Which type of vitamin must be consumed regularly as they are not stored in the body?

Water-soluble vitamins are the type that must be consumed regularly because they are not stored in the body. This category includes vitamins such as vitamin C and the B-vitamins (like B1, B2, B3, B6, B12, folate, and biotin). Since these vitamins dissolve in water, they are readily excreted through urine when consumed in excess, which means the body doesn’t have a sustainable way to store them for later use. Therefore, regular intake through diet is essential to maintain adequate levels for bodily functions.

On the other hand, fat-soluble vitamins (such as A, D, E, and K) can be stored in the body's fatty tissues and liver, allowing for less frequent consumption. This distinction is crucial in understanding dietary needs and planning nutrition appropriately.

Thus, the answer pertaining to the necessity of regular consumption directly highlights why water-soluble vitamins are essential and the unique characteristics that differentiate them from fat-soluble vitamins.