V.H.POTTY
http://vhpotty.blogspot.com/
http://foodtechupdates.blogspot.com
There is a mistaken belief amongst the house wives that once a food is shoved into a refrigerator, it is safe and and its nutrients are 100% protected. Contrary to this perception, many studies have brought out the reality that food being a perishable substance can lose its nutrients continuously whether held at room temperature or in the refrigerator, the only variability being the rate of destruction under different conditions. Natural biological substances are rich in a variety of enzymes, which can decompose the nutrients into biologically unusable artifacts.
"In a recent study at Arizona State University, Prof. Carol Johnston found that the vitamin C in orange juice declines rapidly after being opened, even when refrigerated. "If you pour your glass of orange juice and have it sit a few minutes or so before you drink it, you're going to have losses even at that point," she said. In fact, frozen orange juice was shown to have twice the amount of vitamin C per cup as the ready-to-drink juice. "I think, consumers need to realize frozen is good when it comes to maintaining nutritional quality," she continued. Green tea can lose 32 percent of its antioxidants after six months if not stored properly".
Nature's own packing is the most efficient one and as long as there is no human intervention affecting the integrity of the cellular system in plant based foods, the nutrient destruction can be kept to the absolute minimum. Of course there are some instances where food technology has evolved stabilization and nutrient fortification technologies that improve the nutrition value of processed products compared to the raw material. It is not often realized by those critics who brand frozen foods as old and stale that freezing is the best known process to retard all chemical and biochemical reactions and it can be almost equal to its fresh counter part in terms organoleptic quality and nutritional content.
Much was made of the voluntary efforts by a few major food business players to come out with a consumer guidance system that can be printed prominently on the label, obviating the need to take pains to read the nutrition content of each and every label on different brands of products on the shelves. Thus was borne the much hyped voluntary "Smart Choices" symbol evolved in the US earlier and immediately adopted by some of the manufacturers. Now it turns out that many products with no credentials to be called nutritionally good, were able to get the symbol attracting strictures from the authorities and subsequent withdrawal of the system.
"The Smart Choices logo began appearing on food packages this summer but immediately met with criticism from some nutritionists who felt its criteria were too lax. They pointed to sugary cereals, like Froot Loops, and fat-heavy products like mayonnaise, which they said should not be considered among the healthiest choices in the supermarket. The first ingredient in Froot Loops is sugar. The F.D.A. sent the program a letter in August voicing concern that the label could lead consumers to choose highly processed foods over healthier foods, like fresh fruits and vegetables and whole grains".
It is unlikely that any single mechanism can be put in place to categorize foods based on nutrient content and health considerations. Food is a complex organic matrix and any processing is bound to affect its natural equilibrium to some extent. Our knowledge about impact of various processing techniques on different varieties of foods is still incomplete and prediction based on such limited data cannot be considered reliable. It must be born in mind that quantitative values of different nutrients, present in a product,do not reflect the quality of the final product.