Today more and more talk about useful diet and how to choose the desired product from such a large number of manufacturers? Looking at the content, we draw on the so-called opinion E, or as they are in another call - Preservatives. And increasingly difficult to find products without these preservatives. Why did before and without them and all was well, and above all live longer, healthier, and in outpatient queues were not expecting? The fact is that in today's active time, and also in terms of economic integration nothing else is possible, as canned goods for a long time. For now the whole world eats bananas from Ethiopia, lobsters from Norway, and caviar from Russia. But except for the duration of delivery need to purchase the goods may be in advance. And in Russia prefer to buy caviar, to feast on her Christmas holidays. What should be done in this case the producers? Allow yourself pickle eggs are only people living near the place of catching such a delicacy. And everything else the world had to eat caviar with preservative. Because the preservation of this delicacy - a delicate exercise and cleaning products from living organisms are not allowed. Thus, it was invented to utilize two main types of preservatives - Е200 sorbic acid and methenamine E239. These substances are completely different in its effects on the body. The first long-studied and fairly harmless preservative. With its antimicrobial properties, was adopted by wonderful man, the taste of the product does not change, and allergic reactions almost is. A second case is different. Methenamine particularized in the calf of the substance. He invented only for preserving eggs, but it is far from harmless. When sorbic acid improves its bactericidal property, adjoining the salt, then methenamine even in acidic and neutral medium decomposes, creating an unsafe formaldehyde. It turns out that modern man must choose between the shelf life and its quality. Since caviar, made without preservatives, can save the properties no longer than 4 months old. But the caviar with sorbic acid will delight gourmets throughout the year. It is important to a healthy balanced diet during pregnancy. Products used by pregnant women, should be natural, fresh and should not contain any preservatives.