I've been "struggling" with my weight since I was younger. I lost about 20-25lbs after college doing the South Beach diet and exercising (which I had always done). Then I've been just trying to get in shape and have gone up and down about 10lbs in the last few years. I'd like to be down ~8-10lbs, so this is the last few and I know that's hard. I'm a normal weight for my height although slightly to the upper end of the range. I eat healthy as I learned a ton of great habits from the SBD (and also just "how" to eat the right way and make the right choices). I slip on the weekends like a lot do, I still drink on the weekends and allow myself the occasional treat. I've recently started running and training for a 10K. I'm afraid I just don't know how many calories I should be eating. I see some people who run a lot eating 2000 calories and they're so skinny. I have been eating around 1200 calories a day during the week, and on the weekends "eat whatever" but try to make good choices when going out- I'd say I maybe average 2000 on weekends? My workout routine is 6 days a week, mix of running and strength. I've seen a nice difference in how my body looks since I started the strength training but see no drop on the scale (I know, muscle weighs more than fat). This is what it looks like now: M- long run (4+ miles, should top out at 6 until I'm half marathon training in the winter) T- 50 min mix of elliptical/bike, abs & stretching W- Body Pump class (60 min of weight lifting, usually 100 reps on a dumbell per body part, low weight like 10-20lbs on the bar) R- 3 mile run F- Body Pump class S- either 60 min body combat class or 3-4 mile run S- rest Am I not eating enough? I'm afraid to bump my calories and see a gain! How do you know how much you should be eating? Sparkpeople tells me 1600-1900 but that seems so high to me.