Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. It works by inhibiting the enzyme HMG-CoA reductase, which is responsible for producing cholesterol in the liver [2]. According to a study published in the American Journal of Cardiology, atorvastatin is more effective than a low-fat diet in reducing LDL cholesterol levels [3]. The study found that after six weeks of treatment, atorvastatin reduced LDL cholesterol levels by 47%, while a low-fat diet reduced LDL cholesterol levels by 7% [3]. However, it is important to note that a low-fat diet can still be beneficial in reducing cholesterol levels, especially when combined with other lifestyle changes such as exercise [2]. As with any medication, Lipitor has potential side effects and should only be taken under the supervision of a healthcare provider [1].

Sources:
[1] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1312230/
[3] https://www.drugpatentwatch.com/p/tradename/LIPITOR