Without the cholesterol-lowering medication Lipitor (atorvastatin), it is possible for an individual's cholesterol level to rise over time, especially if lifestyle modifications are not made [1][2]. Lipitor is a type of drug known as a statin, which reduces the production of cholesterol in the body [3].

When a person stops taking Lipitor, their liver starts producing more cholesterol again, which can lead to an increase in LDL (low-density lipoprotein), or "bad" cholesterol levels [3]. This can subsequently raise the risk of heart disease and stroke [3].

However, it is important to note that lifestyle changes can have a significant impact on cholesterol levels. These changes include eating a healthy diet low in saturated fats and trans fats, getting regular exercise, maintaining a healthy weight, and avoiding smoking [1][2].

In some cases, even with lifestyle changes, medication may still be necessary to control cholesterol levels [1]. If a person stops taking Lipitor, they should consult with their healthcare provider to discuss other treatment options and to monitor their cholesterol levels closely [2].

Sources:
[1] https://www.nhs.uk/medicines/atorvastatin/how-and-when-to-take-atorvastatin/
[2] https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statins/art-20045772
[3] https://www.drugpatentwatch.com/p/tradename/LIPITOR