(a) Vary the scale of prison diet generally, or that prescribed in respect of the prisoners of any class; (b) prescribed a special scale of prison diet in respect of the prisoners confined in any prison or in the prisons situated within any specified local area; and (c) prescribed a special scale of prison diet in respect of any period or during any season of the year. Prisoners to receive diet according to scale: Rule469. (i) Every prisoner shall be entitled to receive daily at the appointed meal hours, food according to the scale prescribed for the class to which he belongs, unless he is permitted by rules to receive food from private source. No prisoner shall at any time receive, consume or possess any articles of food or drink not provided for or supplied to him under the rules. (ii) Rules regarding diet of superior class prisoners will be found in rule 260. Power reserved to Medical Officer to vary prison diet: Rule470. In the case of any prisoner in which the Medical Officer considers the prescribed diet to be unsuitable or insufficient for reasons of health, he may order in writing a special diet or extra articles of diet for such prisoner. The change, in the dietary of any class of prisoners requires the sanction of the Inspector- General. Labouring and non-labouring diet: Rule471. (i) The following classes of prisoners shall be entitled to the labouring diet:(1) Male convicted prisoners over 16 years of age sentenced to rigorous imprisonment. (2) Male convicted prisoner over 16 years of age sentenced to simple imprisonment who labour voluntarily. (3) Prisoners under sentence of death. (ii) The following classes of prisoners shall be entitled to non-labouring diet:(1) Male convicted prisoners sentenced to simple imprisonment. (2) Women prisoners. 163