Just replying to agree with everything Trishinator wrote. I've struggled with being over 300lbs for years since I quit smoking, and I thought hard diets were the way to go. That is, until I learned about MBR calculations. Evidently, I'm supposed to eat almost 3600 calories a day to maintain my weight, and 3100 to lose weight. Once I spread that massive caloric intake out through 5 meals, and started a healthy cardio AND weightlifting program, I started to see results. I started at 365, and now I'm down to 325, but it's a LEANER 325. The weight doesn't melt off, it creeps off very very slowly. But I can see pictures from 6 months ago where my shoulders and arms aren't nearly as big as they are now, and my calves and forearms show off the hard work I've put in, even if my midsection still bulges. But I'm never going to have a six-pack. I'm not built that way. I doubt I'll ever see the south side of 200, considering I'm 6'2" with 8.5" wrists. (they use wrist circumference on the BMR calculator to gauge your frame) Just like I'm never going to be a marathoner. But I've already run 6 5ks in 3 years, and even though I'm slow, I'm faster than everyone standing still, and everyone still cheers me on as I lumber across the finish line.
If you find yourself in a running rut, try mixing up weights with your cardio. A strong, healthy core is just as important as lung and heart function to runners.
This has been a long post from someone who mostly lurks, so I'll leave y'all with three truths I've finally learned after years of struggling with weight:
1. Food is fuel. You get out what you put in, and that's no joke. "Garbage in, Garbage out" is not just a clever phrase.
2. You can't burn fat without muscle. A simple weight routine, even just situps and pushups if you don't have weights, is essential to keep your body burning fat efficiently
3. If it doesn't CHALLENGE you, it doesn't CHANGE you. If I'm not gasping for breath after that last mile, or exhausted from that final rep of my last workout set, then I didn't give it my all, and I'm only cheating myself.
Good Luck, and DON'T QUIT. Even if they're not right beside you, know that when you're out there on the trail/path/treadmill/gym, that you've got people rooting for you!
Major Setbacks - Willpower, muscle retention.