These giants in Genesis are not human in nature, they are higher in stature than ordinary humans and are referred to as The Nephilim.
The Nephilim are the product of the sons of god mingling with the daughters of Adam and are believed to be the sole reason for the flood that happened during Noah.
Giants may be 10ft or 12ft in height according to the Bible and this is not common to humans, why?
Because humans who grow very very tall in stature have some defects in the body which is called "Gigantism" in medical science.
Gigantism is the excessive symmetrical growth, especially of the arms and legs, accompanied by a corresponding growth in height of the entire body.
In humans, when gigantism begins in childhood, before normal ossification has been completed, it is usually caused by overactivity of the growth hormone. Hereditary defects that prevent normal ossification at the time of puberty, but permits continued growth, may also cause a type of gigantism.
Because the growth hormone depresses the secretory powers of the gonads, gigantism is often accompanied by weakened sexual function which is called eunuchoid gigantism.
Individuals affected by either type of gigantism are muscularly weak.
Acromegaly, a related condition caused by excessive production of the pituitary growth hormone, occurs in the third decade of life.
It usually results in excessive growth of the hands, feet, and chin.
Genesis 6:4–
"There were giants in the earth in those days; and also after that, when the sons of God came in unto the daughters of men, and they bore children to them, the same became mighty men which were of old, men of renown".
I am @edith-4angelseu and thank you for stopping by my neighbourhood.
Mighty men of renounce
I learnt that they were the products of cross-breed