CONFUSED: Earning Extra Calories?

You want to 'net' above your BMR, otherwise you should be fine. There's some strong opinions on eat calories back or don't. If you don't, you lose quicker at first, but will slow down. If you do you will probably have more consistent results but with either you also want to ensure you are getting the nutrition you need to maintain that loss. If you feel tired you probably aren't eating enough for what you're burning. I eat back what I burn about 50% of the time, just works out better in my head and helps me to have 'cheat' days.

Personally Im skeptical about all this from my own experience I could not live on 1200 cals a day even if I lie in bed all day which I dont,if I walk 8 miles a day and run 5 k God knows how many exercise points I will clock up so I would be given about 2500 calorie allowance I always eat between 1500-1700 cals a day no matter what I do I couldnt then consume my extra calories! so wheyeher I should or not I couldnt! i suit my needs not what it says I should!

the default setup on mfp is that yes, if you exercise and burn X calories, then you eat X calories back. a calorie deficit is already set into your calories for the day. so consider your exercise as a tool to help attain the body or cardiovascular fitness level that you would like to attain, not as the primary method of achieving a calorie deficit.