Why Didn't Ancient Humans Get Fat? (And Why You Do)

In this video, we follow the Hadza of northern Tanzania, one of the last foraging peoples on Earth, up a baobab tree for honey and into the field with the researchers who measured every calorie they burn. You'll see what doubly labeled water, a month-long ward study at the National Institutes of Health, and a comparison of two Pima communities reveal about how your body handles food, why ultra-processed foods are so easy to overeat, and what ancient diets and gut bacteria can teach us about modern weight gain. Researchers and studies mentioned: Herman Pontzer (Hadza energy expenditure), David Raichlen (sedentary time), Kevin Hall (ultra-processed food trial), Justin Sonnenburg (Hadza gut microbiome), Eric Ravussin (Pima study), Hillard Kaplan (Tsimane heart health), and James Neel (thrifty gene hypothesis). This video is for education and entertainment, not medical advice. Talk to a doctor before changing your diet or exercise routine. Subscribe for more stickman-style explainers on ancient humans, human evolution, and the strange science of your own body. #AncientHumans #HumanEvolution #hadza #ancientarabia #arabia #history #ancienthistory #historydocumentary #archaeology