No.
Our hair is mainly composed of hair follicles, hair roots and hair trunks. And the usual [long hair], It refers to the hair stem of the hair. The stem is a dead cell. No metabolism, So it won’t consume nutrition. The only thing in hair that needs nutrition is hair follicles. The metabolism of hair follicles is going on all the time, It has nothing to do with the length of hair. Besides, The nutrition consumed by hair follicles accounts for only a very small part of the nutrition needed by the human body. It is totally unnecessary to worry that hair will absorb the nutrition of the body. If there is any inconvenience in long hair, the only possibility is that long hair is difficult to wash and dry. Every time you wash your hair, it is a baptism of your patience and physical strength.