Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to Drug Patent Watch [1], Lipitor works by inhibiting an enzyme called HMG-CoA reductase, which is involved in the production of cholesterol in the liver. By reducing the amount of cholesterol produced, Lipitor can lower the levels of LDL (low-density lipoprotein) or "bad" cholesterol in the blood.

As for the effect of Lipitor on plant-based protein absorption, there is limited information available. However, a study published in the Journal of Clinical Lipidology [2] suggests that Lipitor may have a negative impact on the absorption of certain nutrients, including plant sterols. Plant sterols are naturally occurring compounds found in plant-based foods that can help lower cholesterol levels in the blood.

The study found that patients taking Lipitor had lower levels of plant sterols in their blood compared to those not taking the medication. This suggests that Lipitor may interfere with the absorption of plant sterols and possibly other nutrients found in plant-based foods.

Another medication, called Zetia (ezetimibe), is also used to lower cholesterol levels by inhibiting the absorption of cholesterol in the small intestine [3]. Zetia works differently than Lipitor and does not inhibit HMG-CoA reductase. However, like Lipitor, Zetia may also have an impact on the absorption of certain nutrients.

In conclusion, while there is limited information available, Lipitor may have a negative impact on the absorption of plant sterols and possibly other nutrients found in plant-based foods. Patients taking Lipitor should speak with their healthcare provider about ways to ensure they are getting adequate nutrition from their diet.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4642426/
[3] https://www.medicalnewstoday.com/articles/zetia