I have a bone to pick with the recommended daily allowances. I have observed that optimal dietary requirements change over time. There are physiological changes in childhood, puberty, young adult and mature adult and the aged.
When a child is born they thrive on human breast milk. Even as humans grow old we can digest human breast milk. A curiosity is drinking milk of another species like goat milk or cow milk. It seems as a general rule up to 6 years of age humans can digest cow or goat milk, afterwards many humans become lactose intolerant.
Honey is a food that is not recommended to children below 7 years old as they do not have the necessary digestive capabilities to fully digest honey. The result will be allergies if given to younger children.
A high carbohydrate diet seems to be needed by young children along with a good amount of protein and some fat. It seems high amounts of carbohydrate fuel the activity of young children and fuel their growth. Putting children on a low carbohydrate diet may not be a good idea as it may stunt their growth.
But when people have finished growing up, and if their daily activity is not that of a laborer or an athlete, then the person must adjust his diet and cut back on carbohydrates, go on a low carbohydrate diet. His growing days are finished, he no longer needs that much carbohydrates. If he eats the same proportion of carbohydrates as during his youth he gets into a misshapen trouble as he expands to obesity or becomes diseased and some people may call excess carbohydrates as poison at this time.
At a very old age it seems that animal meat requirements are lower, but I’m not too sure about this. I need to learn more about this 90+ aged diet. Maybe when I get to that age I will write about it.