it might be one of those things that are very individual
three years ago I decided to keep track on my calorie intake as I had no idea what I was taking in on a daily basis, also weighed my self daily- I did this for about 45 days
I was trail running 4-5 times a week (30-ish miles) and strength training twice a week, just about what I'm still doing today
one my weight never fluctuated more than 3-4 lbs over the entire 45 days, my caloric intake was pretty high 3500-4000 calories/day (sometimes more)
after that little "experiment" I didn't pay any attention to calories, just trying to keep it somewhat healthy (several servings fruit/veggies per day, leaner meat as a general rule, cut back on processed foods)- I still will eat pizza, cheese burgers and the like, just not too much
my weight still only varies a couple of pounds here and there
