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I am a UK postman. I wear a Fitbit which tells me I walk around 30,000+ steps a day, sometimes more.

However, I don't seem to be losing weight. I log my food and its seems I am always 2000+ calories left to eat. I mainly eat well with the occasional boost of the naughty stuff. I am 46 and my rhr is about 57/62

Could I be putting my body into starvation hence the lack of weight loss?

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  • You have 2000 calories left to eat? Kilocalories or calories? A normal diet is 2500 kcal. This means there is either a problem with logging food (you would definitely have major consequences from only eating <500 kcal) or you always reach the limit with only 2 kcal or 2000 calories left. – Narusan Jun 13 '17 at 14:41
  • Yes. See update. I have tried with other measuring devices and end up with the same figures... more or less. – user33232 Jun 13 '17 at 15:30
  • How do you know that you have 2,000 calories left to eat? – Narusan Jun 13 '17 at 15:31
  • Because I make a food diary using fitness pal scanning all food eaten. Yesterday I hate 2500 calories minus 4702 as shown on Fitbit leaves about 2000 – user33232 Jun 13 '17 at 15:38
  • Watch out! You usually eat 2500 kilocalories, not calories. Usually [this is experience] sport does not lead to loosing weight, only eating less does. You are consuming 2500 kilocalories and burning 4 kilocalories, if all units are correct. – Narusan Jun 13 '17 at 15:40
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Calorie estimates from fitness trackers such as a FitBit are extremely unreliable, to the point where descriptions such as "wild guess" are reasonable. For example, a recent study found errors of between 30% and 90%, with walking being the form of exercise with the highest error rate.

At a guess, I'd say the reason you're not losing weight is because the FitBit is overestimating your energy burn by about 2000 kcal a day. 5000 kcal a day is typical for someone engaged in heavy physical labor (eg. digging ditches).

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I can't post comment yet, so I will post it as answer.

Calories estimates are for reference only and that is nowhere accurate at all. Your body consumes calories even at rest, our body requires calories to operate at all time(heart-beat, respiration, etc.). I am going to say what all people say about weight losing strategy. Obviously the application you are using is misleading and the most effective strategy to pay attention to what you are going to eat.

"Do sports and do not eat more than you need".

As a postman, I can imagine you walk with a heavy bag every weekday, but the main factor in consuming your own calories is the intensity of your activity, you can walk slowly or in normal speed for 1 hour, the calories burnt/used are nowhere near race-walking for 30 minutes.

I mainly eat well with the occasional boost of the naughty stuff

This could be a problem, if you boost yourself with naughty stuff in short interval between diet and assuming that naughty stuff is a low quality calories food, you are not going to lose weight. Your body will store extra calories when you have more than you need, low quality calories provides high calories and does not fill your stomach well enough. If you are hungry, try something else.

If you wish to lose weight, then pay attention to nutrition label, not only the calories, but the other nutrition like fat and sugar. Usually you won't find nutrition label in restaurant, but you should be able to determine what is good and bad for your nutrition goal. You will be more experienced as you try, I managed to go from 40" belly to 34" in a year by myself using the same strategies I typed. Resistance training can help too, but for this topic, you look for information in relationship between nutrition and resistance training.

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