How can i use diet and lifestyle to get a clear healthy complexion?

Avoid oxidation: Skin is damaged internally and externally. Free radicals are the bad guys. Avoid sun (tons of free radicals produced), smoking introduces millions of free radicals, food allergies, infections and hormone changes all affect skin. Eat low glycemic foods, avoid smokers, use defoliants, supplement diet with anti-oxidants, increase protein intake, decrease carbohydrate intake and use sunscreen everyday.

Wrong question: Diet & lifestyle are very important for other reasons. If you are not happy about your skin, see a dermatologist to define any abnormality and determine the best way to correct any problems. Don't smoke or abuse drugs. Eat your vegetables. Get exercise & sleep. Don't get sunburned. Multivitamins are greatly over-used to the profit of those who sell them.