Based on the information available, there is no direct evidence to suggest that Lipitor, a medication used to treat high cholesterol, decreases the body's omega-3 content. Lipitor is a statin, a type of drug that works by blocking a substance your body needs to make cholesterol [1].

On the other hand, omega-3 fatty acids are a type of fat that is essential for human health. They are necessary for brain function, reducing inflammation, and may help decrease the risk of heart disease and stroke [2].

While both Lipitor and omega-3 fatty acids can impact cardiovascular health, they do so in different ways and there is no evidence to suggest that Lipitor directly decreases omega-3 content in the body. However, it's always important to consult with a healthcare provider or pharmacist for personalized advice regarding medication and dietary supplements [3].

Sources:

[1] Mayo Clinic. (2021). Atorvastatin (Oral Route). Retrieved from <https://www.mayoclinic.org/drugs-supplements/atorvastatin-oral-route/description/drg-20063083>

[2] National Center for Complementary and Integrative Health. (2018). Omega-3 Fatty Acids. Retrieved from <https://www.nccih.nih.gov/health/omega-3-fatty-acids>

[3] DrugPatentWatch. (2021). Atorvastatin Calcium. Retrieved from <https://www.drugpatentwatch.com/drugs/atorvastatin-calcium>