In Africa the African Bushmen always make a small fire - they don't like to be seen. The Africans make a bigger fire and White Man always make one hell of a big fire, lots of fuel and sparks. I learned from the Bushmen to make small long burning fires with little effort.
In northern Namibia (Southwest Africa) grows a tree that is named 'Muntu' by the blacks - 'Muntu' means people. When dead and still upright these trees look like people from a distance. When they fall over, they are picked up just like that and carried back to a 'kraal' or campsite - no chopping of trees. Three of these long trees/logs are used to make a small fire and when finished cooking, they are simply pulled apart. These logs will smolder over night and the next morning they are put together again and the little fire starts up again. These logs can last for a week, sometimes longer - all the cooking is done on it and at night it provides light.
Whenever out with modern man ... out comes the chainsaws, axes and chains. Trees are chopped up in little pieces and stack somewhere - all of this takes up lots of energy. Providing light or cooking with small pieces of wood like that, takes effort - continues feeding of a big fast burning fire.
Imagine a pot on a 'camping fire' - the effort if you must keep it boiling with grass or paper only. Fast burning stuff, big short term flames and the continues effort to keep it going.
The hunter-gatherer's metabolism is being kept going by long solid 'Muntu' trees - no effort. Modern man's metabolism is fed by very fast burning fuels - big short term flames - lots of effort to keep it going.
Your body and brain need constant fuel/energy and carbohydrates can best be described as kindling. Whole grains and legumes makes up the twigs. Starches (cereals and potatoes) and simple sugars are the paper that's being fed to the fire. Alcohol is just that ... gasoline to a fire. If carbohydrates are your main source of 'fuel' - you'll work hard to feed that fire, this will be ongoing and consistent work. You'll crave this fuel on a regular basis. The simpler the sugar the quicker it'll burn and you'll have to run to fuel the fire again. Carbohydrates provide an explosion of fire ... then there's nothing ... you'll have to fuel up quickly to keep going - constant work, constant explosions and then ... nothing.
Hope you can see where some of the 'expert' dietary advice comes from - they tell you to eat every two hours - eat small meals. If you are dependent on carbohydrates, then this will be your life. You'll make some industry rich, you'll make the drug companies rich and you'll keep the medical profession in business.
You need 'Muntu' logs ... to free you from sugar, alcohol and caffeine boosts. No hunter-gatherer would've survived living like this. You're not designed to eat like this. Dietary fat is like a big 'Muntu' log on a fire - it burns at a regular, easy and even rate. This even flame keeps the hormone leptin under control, keeps insulin in its place and your appetite satisfied. Protein in excess is converted to sugars - in moderate quantities it is used for structural repair and maintenance.
Ketones, an energy producing by-product of the metabolism of fats, are used effectively and safely by the brain and all other tissues of the body - they are the preferred fuel for every organ in the body. Current research indicates they are less damaging than glucose.
One can go for many hours on this longer burning type of fuel without discomfort or maddening cravings - no dizziness, fogginess, irritability, fatigue or mood swings. No hunter-gatherer could afford these type of yuppie luxuries!!