4. What is the difference between fat-soluble vitamins and water-soluble vitamins?

Fat-soluble vitamins and water-soluble vitamins differ in their solubility, storage, and excretion in the body.<br /><br />Fat-soluble vitamins, which include vitamins A, D, E, and K, are soluble in fats and oils. They can be stored in the body's fatty tissue and liver, and are not excreted as easily as water-soluble vitamins. This means that they can accumulate in the body over time, and excessive intake can lead to toxicity.<br /><br />Water-soluble vitamins, which include the B vitamins and vitamin C, are soluble in water. They are not stored in the body, and excess amounts are excreted in the urine. This means that they need to be consumed more regularly than fat-soluble vitamins, as they are not stored for long periods.<br /><br />In summary, the main difference between fat-soluble and water-soluble vitamins is their solubility, storage, and excretion in the body. Fat-soluble vitamins are stored in the body and not excreted as easily, while water-soluble vitamins are not stored and are excreted in the urine.