Final answer:
Excessive intake of vitamin A can cause symptoms of toxicity such as nausea, vomiting, and headache, as well as more severe conditions like liver issues and visual problems.
Step-by-step explanation:
Consuming excessive amounts of vitamin A can lead to symptoms like nausea, vomiting, and headache, which are indicative of vitamin A toxicity, also known as hypervitaminosis A. Hypervitaminosis A can also cause more serious issues such as liver damage, blurred vision, hair loss, and skin rash. Since vitamin A is fat-soluble, it can accumulate to toxic levels in the body if taken in large doses over time. It is essential to maintain the right balance of this vitamin in your diet and be cautious with supplement intake, adhering to the Tolerable Upper Intake Levels (UL).
Common symptoms of vitamin A excess include nausea, vomiting, and headaches. Additionally, excessive vitamin A can lead to a condition called keratomalacia, which is characterized by dryness of the eyes, skin, and keratinization of various body systems.