On the contrary, often there are recommendations absolutely opposite. So, for example, around the world scientists-nutritionists persistently to replace part of butter with much cheaper vegetable, and part of high-grade bread — a rough grinding.
The science explains, in what combinations and quantities, in what culinary processing foodstuff is optimum for activity of an organism. But any scientist does not claim that expensive food in all cases is more useful and more necessary more available at the price.
Everyone should at least elementary in food, in products, in their. Without it there is no cultural life, without it, even at abundance, it is difficult to keep health, working capacity, cheerfulness and a of life to extreme old age, to strong, physically and spiritually strong.