Reducing such foods is benefical
Al-Kāfi|Volume 8|Book 1|Chapter 443
عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ أَحْمَدَ بْنِ مُحَمَّدِ بْنِ خَالِدٍ عَنْ عَلِيِّ بْنِ الْحَكَمِ عَنْ مُوسَى بْنِ بَكْرٍ عَنْ أَبِي الْحَسَنِ مُوسَى (عليه السلام) قَالَ لَيْسَ الْحِمْيَةُ أَنْ تَدَعَ الشَّيْءَ أَصْلًا لَا تَأْكُلَهُ وَ لَكِنَّ الْحِمْيَةَ أَنْ تَأْكُلَ مِنَ الشَّيْءِ وَ تُخَفِّفَ.
443. A number of our companions, from Ahmad Bin Muhammad Bin Khalid, from Ali Bin Al-Hakam, from Musa Bin Bakr, who has narrated the following: Abu Al-Hassan Musa عليه الصلاة والسلام has said: ‘Dieting is not leaving something which you originally did not eat, but the dieting is to eat from the thing but at a reduced level’.
- Mirʾāt al-ʿUqūl fī Sharḥ Akhbār Āl al-Rasūl (16/318)
- Ṣaḥīḥ al-Kāfī, vol. 3, p. 401