this is a good question, i'm a big runner.
Questions to ask yourself:
1.What portion size of the food your eating? im sure its pretty good.
2. Have you ever done a calorie calculator to see how much calories you need to intake each day? (what it says you should eat each day in calories to maintain the current weight you have, maybe take off 250)
3. have you looked at a b-12 complex vitamin to boost metabolism? (you may want to ask your Doctor before taking it if you think it will effect your body in a bad way) (i take one every day)
4. If you eat small meals, eat small snacks between meals to keep your metabolism up. I've read eating 5 small meals a day is better then eating 2-3 larger meals a day.
5. Water intake, drinks can effect metabolism
6. Sleep more. sleeping boosts the healing process (also the more your sleeping, the more your not eating)
Now when it comes to your running pre and post workout snacks are a good idea. Drink Chocolate Milk after a work-out. The carbs and protein in milk will help with what you the carbs and protein lost from running. It does wonders, even though when people hear chocolate they step back thinking to theirselves, "that's bad stuff", but actually studies have shown drinking it after a workout is probably one of the best things for you. maybe 8oz-10oz about 30-60 min after your workout.
Pre-workout, something like a banana, peanutbutter on toast, or a fruit or veggie smoothie is a good idea. gives you good energy. Coffee is also a good one, keeps you focused, and energized. Coffee starts working 30 min after intake, and is working its hardest at the 2hr mark.
When it comes to the quantity of your running, how far are you going each time you run? Are you sore after your running? What is your average pace per mile?
Last Note, i would give it a couple more weeks to see results.
Anything further you would like to ask just message me, I hope this helps you! I love to see people wanting to be fit and also be runners like myself!