Lipitor is a brand name for the drug atorvastatin, which is a medication used to lower cholesterol levels in the body [2]. When taking Lipitor, it is important to avoid consuming grapefruit or grapefruit juice as it can increase the risk of side effects [2]. However, there are no specific low-fat substitutes that need to be avoided when taking Lipitor [1]. It is generally recommended to follow a healthy and balanced diet when taking this medication to maximize its effectiveness in reducing cholesterol levels in the body [2]. It is important to note that before taking any medication, it is best to consult with a healthcare provider to discuss any potential risks or interactions with other substances [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/atorvastatin-oral-tablet
[3] https://www.goodrx.com/atorvastatin/what-is