Lipitor (atorvastatin) is a medication that is commonly prescribed to help lower cholesterol levels in the blood. While taking Lipitor, it is important to be aware of certain low-fat substitutes that may interact with the medication. According to the sources provided, there are no specific low-fat substitutes that should be avoided while taking Lipitor. However, it is recommended to avoid consuming large amounts of grapefruit juice, as it can increase the levels of atorvastatin in the blood, which can lead to potential side effects [1][2].

In addition to taking Lipitor, there are alternative methods to help lower cholesterol levels, such as lifestyle changes including a healthy diet, regular exercise, and maintaining a healthy weight. These alternatives can be effective for some people, but may not be sufficient for those with more severe cases of high cholesterol [3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.medicalnewstoday.com/articles/atorvastatin-oral-tablet
[3] https://www.healthline.com/health/high-cholesterol/alternatives-statins