Lipitor is a brand name for the drug atorvastatin, which is used to lower cholesterol levels in the blood. According to DrugPatentWatch [1], Lipitor works by inhibiting an enzyme that the liver uses to produce cholesterol. As for interactions with food, Stat News [2] reports that grapefruit and grapefruit juice should be avoided while taking Lipitor because they can increase the level of the drug in the blood, which can lead to adverse side effects. However, there is no mention of guacamole in the sources provided.

Regarding the best snacks for lowering cholesterol, Everyday Health [3] suggests snacks that are high in fiber and low in saturated fat. Examples include fresh fruits and vegetables, whole-grain crackers with hummus or low-fat cheese, and nuts. It is important to note that while diet can play a role in managing cholesterol levels, it is essential to follow the advice of a healthcare professional and take any prescribed medications as directed.

In conclusion, there is no information available in the provided sources regarding the amount of guacamole that is too much with Lipitor. However, it is advisable to avoid grapefruit and grapefruit juice while taking Lipitor. Eating a diet that is high in fiber and low in saturated fat can also be beneficial for managing cholesterol levels. It is essential to follow the advice of a healthcare professional regarding diet and medication management.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.statnews.com/2016/11/03/medications-food-drug-interactions/
[3] https://www.everydayhealth.com/high-cholesterol/diet/the-best-snacks-for-lowering-cholesterol/