Should I eat my negative calories back?

Depends, really.

If you're not hungry, tired, or cranky, then you don't HAVE to eat them. But if your total calorie deficit is too high, that can be unhealthy, too. My general advice is to "net" your BMR at least. So, if MFP gives you 1400 calories to eat (and your BMR is 1300). Then you exercise for 200 calories, bringing your "net" for the day to 1200, I'd recommend eating at least 100, so your "net" is equal to your BMR.

MFP from your selection of non-exercise daily activity x your BMR came up with a daily maintenance figure. Eat this with no exercise you maintain weight. Obviously an estimate.
Say 2000.

You selected a weight loss goal, say 1 lb weekly recommended.
So 500 calorie deficit to your maintenance.

2000 - 500 = 1500 daily goal when no exercise.

You exercise for an hour, and correctly log it, and you burned 500 calories for an good hour.
Your literal maintenance for that day just increased.
2000 + 500 = 2500

Now MFP takes the same deficit off.
2500 - 500 = 2000 eating goal.

You have the same deficit in place, and you eat more, when you actually do more.

If you think that a bigger deficit is bigger - then why don't you just stop eating until the weight is gone?
Because you realize it's not actually better in the long run.

Neither is a bigger deficit better in the long run, or even the short run for many people, especially if you have just gone nuts on the exercise compared to what you used to do before.

Also, while at the start of exercise you can do much wrong and still see improvement, you can see more if your body has something to work with to actually make improvements.

Called fueling your workouts.

Eat the exercise calories back, even if people say it's inflated.
Those exercise days will make up for probably selecting too big a deficit on the other days.

Hi, I have a questions regarding the calories you burn during a cardio exercise. Every time I go to the gym or do some sort of Cardio exercise, those calories I burn transfer over to the negative calories, thus I end up eating some if not all the "negative" calories back.
After having a conversation with one of my friends, who also uses MFP, I was told that I should not eat those back, try to keep my goal calories and not adding the negative calories.
I need your opinions on this: should I or shouldn't I eat the Negative Calories back??
Thank you.

I don't eat mine back.

Daily Calories: 1500
Exercise: 3-4 times/week
No food Scale, estimate only
I measure the calories burned using the MFP app.

Thanks.

I agree, buy a food scale. Estimates are okay if that's all you can do (e.g. at a restaurant)--better than not tracking. But, you are likely eating way over what you think. Also, I recommend against eating any of your exercise calories and only eating some of them if you're really hungry because that is also not entirely accurate. Otherwise, you're not likely to lose, you're more likely to maintain.

Hi. This is not an easy answer, because it varies widely from person to person. I personally do not base my calories burned on MFP. I record them at the gym and keep them as a memo in my phone, and then manually add my calories in when I get online later on in the day. I find that some exercises are inflated and others are pretty accurate. And some exercises are underestimated on MFP too, or at least when I compared. So it can go in either direction if you're just going by what MFP says.

So some people have found that if they eat back their exercise calories, this helps them more. There have been people on here who hit plateaus and started eating their calories back, and then began losing again. Other people find that eating all their exercise calories back does not help them, so they only eat some or half, or 80% back.

So I think it all depends on you. I think it can depend on your inensity and duration of workouts too. Obviously you need to eat more on a day you exercise for 2 hours as opposed to 45 minutes, or days where you do high intensity verses a 30 minute walk around the block. Also, active jobs make a difference too.

If you're hungry, tired or cranky, like someone else said, then yeah, you should eat some of your calories back.

Me personally? It depends on the day and how I'm feeling. I eat in between 1200-1600. Higher intakes are with higher calories burned at the gym or a more active day; 1200-1300 is normally reserved for less active days, but again it still varies. I normally eat some of them back but not all. I am usually hungry in the evening so I do eat some kind of snack.