I always found the concept of energy in the human body very intriguing… or in any organism for that matter. The term energy is very abstract to me. For example, there is a difference to “having the energy to go for a walk” or “the energy to power the oven”. One phrase clearly describes energy as electricity and the other is the energy needed for an activity that we humans undertake. So what is energy in a human being or an animal? If you would like to share feedback or have a suggestion for a topic, I can now be reached on twitter under @ChemistryinEve1 or you can leave a comment on my website. Alternatively, you can send an email to [email protected]. Sources How is energy produced · https://www.metabolics.com/blog/how-does-the-body-produce-energy Adenosine triphosphate – the body’s Mars Bar · https://en.wikipedia.org/wiki/Adenosine_triphosphate ATP production under aerobic conditions · https://www.ncbi.nlm.nih.gov/books/NBK553175/ · https://en.wikipedia.org/wiki/Glycolysis · https://en.wikipedia.org/wiki/Citric_acid_cycle · https://en.wikipedia.org/wiki/Oxidative_phosphorylation · https://en.wikipedia.org/wiki/Beta_oxidation · https://en.wikipedia.org/wiki/Ketone_bodies ATP production under anaerobic conditions · https://en.wikipedia.org/wiki/Fermentation · https://en.wikipedia.org/wiki/Anaerobic_respiration · https://en.wikipedia.org/wiki/Adenosine_triphosphate#ATP_recycling What does it feel like to run low on ATP? · https://www.verywellhealth.com/low-energy-and-atp-in-fibromyalgia-and-me-cfs-4125121 The biochemistry of muscle fatigue · https://pubmed.ncbi.nlm.nih.gov/3964254/ Why ATP and not GTP, TTP or CTP? · https://www.researchgate.net/post/Why_did_evolution_favor_ATP_and_not_GTP_TTP_or_CTP https://biology.stackexchange.com/questions/11286/why-is-atp-the-preferred-choice-for-energy-carriers