. But as you age, your stomach becomes more sensitive to certain kinds of foods and beverages. Take V8 fusion drinks, for instance; the fructose in the drinks could be leaving you with the runs.
According to Harvard Health Publishing, diarrhea is a common effect when you drink more than 40 to 80 grams of fructose (sugars that naturally occur in fruit juices); you may also experience this after consuming sugar substitutes. My Food Data notes that V8 V-Fusion Juices Tropical contains 25 grams of sugar in an 8-ounce serving, most of which comes from the fruit juices. Most bottles have at least 16 ounces; therefore, one bottle would contain a whopping 50 grams of sugar. Per Harvard, the reason you’re running to the bathroom is due to the surge of electrolytes and water released from the intestines by the absorption of the sugars.
Diarrhea can be even worse for those with gastrointestinal issues like irritable bowel syndrome, according to Johns Hopkins Medicine. When fruits high in fructose enter the gut, they can be treated like undigested lactose, which can cause gas, nausea, cramps, and bloating.