It's individual for everyone but I would say a 1600 calorie eating plan plus working up to 45-60 minutes of exercise daily (5 days/week) would have you losing about a pound or two a week.
Eat 4 fruit servings, 5 veggie servings, two 4-6 ounce portions of protein, 3 "bread-like carbohydrate servings," 2 fat free dairy servings and 3 servings (each 50 cal) of a healthy fat DAILY. You can work out whether you want 3 solid meals and 1-2 snacks or 5-6 mini-meals.
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