Our ancestors were always moving, foraging for food, and facing immediate threats. Today, our sedentary lifestyle leads to obesity, heart disease, and diabetes. They followed natural sleep patterns, rising with the sun and sleeping after sunset. Modern habits and artificial light disrupt our circadian rhythms, harming our health and cognitive function. Their diets were natural and varied. Modern diets, however, lead to nutritional deficiencies and chronic illnesses. Community living was the norm. Now, digital interactions often lead to isolation and mental health issues. Our brains evolved for immediate dangers, not modern stresses, resulting in overreactions and poor long-term decisions. Understanding this helps us make better choices: stay active, eat well, build strong social connections, and be mindful of [[Cognitive bias|cognitive biases]].