Miley Cyrus decided to stop being vegan primarily because she experienced issues with her cognitive function, specifically brain fog, and felt her brain was not functioning properly on the diet.
After being vegan for a very long time, Cyrus recognized a need to make dietary changes for her health. She explicitly stated that she had to reintroduce fish and omegas into her diet. This decision was a direct response to her concerns about her brain's performance, indicating that she believed her vegan diet was not adequately supporting her neurological health. Her choice highlights how individuals may adjust their dietary practices based on their personal health needs and how their body responds to different nutritional approaches.