There are numerous enemies of our skin in our living environment. You may know some of them and not notice others. The hottest and most well known enemy to our skin is probably free radical. Free radicals are molecules and atoms produced during normal metabolism, which are highly unstable. The unstable molecules tend to combine with stable substance.
The effect of the combination of unstable free radicals to skin cells can be “disastrous”. Skin cells become injured and irritated and different cell parts, cell walls ad collagen fibres may die. But, young and healthy defence system can scavenge and neutralize these free radicals.
Though our natural defence system can neutralize the free radicals, there is a limit. That means such natural defence system cannot neutralize all the free radicals if there are too many. The free radicals from air pollution, cigarette smoke, pesticides, poor diet, illness and stress finally cause our skin to be dry, sensitive, inelastic and unhealthy.
Sunlight is the other big enemy to our skin and yet it is unavoidable. The UV radiations damages protein fibres, thickens the epidermis and can cause skin cancer. Heat from the sun also causes moisture loss in skin, leaving it dry and sensitive.
There are many other sources of heat (e.g. central heating) other than heat from the sun. Heat from the whole environment causes moisture loss when water is evaporated. Not only heat, cold air (e.g. from outdoor and air conditioning) may also cause dehydration in skin. Skin’s normal sebum and moisture production cannot compensate this type of moisture loss. Therefore, special skincare may be required.
Skin is not only affected by external factors, but also internal ones. One of the most affective factors is hormone. Sebum production and moisture level of skin in human body are largely dependent on hormone. For example, Oestrogen is a natural humectant of skin. Because Oestrogen decreases as we grow older, our skin become dryer as we grow older, too.
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