Carbohydrates provide short-term energy, and examples of food that contain carbohydrates are bread, pasta, rice and sugar.
Lipids provide long-term energy storage, warmth, and make cell walls. Examples of items that contain lipids are body fat, oils, and waxes.
candles have wax in them
The main example for proteins are enzymes and the function of enzymes is to speed up chemical reactions. But one of the smaller examples for proteins are hair, nails, and skin and the function of these is structure.
Nucleotides are the DNA and RNA in a living organism's body, and the function of nucleotides is to contain the genetic information.