Picked this up after hearing him on a podcast - interesting but quite depressing book the looks at food / eating / exercise & diet it’s impact on ourselves & the planet.
Chapter on energy constraint interesting - from his research
“Humans and other species adapt dynamically to changes in daily physical activity, maintaining total energy expenditure within a narrow range. Chronic exercise thus suppresses other physiological activity, including immunity, reproduction, and stress response. This exercise-induced downregulation improves health at moderate levels of physical activity but can be detrimental at extreme workloads.”