1. Carbon Dioxide (CO2): This is a waste product of the breakdown of glucose. It diffuses out of the cells and is exhaled by the lungs.

2. Water (H2O): Water is produced during the electron transport chain, the final stage of cellular respiration.

3. Energy (ATP): This is the main product of cellular respiration. ATP is the energy currency of cells and is used to power various cellular processes.

4. Heat: A small amount of energy from the breakdown of glucose is released as heat. This helps to maintain body temperature.

It's important to remember that the exact amounts of these byproducts produced will vary depending on the type of fuel being used (e.g., glucose, fats, proteins) and the efficiency of the process.