Based on the information provided, there is no explicit warning against consuming yogurt while taking Lipitor (atorvastatin). Lipitor is a statin medication used to treat high cholesterol levels [3].

However, the website www.nkch.org/blog/foods-that-can-fool-with-your-meds (source [2]) mentions that certain foods can potentially interact with medications. This interaction can either decrease the effectiveness of the drug or increase the risk of side effects.

The article from WebMD [3] does not list yogurt as a food to avoid while taking Lipitor. However, they do advise avoiding grapefruit and grapefruit juice, as they can increase the level of Lipitor in your blood, which can increase the risk of side effects [3].

Therefore, while yogurt is not explicitly listed as a food to avoid, it is always important to consult with a healthcare provider or pharmacist for personalized advice regarding food and drug interactions [1][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.nkch.org/blog/foods-that-can-fool-with-your-meds
[3] https://www.webmd.com/drugs/2/drug-3330/lipitor-oral/details