Skin Structure
Skin consists of three layers, each with a different function:
• The deepest layer, the subcutaneous tissue, contains the fat cells that help hold in body heat and protect the vital organs, and that serve as an energy reserve.
• The middle layer, or dermis, is the thickest of the three layers. It is rich in nerve endings, blood vessels, sweat glands and hair follicles. The dermis also holds the oil glands that keep the skin properly lubricated and impervious to water. Two proteins, collagen and elastin, found in the dermis support the skin's top layer and provide shape, tone and flexibility.
• The topmost skin layer, the epidermis, protects the body against the outside world. It contains melanocytes, pigment-bearing cells that determine skin color and help guard against sun damage. The epidermis is also equipped with immune cells that guard the body against foreign substances.
The epidermis is further divided into five separate sublayers. Cells are formed at the basal cell layer on the bottom; they then push their way upward until they reach the surface, called the stratum corneum, in a process that takes roughly 28 days.
As the skin cells mature, they produce a tough protein called keratin, which also forms the structure of hair and nails.

Natural Moisturizers
Do you have dry skin? How well your skin holds moisture depends on the arrangement of cells within the stratum corneum.
Fat contained in this layer, as well as natural moisturizing factor (made by the epidermis), also keeps skin moist. Unfortunately, as you age, the amount of natural moisturizing factor produced by your skin decreases.

Skin Care 101
Obviously, anything that affects the all-important epidermis can dry out your skin-sun and wind both rob skin of moisture.
For starters, just say no to tobacco. Smoking tightens the skin's abundant blood vessels; this reduces the flow of oxygen and nutrients, creating dryness. Smoking also breaks down elastin, the protein that gives skin its flexibility.
The next step is to add water from within. " It takes at least six to eight cups of pure water each day to keep the skin and body well hydrated," notes Jeanette Jacknin, MD, board-certified dermatologist and author of Smart Medicine for Your Skin (Avery/Penguin).

Bathtime Tips
At the same time, be careful about how you bathe your skin. Bathing or showering for too long, or using water that's too hot, can actually cause your skin to lose moisture for two reasons. First, prolonged bathing washes away the oils that help lock moisture in; second, it encourages your skin's own moisture to evaporate after you dry yourself off.

Before you shower or bathe, Dr. Jacknin recommends using a dry, soft-bristled brush to increase skin circulation and gently remove dead cells. Brushing in small circles, gradually move up your legs and arms, always moving towards the heart.
When you do get into the tub or shower, don't scrub your skin and don't use harsh cleaning agents. Instead, go for natural cleansers that feature such skin-friendly ingredients as glycerin.

Feed Your Inner Skin
As your body's largest organ, your skin depends on the nutrients in your diet. You have to feed your skin well if you expect it to stand up to wind and sun. " Eat fish, rolled oats and ground flaxseeds frequently," recommends Dr. Jacknin. "These foods are high in omega-3 fatty acids, which help the skin retain moisture." Include other healthy oils, such as safflower and olive oil, in your meals. Supplemental omega-3s, in the form of flaxseed or fish oils, can also help.

Supplemental Skin
Various vitamins help make your skin happy and healthy. Skin growth and repair requires vitamin A, while natural vitamin E provides antioxidant protection and vitamin C promotes creation of collagen, which provides skin with its structure.

The B vitamins are essential to keeping dryness at bay; without them, the skin can crack, peel and redden. Choline, a member of the B family that helps with fat transportation within the body, is available as lecithin. Methylsulfonylmethane (MSM) is another skin-friendly nutrient. MSM provides sulfur, which the body needs to create healthy skin proteins. It also fights inflammation and encourages better blood flow.

Slake Your Skin's Thirst
A good moisturizer can help arid skin return to soft freshness. To get the most out of moisturizers, use them consistently, and start at a young age. " [M]ost people start to benefit from [moisturizers] in their twenties [when] their skin begins to dry with age," state Charles Inlander and Janet Worsley Norwood in Skin: Head-to-Toe Tips for Health and Beauty (Walker and Company). "Moisturizers boost skin health by preventing water loss from the skin."

The same antioxidant nutrients, such as vitamin C and natural vitamin E, you feed your skin from within also abound in natural moisturizers, as do an impressive variety of herbal essences and essential oils. Aloe vera, used to treat burns for centuries, helps ease inflammation, as does chamomile. Fresh-smelling lavender oil helps soothe insect bites and minor wounds. Jasmine and peppermint offset excessive oil production.

Moisturizers: Timing and Type
The ideal time to moisturize is right after a bath or shower, since that's when evaporation promotes water loss; for best results, apply while your skin is still slightly damp. But bathtime isn't the only time to consider your skin's moisture needs. Carry some moisturizer with you so you can use it every time you wash your hands, especially if you're prone to cracked cuticles and split fingertips.

Match your moisturizer to your skin type. If your skin tends to oiliness, use a water-based product; otherwise, an oil-based formulation -jojoba oil and shea butter are good choices-is fine. (Oily skin may first need a gentle astringent like lemon peel or cucumber to remove dirt and excess oil.)

Also pay careful attention to the type of moisturizer you use. Lotions are easy to apply, but may not stay on your skin as readily as creams, which may be a better choice for your face, feet and hands. By all means, enjoy the summer sun. Just make sure your skin enjoys the summer, too, by staying hydrated and happy.