The Enforcement Rules of the Prison Act Article 37

Food nutrition for prisoners shall be sufficient to meet their health requirements and the quality shall meet health standards; meals shall be prepared and supplied at proper times, and sufficient drinking water shall be provided.Food for ill or old-aged prisoners may be adjusted based on health or medical requirements. The same shall be applicable to food brought into the Prison by the prisoners who are unable to prepare their own food, or food for children born inside Prison.In preparing the food under the preceding two paragraphs, Prisons may refer to the food guidelines and suggestions published by the Health Promotion Administration, Ministry of Health and Welfare; also nutritionists may be consulted as required.
中文原文 監獄行刑法施行細則第37條
受刑人飲食之營養,應足敷其保健需要,品質須合衛生標準,適時調製,按時供餐,並備充足之飲用水。
疾患、高齡受刑人之飲食,得依健康或醫療需求調整之。
無力自備飲食之受刑人所攜帶入監或在監生產子女之飲食,亦同。
監獄辦理前二項飲食得參考衛生福利部國民健康署發布之飲食指南建議;必要時,得諮詢營養師之意見。

English translation for reference only; the Chinese text prevails. Not legal advice.