2026-07-06 – News – www.theguardian.com
Yes, digesting food requires energy, but you need to do more than snack for a meaningful impact
It helps to understand what people mean when they talk about “metabolism”, says James Betts, professor of metabolic physiology at the University of Bath. Usually, they’re referring to metabolic rate; the amount of energy your body burns in a given time. This is largely determined by factors such as your size, age, sex and body composition.
Your daily energy expenditure comes from three main sources: your resting metabolism (the energy needed to keep your organs and tissues functioning), the calories burned processing food, and physical activity. Of those, exercise and movement are by far the most variable.
