A feed unit for articles includes a guide extending along a guide longitudinal axis to define a linear feed path for such articles. The guide is for accommodating articles arranged in a row one after the other and to guide the articles as the articles move along the linear feed path. The articles have a characteristic length corresponding to their size along the longitudinal axis. At least one segment of the guide is progressively rotated about the guide longitudinal axis by a total angle greater than 180° and with an angular variation per unit of linear measurement such that, substantially for each portion of the linear feed path equal to the characteristic length of the articles, the guide is rotated about the longitudinal axis by an angle greater than 4°.