I remember times when devotees used to cook on ghee. Well, some still do. But it used to be on a much larger scale. Nowadays it is quite common that halva, subji, pakoras, or rice is cooked in oil. Which gives it a nasty taste and nasty effect on the body. Or it is done purely for the satisfaction of vegan brain and health-destroying culture. I was cooking in Stockholm Govinda's in the 90s. Everything there was cooked, fried, and roasted in ghee. People loved it.
"IN THE AYURVEDIC SCRIPTURES OIL IS PARTICULARLY MENTIONED TO BE HARMFUL FOR THE STOMACH..."
"Pure Ghee (Clarified butter) offered on the fire of 'Yajna' produces more and more Ghee but non-acceptance of such sacrificial rites, under the plea of non-productive economy, drives away completely the production of ample pure ghee, yielding place to the harmful hydrogenated vegetable oils. In the 'Ayurvedic' scriptures oil is particularly mentioned to be harmful for the stomach but in the absence of sacrificial energy of the human being he is forced to accept harmful vegetable oil for the stomach in the name of and absence of pure unadulterated clarified butter. That is the importance of the process of 'Yajna' and that is the Law of Nature.
Foolish people think vitamin value of foodstuff in their own way and push into the stomach all sorts of rubbish thing thinking that 'Vaiswanara' heat, representative of the Supreme Lord, will accept any such rubbish thing for assimilation. The case is different. The 'Vaiswanara' representative power of Godhead in the stomach of the human being can accept only leaves, flower, fruits of the vegetable group and pure water and milk for vitaminising the human energy. The mouth being the entrance door to the region of the stomach, it must guard the tongue of every human being to acquire the quality of a Brahmin, who can accept only foodstuff of 'Satwik' quality. Description of Satwik quality foodstuff is mentioned in Bhagwat Geeta and that also of the Brahmin in fact."
From Back to Godhead magazine, May 20, 1956 in an article by Srila Prabhupada.