Yeah, I don't think mankind has ever gone without carbs in our diet, I doubt mankind would have survived with out them. That said Americans in general are way overweight due to excess consumption and have addictions to sugar and processed foods. It's funny I can eat a plate of restaurant fries and feel great, if I eat over a handful of potato chips they don't sit well. The ingredients of potato chips seem simple enough but there's something about them my gut doesn't like.
Agreed the food pyramid is a joke and is a good example of corporate funded science. It took a massive amount of people that went against the age old recommended diets and went on Atkins diets to upend medical science on what is good and bad for us.
If you are in a famine, then sugars from carbs will keep you from starving to death. But how often do you go to the store and see no beef, poultry, eggs, fish, crustaceans, etc. in this day and ags? (Pandemic aside) That being said, I have seen in survival courses that plants alone will not give you enough caloric energy to overcome your caloric burn. Got to have some fat, either from animals or nuts of some kind.
fat is crucial to a diet. people, depending on locale, ate carbs in the forms of fruits, berries, wild onions, etc. But no, whoever sold you that whole wheat is good for you lied. And people commonly believe that a wheat bagel with cream cheese spread is a "healthy" breakfast.
Meat and rice, chicken and rice, peanut butter ( natural peanut butter not the Jiff or Skippy bullshyte with all the seed oils mixed in ) and a banana or apple, steak, baked fish....is pretty much all I eat. Pretty boring actually.
But I'm more or less at the same weight I was in high school, 20 years later. Not many people can claim the same.