Based on the information available, there is no evidence to suggest that consuming skim milk while taking Lipitor (atorvastatin), a medication used to treat high cholesterol, results in any adverse effects.

Lipitor belongs to a class of drugs known as statins, which work by reducing the amount of cholesterol produced by the body. It is generally considered safe and is one of the most widely prescribed medications in the world [1].

The U.S. National Library of Medicine's Drug Interactions Checker does not list skim milk as an interacting substance with Lipitor [2]. Furthermore, Lipitor's official patient information leaflet does not mention any interactions with dairy products, including skim milk [3].

However, it is always important to consult with a healthcare provider or pharmacist before starting or changing any medication, especially if you have questions about potential interactions with food or other substances.

Sources:
[1] "Atorvastatin." Drugs.com, www.drugs.com/atorvastatin.html.
[2] "Lipitor Interactions." Medscape, www.medscape.com/druginfo/monographs/lipitor-atorvastatin/interactions.
[3] "Lipitor (atorvastatin) Tablets, for Oral Use." Pfizer, Jan. 2021, www.accessdata.fda.gov/drugsatfda_docs/label/2021/020990s053,021134s010lbl.pdf.