The answer is active transport and diffusion. To simplify, water-soluble nutrients enter into the body by way of active transport and diffusion. The active transport is a kind of transport in which ions or molecules move in contradiction of a concentration gradient which means movement in the direction opposite that of diffusion or movement from an area of lower concentration to an area of higher concentration. Hereafter, this procedure will have need of expenditure of energy and the help of a kind of protein named a transporter protein while diffusion is the passive movement of molecules or particles alongside a concentration gradient or from regions of advanced to regions of lower concentration.
