Wow! What a question! This is such a broad topic, I could stand here for days and still not cover it.
First, go to your doctor or a nutritionist. This is crucial to answering your question, and probably only the only way to get a good answer for you.
Second, do your own research! People who have certain life styles have to focus on certain things to eat, I.e.- athletes on protein and good fats. There's such a complexity towards finding the right diet for the right lifestyle that only you and your doctor, or even a nutritionist, can tell you what's right.
Good nutrition varies from person to person, with varying factors such as age, weight, and health conditions. However, general good nutrition can be characterized as such:
Low amounts of saturated fats
Lower amounts of standard carbohydrates (sugars), such as fructose
Higher amounts of unsaturated fats, such as omega-3
Good amounts of complex carbohydrates, such as fibre
Approximately 1g of protein / 1lb of body weight per day
A good mix of vitamins and minerals
Approx. 6 eight-ounce glasses of water per day
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