Diet
I feed my rats Mazuri lab blocks (formula 5M30), fresh fruit and veggies, and Nutro Natural Lite Kibble.
Some excellent lab block brands that I reccomend are Harlan Teklad and Mazuri.
A popular homemade rat diet is
Subee's.
For a table of minumum daily nutrient requirements for a grown adult rat, go here: 
RMCA Article

Growing ratties, pregnant/nursing females, and rats who need to gain weight need a higher intake of protien and fatty foods. I like to feed high protien dry dog kibble (Eukanuba , Iams, puppy food), fresh cooked meat, and I know some people like to feed their rats mealworms as an occassional treat or for protien. I personally don't feed mealworms, though that's cause I don't like them.

Forbidden foods:

Uncooked tofu
Uncooked sweet potato
Carbonated beverages (rats can't burp)
Green bananas
HSH Awesome Flite, bred by Hannah, Home Squeak Home and owned by Holly, Charisma Star Rats
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Diet
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HSH Rattery
Email: clickertricks@yahoo.com