Please explain this net calorie thing

So I'm confused my calorie goal is 1200 I put in my food intake for the day and I had 150 cal remaining for the day then I added my daily exercise and now my total calories left for the day are over 600. So will I lose weight if I consume the extra 600 calories or should I pretend as if I only have 150 left....

The caloric deficit is built in to your net calorie goal. That's why you told mfp what your general activity level was, and why you told it how much you would like to lose per week. That's all baked into that calorie goal it gives you. If you exercise, you're creating a larger deficit, so you can eat more and still expect to maintain that initial deficit.

That's the beauty of MFP. If you're more active one week and less active another, you can vary your eating to keep the weight loss steady.

it probably depends upon your age. as we age our metabolism slows down. so my nutritionist told me that if i want to lose weight steadily I should not eat the extra calories that i "earn" back.

MFP includes a built-in daily calorie deficit whether you exercise or not. On days you DO exercise, you need to eat back your extra earned calories to maintain the same daily calorie deficit.

Read this http://www.myfitnesspal.com/topics/show/818082-exercise-calories-again-wtf

it probably depends upon your age. as we age our metabolism slows down. so my nutritionist told me that if i want to lose weight steadily I should not eat the extra calories that i "earn" back.

This.

Everyone is different. Some folks on here swear by eating back all their exercise cals.. I don't myself, some days I do, some I don't. I eat to meet my nutrient goals for muscle gains, macro goals, nothing else.

I've only been on this journey for 4 weeks now starting at 40yrs old, 111kilo's, 175cm tall i've lost close to 6 kilo's only eating some if not any of my exercise calories, 1500 calories is my sweat daily goal spot for weight loss it seems. I exercise 5 days a week for 60mins a day burning an average of 800 a day and eat very few of those back, i do stock up on protein b4 and after the workouts and the rest of the day is generally fruits, vegetables or salad and lots of water and some form of protein/carbs.

My dad at 66yrs and around 90kilo's works harder then i do in the same exercises and only burns around 500. he also eats far less then i do, he's a type 2 diabetic and doesn't believe in the eat more not less mantra plus he has to watch his blood sugar levels etc., subsequently his weight loss stalled months ago but he's still pretty fit for someone his age who's has high blood pressure (as do i), type 2 diabetes and has had a quadruple bypass from a rare heart malfunction.

Goes to show too that even the fittest people can get "fat people" diseases and symptoms.

Anyway i'd say do what works for you, not what others tell you you have to do. If eating them back works better then good, if not eating them works and you aren't depriving yourself then thats ok too. and obviously as you get closer and closer to the ideal weight and BMI for your age/height bracket it would be easier to eat any calories back given it would be probably be a much smaller amount based on less weight = less calories burned and less energy needed.