A healthy cell membrane is made of a lipid layer (fat) that is firm enough to keep the contents of the cell inside (cholesterol is used for this) yet supple enough to expand with fluid and allow nutrients in through its barrier and waste out. (phospholipids are used for this flexibility). Without the right amount of healthy fats in the diet to replace this regularly, the membrane can go very rigid and be mainly cholesterol based. It loses its flexibility and the ability to remove its waste or receive the important nutrients it needs to function.
Without the ability to remove waste and receive nutrients, the cell becomes very toxic and will eventually dump its toxins in the extra-cellular fluid, This will then be taken through the liver and cause congestion.
It is really important to eat healthy fats and essential fatty acids in the diet from sources such as avocados, coconut, nuts and seeds and oily fish to keep the cell membranes healthy.