All types of dietary fats contain lipids. Fat-soluble vitamins that are present in foods also contain lipids. Lipids are greasy, water-insoluble organic compounds that are primary building blocks of animal cells.
Omega-6 unsaturated fat lipids are found in sunflower oil, safflower oil and soybean oil, while omega-3 unsaturated fat lipids are present in sardines, salmon, trout, anchovies, shellfish and canola oil.
Monounsaturated fats are found in peanut oil and olive oil. Trans fats are lipids that have gone through a process known as hydrogenation, which causes the fat to harden. They are usually present in processed foods, such as baked goods, potato chips, margarine and prepared salad dressings.
Saturated fats are lipids that are solid at room temperature. These types of lipids are present in meats, milk, cheese, cocoa butter, coconut oil, powdered coffee creamer and prepared whipped toppings. Margarine, butter and shortening also contain saturated fat lipids.
Vitamin A is a fat-soluble lipid that is found in whole milk and liver. It's also found in vibrantly colored vegetables, such as collard greens, sweet potatoes and watermelon. The lipid vitamin D is produced by sunlight and is also found in fatty fish like salmon, while the lipid-containing vitamin E is present in nuts and seeds. Vitamin K is also a lipid that is present in mustard greens, Swiss chard, eggs, cabbage and cauliflower.