Dr. Oz goes back to school to fight teen obesity -a national problem that has reached epidemic proportions. Along with his HealthCorps team, Dr. Oz is committed to getting America's teens back on the right track.

Dr. Oz checks back in with a group of students from Brooklyn, New York's New Utrecht High School. Are they headed toward health and fitness, or are they stuck in their old ways? Here, see how the students have progressed and pick up a few tricks on how to reformat your after-school snack plan. Click here to get Dr. Oz's After-School Snack recipes.

Click here to see Part 1 of the follow-up and watch HealthCorps mentor Jake perform a surprise snack inspection at two of the students' homes.

Click here to watch where it all began and learn more about the students and their personal struggles with diet and exercise.

Learn what you and your family can do to make better food and lifestyle choices. Take Dr. Oz's Healthy Family Challenge now!

Are you inspired by this group of student's commitment to better health? Learn from their successes and apply their strategies with the Dr. Oz School Challenge Cheat Sheet.

Q: I end up overeating because it makes me feel better and I never really get full. I'd like to lose weight but this makes it hard. Any suggestions?

A: Being persistently hungry can cause big trouble. So can overeating for comfort/pleasure. These two behaviors, say researchers from Baylor University's Children's Nutrition Research Center, are controlled deep within your brain by serotonin-producing neurons, but operate separately from each other — one in the hypothalamus, the other in the midbrain. They both can, however, end up fueling poor nutritional choices and obesity.

Eating for Hunger

When hunger is your motive for eating, the question is: "Does your body know when you've had enough?" Well, if you are overweight, obese or have diabetes you may develop leptin resistance and your "I am full" hormone, leptin, can't do its job. The hormone's signal to your hypothalamus is dampened, and you keep eating.

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