A lot of people don ' t have a reason to think so . But when you look at worldwide situations , there are so many people who have witnessed it . Most of the time it ' s just shut down . Largely because government still keeps it secret . Also , if you look at historical monuments , like the pyramids , humans today would have to go through incredible lengths to recreate it . How did those people do it ? With no modern materials ? <| sep |> Yeah absolutely . What else are you gonna say when they ask you how good is x ? when they ' re coming up against them next game <| sep |> 1 People tend to overestimate both food and exercise and their body ' s needs . They also might not have eating disorders . Some people walk 5 miles back and forth from work but don ' t exercise . Others eat a ton of veggies which are extremely low in calories . Some people don ' t eat many meals , but one large one . The base metabolism between two similar bodied individuals varies a few hundred caloriesevolution through 100 billion of people over millions of years has ensured a pretty level metabolism rate . 2 The dieting industry perpetuates the idea that you must be doing something special in order to lose weight so they make money . Add on top of that you tell people Do this to get X they are more likely to do it . CICO takes time to explain and it ' s hard to understand the core concepts without giving lectures on it . And the intro basic , which honestly most people would ever need , don ' t tell the full story but enough for people to achieve their goals . Keep this in mind If there ' s money or fame to be made from saying something , question it .