So why do you eat grains anyways? A piece of bread has about 80 calories, 15 gms of carbohydrate, about 2 gms of protein. It contains 140 mg of salt. It may have a smattering of Vitamins. This depends on how much it is fortified. Importantly it has about 2 gms of fibre. Nutritionally there isn’t much going on. Barring the fact that you are loading up on calories. Even the carbohydrate is probably a fast sugar.
Sapiens haven’t eaten grain forever. Depending on which part of the world you live in this could range from a few hundred to a few thousand years. No longer though. When it was introduced it was an excellent source of calories. It would grow easily. You could domesticate it. It would store easily. If ever there was drought perhaps even save you from hunger. Eaten it contained a fairly high level of fibre. This was perhaps the most vital reason to consume grains.
The fibre helped to digest. It reduced the glycemic index of food. Aided with good fat, it helped make your food more wholesome. Grains such as brown rice, quinoa for example. Even fine ground grains that retained the bran and germ are considered whole grains. Two things changed. Modern farming and the flour mill. The mill made it possible to separate the bran and germ and grind just the endosperm. Low on nutrition but inexpensive it took over the world. Modern farming caused an increase in yield but reduced nutrients.
To most of us living in the modern society, we are not short on food. I have not seen a famine in my lifetime. We are blessed to have a choice. To choose high-quality high nutrition calories. It grows naturally. An army of people makes their living on delivering it to your doorstep. On demand. So what is your reason to eat grains?