Final answer:
Excessive intake of vitamin C can cause diarrhea, as it leads to gastrointestinal disturbances resulting from the body's inability to absorb high doses. It is important to keep vitamin supplementation within recommended limits to avoid health issues like dehydration.
Step-by-step explanation:
Taking megadoses of vitamin C can lead to several adverse effects, one of which is diarrhea. While it is essential to have enough vitamin C to prevent conditions like scurvy, which causes bleeding gums, nosebleeds, and other symptoms, excess intake can be harmful. The body's Tolerable Upper Intake Levels (UL) are established to prevent overconsumption of vitamins and minerals that can be toxic in high doses.
When consumed in excessive amounts, vitamin C can cause gastrointestinal disturbances, including diarrhea, abdominal pain, and in severe cases, nausea and vomiting. These symptoms occur because the intestines cannot absorb excessive amounts of vitamin C, leading to an osmotic effect in the digestive tract that draws water into the intestines, increasing motility and causing loose stools. In some instances, diarrhea can lead to dehydration if not managed properly.
It's crucial to adhere to recommended dosages and to consult with a healthcare provider before taking high doses of micronutrient supplements like vitamin C. Doing so can help prevent the aforementioned side effects and ensure that the supplementation is beneficial rather than detrimental to health.