Lipids

Lipids are fat-like substances found in the blood and body tissues.  They are a family of molecules composed of carbon, hydrogen, and oxygen, but unlike carbohydrates, they are insoluble in water and cannot dissolve in the blood. Lipids are found predominately in butter, oils, meats, dairy products, nuts, and seeds, and in many processed foods. ​

The average adult requires approximately 70 grams of fat per day
The three main types of lipids are triglycerides (triacylglycerols), phospholipids, and sterols. The main job of lipids is to store energy. Lipids provide more energy per gram than carbohydrates (nine kilo calories per gram of lipids versus four kilocalories per gram of carbohydrates). In addition to energy storage, lipids serve as cell membranes, surround and protect organs, aid in temperature regulation, and regulate many other functions in the body. Lipids is essential for a healthy body but it is important that we consume the right kinds from our diet mainly HDL or good cholesterol. 
​​​​LDL Cholesterol or "bad" cholesterol known to cause blockages in arteries.
HDL Cholesterol or "good" cholesterol that protects against blockages. 
Triglycerides may increase the risk of heart disease and obesity.