Final answer:
Taking megadoses of vitamin K daily can poison the body by building up too much vitamin K, leading to symptoms such as nausea, vomiting, and headache.
Step-by-step explanation:
Taking megadoses of vitamin K daily can have negative effects on the body. One potential negative effect is that it can poison the body by building up too much vitamin K. Consuming excessive amounts of vitamin K can lead to symptoms such as nausea, vomiting, and headache. It is important to follow the recommended daily intake of vitamins to avoid any adverse effects.