What is one of the effects of excessive Vitamin E consumption?

Excessive consumption of Vitamin E can lead to gastrointestinal issues, including nausea and diarrhea. This occurs because high doses of Vitamin E may affect the digestive system's ability to function optimally, resulting in discomfort and the elimination of substances through diarrhea. While Vitamin E is important for various physiological functions, including acting as an antioxidant, when taken in excess, it can disrupt normal bodily functions, leading to these unpleasant side effects.

The other options are not correct in this context. Increased energy levels is not a direct effect of Vitamin E; instead, energy levels are more closely associated with macronutrients such as carbohydrates, proteins, and fats. Enhanced vitamin K absorption isn't influenced by Vitamin E to the extent suggested, as high levels of Vitamin E can actually interfere with vitamin K metabolism. Lastly, Vitamin E does play a role in immune response, but excessive amounts can be counterproductive and harmful rather than improving it. Thus, excessive intake mainly predisposes individuals to gastrointestinal disturbances.