Final answer:
As we age, the absorption of vitamin B₁₂ increases. Vitamin B₁₂ is a water-soluble vitamin that is stored in the body. The small intestine absorbs vitamins naturally found in food and supplements, including fat-soluble vitamins such as vitamin A, vitamin D, vitamin E, and vitamin K.
Step-by-step explanation:
As we age, the absorption of vitamin B₁₂ increases. Vitamin B₁₂ is a water-soluble vitamin that is stored in the body. The small intestine absorbs vitamins naturally found in food and supplements, including fat-soluble vitamins such as vitamin A, vitamin D, vitamin E, and vitamin K. Dietary lipids aid in the absorption of these fat-soluble vitamins, which are needed for various bodily functions.