In Lorenzo's oil what did they remove from his diet?

In "Lorenzo's Oil," Lorenzo's parents remove all sources of long-chain fatty acids from his diet. This includes eliminating foods like dairy, meat, and certain oils, which are high in these fatty acids, in favor of a diet rich in short- and medium-chain fatty acids. This dietary change was part of their effort to manage Lorenzo's adrenoleukodystrophy (ALD) and reduce the accumulation of toxic substances in his body.