Fat-soluble vitamins are essential nutrients that dissolve in fats and oils. They include vitamins A, D, E, and K. These vitamins are stored in the body's fatty tissues and liver, allowing the body to use them when needed. Because they can accumulate, it's important to consume them in appropriate amounts to avoid toxicity. Unlike water-soluble vitamins, which are excreted through urine, fat-soluble vitamins require dietary fat for absorption. Foods rich in these vitamins include dairy products, fish, nuts, and leafy greens. A balanced diet helps ensure adequate intake of these vital nutrients for overall health.