Why Are Vitamins Fat Soluble?

Vitamins A, D, E, and K are called the fat-soluble vitamins, because they are soluble in organic solvents and are absorbed and transported in a manner similar to that of fats.

What makes something fat soluble?

Fat-soluble vitamins are predominantly nonpolar and hence are soluble in nonpolar solvents such as the fatty (nonpolar) tissue of the body.

Why are vitamins soluble in water?

Water-soluble vitamins are those that are dissolved in water and readily absorbed into tissues for immediate use. Because they are not stored in the body, they need to be replenished regularly in our diet. Any excess of water-soluble vitamins is quickly excreted in urine and will rarely accumulate to toxic levels.