Us fatties have a higher calorie expenditure. For a 200lb runner you can expect to burn off around 400 cals per 30min run at 10-11mins per mile. Which isn't bad at all.
If you were to run (4 * 30min) runs per week, that is a burn of 1600 cals per week.
A sensible 1600 calorie a day intake provides a calorie deficit of 3000 cals per week.
3000cals + 1600 cals = 4600cals
With 3,500 cals per pound of fat, you could expect a weight loss of 1.5-2 lbs per week.
You will not only feel fitter, but also look better. And to top it all off, the more weight you lose, the faster and easier your running will become.
But a word of warning! But don't subscribe to the "all calories are good calories" philosophy. Alchohol and High GI (Glycemic index) foods won't fill you up for very long and play havoc with your blood sugar levels.
Stick to low to medium GI foods, with a hearty helping of protein. And you will feel full for longer.
However, If you start to notice that your times and performance deteriorating after a few weeks. It may be worth taking a few days rest, upping your calories, and checking to ensure you are not vitamin deficient. Take "1 a Days+iron" for about a week and see if that makes any improvement.
For runners the main culprit are deficiencies in:
Vitamin B6+B12 - Cracked lips, or splits at the side of your mouth
Iron - Feeling of lethargy during running, and slower times even at maximum effort.
I have suffered from both in the past and can testify to how debilitating they can be!
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