For good skin and a glowing complexion you need a healthy lifestyle, which means getting enough sleep, exercising and giving up smoking.
Of course, what you put on the inside determines how you look on the outside. Here's what to eat for soft, supple and younger-looking skin...
What to eat for great skin
Avocados are also packed with nutrients, including protein, beta carotene, potassium, folic acid, B vitamins, Vitamin K and magnesium and Vitamin E, which helps protect against free-radical damage.
Experts believe the oil in avocado also encourages the skin's production of collagen, a substance that helps skin maintain its elasticity and youth.
Not only are they bursting with antioxidants, which neutralise harmful free radicals that cause ageing, including wrinkles and sagging skin, they are also anti-inflammatory, helping to keep the complexion free of fine lines.
Blueberries, just like raspberries and strawberries, are high in vitamin C, which helps protect the skin from the harmful effects of the sun.
Brazil nuts also contain zinc, which helps with skin cell growth, and can help prevent dry skin related problems such as eczema and psoriasis.
Eating just four Brazil nuts a day will provide the recommended daily amount of selenium. Don't like nuts? Other good sources include shrimps, fresh tuna and sunflower seeds.
Fruit and veg contain vitamin C, one of the most powerful antioxidants. Colourful foods, such as citrus fruits, red peppers, guavas and kiwi fruit are all great sources.
Betacarotene, found in pumpkin, carrots, and sweet potatoes, and lutein, found in kale, papaya and spinach are also powerful antioxidants.
The magic ingredient is polyphenols, which have anti-inflammatory properties and help protect cell membranes. Studies suggest it may even help to reduce the risk of skin cancer.
A recent study published in the Archives of Dermatology suggests that whether taken orally or applied to the skin, green tea can reduce the risk of damage from ultraviolet light, and thus reduce the risk of skin cancer.
It's even more important to eat dairy foods rich in vitamin A if you have diabetes or a thyroid condition as the body can't easily convert beta carotene (found in foods like carrots) to vitamin A.
Low-fat yogurt also contains acidophilus, the 'live' bacteria that is good for intestinal health, which can also help keep skin blemish free.
Eating one serving of red meat once a week should be enough to ensure your skin is getting the zinc it needs.
Don't like red meat? Other zinc-rich foods include wholegrains, wheatgerm and shellfish.
Salmon is also rich in Vitamin A, Vitamin B and Vitamin D, which help fight against free radicals in the body, preventing the effects of ageing.
Bored of salmon? Try mackerel, sardine or snapper fish, which is also a great source of selenium.
Not only do they release energy slower, keeping you fuller for longer, they can also help ensure a smooth and supple complexion.
In his book Seven Secrets to Beauty, Health and Longevity, Dr Perricone suggests that eating high GI foods, such as biscuits and sugary drinks are best avoided, as they can lead to over-production of insulin, which damages the skin's collagen and accelerates wrinkling.
As well as keeping cells hydrated, water helps the body move nutrients in and toxins out, which helps keep skin clear from blemishes.
Aim to drink six to eight glasses of water a day, particularly in warm weather. Check your urine - if it's a dark colour it's a sign you need to up your fluid intake.
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