Your body is amazing. 

Every cell in your body performs 24 hours a day, protecting the delicate internal structures from injury, environmental pollution and infection.
Emotional stress, physical illness and allergic reactions can have a dramatic effect on your appearance and on the way you feel. When you are well your energy shines through and you naturally become more attractive.
We can't get away from the fact that too much junk food, computer time and lack of sleep are bound to add up to disaster sooner or later, while pure water, fresh vegetables, exercise and sweet dreams should keep us healthy. Having said that, in these times it's often difficult to stick to a diet that delivers all the nutrients we require.
The skin needs nutrients too. Sun damage is caused by overexposure and made more likely if you smoke or drink alcohol. These habits destroy antioxidants which are essential to protect the skin from oxidant damage (otherwise known as sunburn). When abroad in a sunny climate apply sun protection often and eat fresh local fruit, naturally high in antioxidants, to help fight sun damage from the inside out.