Taken over by the media, hoping to rejuvenate skin through proper Food is now widespread. But scientifically, if the results of studies in vitro and in animals are moving more in favor of a preventive role of certain nutrients, nothing has yet been demonstrated in humans.
Some foods are presented as true cosmetics "internal" can delay Aging Skin. However, all data that allow for this reasoning comes from studies performed in vitro (in cell culture dishes) or in animals. Furthermore, very little analysis allows extrapolation to humans. Yet many Europeans, including over 35 years, using food supplements. Indeed, the interests of associations of minerals, vitamins and fatty acids is their anti-radical (activation of defense systems) and their effect on cell proliferation, two key phenomena Aging.
Demonstration: the example of zinc
In test tubes, zinc promotes the proliferation of skin cells, their differentiation, stimulates production of collagen, elastin and helps to eliminate some toxic elements. All these actions occur in the aging process. But in vivo in humans, nothing has been proven, except for a decrease with age in the stock of zinc. However, in zinc deficiency there is actually impaired wound healing, a Hair loss and nails, events that are also signs of aging and strengthens the supposed protective role of zinc. So the convergence of in vitro studies and some deficiency symptoms similar to those of aging tend to push to zinc supplementation or consumption of foods rich in zinc (seafood, meat, cereals).
In addition, nutrition programs and health of INSERM begins to integrate the role of Nutrition in Aging skin. Indeed, the gradual reduction from 35 years Vitamins Minerals and legitimizes the idea of preventive supplementation.
Finally, the indirect evidence for an effect of nutrition on aging are numerous, but in no case do they answer the question of rejuvenation. We can therefore speak no more than a preventive role, but remember that the key is "good food be fit and stay long.
