More than 70% of adults in industrialized countries are overweight or obese, around one third sleep less than six hours per night, while type 2 diabetes and certain cancers have increased significantly. These developments are not primarily explained by genetics, but are understood as the result of a fundamental mismatch between evolutionarily shaped human biology and the modern environment. The human body developed under conditions of movement, food scarcity, and natural light cycles. Hunter-gatherers covered several miles daily at moderate intensity, alternated between activity and rest, and rarely consumed sugar in unprocessed form. In contrast, modern life is characterized by prolonged sitting, artificial light, constant availability of calorie-dense food, and chronic stress, leading to mismatches such as fatigue, obesity, and metabolic disorders.
Key health assumptions are presented as incomplete, such as the idea that only intense physical exertion is effective or that sleep can be endlessly optimized. From an evolutionary perspective, the human body is designed for regular, low- to moderate-intensity movement, while extreme exertion was rare. Sleep follows a natural day-night rhythm that is disrupted by artificial light, impairing hormonal and metabolic processes. Chronic sleep deprivation contributes to insulin resistance and increased appetite. Common beliefs about cancer and sugar are also considered insufficient: cancer is not viewed solely as random or genetic fate, but also as a result of long-term environmental factors such as overnutrition, physical inactivity, and inflammation. Sugar is not inherently toxic, but becomes problematic in combination with lack of movement and persistent caloric excess.
Other widespread assumptions concern the supposed harmfulness of running, the moral framing of discipline, and the equation of physical decline with inevitable aging. The human body is evolutionarily adapted for endurance activity, with moderate loading supporting joint health, while sudden overload after prolonged inactivity can cause damage. Resistance to movement is not interpreted as laziness but as an energy-conserving adaptation to past conditions. Many signs of aging, such as muscle loss or metabolic issues, are intensified by modern lifestyles. In traditionally active populations, people remain physically capable into old age and continue participating in daily tasks such as walking, carrying, and food gathering into their seventh decade.