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    Feed your turtle a balanced diet.Your turtle should eat a balanced diet comprised of fruits, vegetables, and meat. If your turtle is aquatic, its diet should be 65% to 90% meat (e.g. earthworms, snails, mollusks, frozen pinkie mice, dried turtle food/pellets) and 10% to 35% vegetable based (e.g. mustard or collard greens, grated carrots, grapes, mango, cantaloupe). If you have a box turtle, its diet should be 50% meat (crickets, mottled mealworms, slugs, snails) and 50% vegetable based (e.g. berries, green beans, winter squash, flower heads).
    • Young turtles need more meat than more mature turtles.
    • These are general rules for turtles, but the diet will vary depending upon the species of your turtle.
    • Always feed your turtle fresh foods.
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    Supplement diet with calcium.Your turtle should get all the vitamins and nutrients it needs if you provide a well rounded diet. However, most turtles will benefit from calcium supplements. You can supplement calcium by giving your turtle calcium blocks, cuttle fish bone, or powder. Give your turtle supplements once a week.
    • Place the calcium blocks or cuttle fish bone in your turtle's habitat for you turtles to gnaw on them.
    • You can also coat your turtle's food with calcium powder before you give it to them.
    • You can also give your turtle a reptile or turtle multivitamin twice a week.
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    Know which foods to avoid.Your turtle will thrive if given a variety of foods in moderation. However, there are some foods that you should never give your turtle. Avoid the following foods:
    • All milk products (e.g. cheese, yogurt)
    • Candy, chocolate, bread, refined sugar and flour
    • Canned and processed foods high in salt and preservatives
    • Anything in the onions and garlic family
    • Rhubarb
    • Avocado
    • All fruit seeds

Source:wikihow