Comment by adrian_b

Nutrients are divided into micronutrients, most of which are needed in quantities much smaller than 1 gram per day, i.e. vitamins, minerals, essential fatty acids and a few amino-acid derivatives, and macronutrients, which form the bulk of what you eat, i.e. carbohydrates, protein and fat.

What you mean is that modern wheat was selected for high production per area, which can be attained only when the seeds contain smaller amounts of micronutrients, so that their limited availability will not inhibit growth.

On the other hand, all plant seeds, including wheat seeds, in their dry form consist almost only of nutrients, unlike the other plant parts, which usually have very little nutrient content.

So wheat seeds and also the white flour made of them are very rich in nutrients, but only in 2 kinds of nutrients, starch and protein.

Animals, including humans, need a great number of essential nutrients in order to survive, around 50 different chemical substances.

White bread provides energy and protein that has a good amino-acid profile, except for low amounts of the amino acid lysine.

For complementary proteins and for the very small amounts of micronutrients that are required for a complete food, one must eat something else.

There exists no natural food that has a perfect composition that would allow humans to live eating only that (except mother milk for small babies).

So anyone must eat a combination of different kinds of foods. People who are rich might choose to eat some paleo diet or some keto diet and it is possible to conceive such diets that are healthy.

However most of the humans must allocate a limited budget for food, and within these constraints there are large areas in various places of the Earth, including Europe, where any healthy diet of optimum cost must include a non-negligible fraction of wheat.

For those who unfortunately suffer of celiac disease, a higher cost of food is unavoidable.