Cholesterol is a lipid essential for producing hormones and takes two forms: LDL, or bad cholesterol, and HDL, good cholesterol. LDL (low-density lipoprotein) contributes to plaque, which can clog arteries and increases the risk of strokes and heart attacks. HDL (high-density lipoprotein) removes LDL from the arteries and carries it to the liver to be broken down.
Lipids are essential for a healthy, balanced diet. They provide energy and also play a key role in the production of hormones and cell membranes, as well as in the absorption of nutrients and fat-soluble vitamins.
Carbohydrates are composed of carbon, oxygen and hydrogen, and are divided in 4 groups: oligosaccharides (glycose), monosaccharides and disaccharides which are sugars and serve as a quick source of energy, while polysaccharides, like starches serve for storing energy.