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"Eat back half your exercise calories"
CattOfTheGarage
Posts: 2,745 Member
I see a lot of people saying "eat back half your exercise calories" or "eat back a third" or whatever. Am I the only one who thinks this is a super complicated way to approach things? Seems like it would involve a lot of mental arithmetic at the moment of deciding whether to eat something or not.
If I'm worried mfp might overestimate exercise calories, I just enter fewer minutes - so maybe I walked for 20min but I'll only enter 15. That way I can still just look at the calories remaining and know whether to eat the thing or not. No on the spot mathematical gymnastics.
Anyone else? When you say "I only eat half my exercise calories", what do you mean? Do you enter half the minutes or are you always juggling the numbers from your latest workout in your head? I feel it could be helpful to get this clarified, especially for beginners.
And a related question: what is your basis for thinking mfp overestimates burn (as opposed to users overestimating intensity or length of workout)? I've seen a lot of people say it but I don't know what they're basing it on. Fitbit readings? Experience with slower than expected loss? Personally if I under-log exercise it's because I reckon I overestimate intensity or time - my own experience has not pointed to any issue with mfp's numbers for exercise. But then I eyeball my food, so I can't use my results as scientific evidence of anything.
If I'm worried mfp might overestimate exercise calories, I just enter fewer minutes - so maybe I walked for 20min but I'll only enter 15. That way I can still just look at the calories remaining and know whether to eat the thing or not. No on the spot mathematical gymnastics.
Anyone else? When you say "I only eat half my exercise calories", what do you mean? Do you enter half the minutes or are you always juggling the numbers from your latest workout in your head? I feel it could be helpful to get this clarified, especially for beginners.
And a related question: what is your basis for thinking mfp overestimates burn (as opposed to users overestimating intensity or length of workout)? I've seen a lot of people say it but I don't know what they're basing it on. Fitbit readings? Experience with slower than expected loss? Personally if I under-log exercise it's because I reckon I overestimate intensity or time - my own experience has not pointed to any issue with mfp's numbers for exercise. But then I eyeball my food, so I can't use my results as scientific evidence of anything.
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It means if your exercise adds 200 calories you eat 100 of them. That doesn't seem complicated to me.
I think MFP's numbers are good for some people and not for others. They were fine for me.23 -
I'm no math whiz, but I hardly think figuring out half of 250 calories burned constitutes "on the spot mathematical gymnastics" but ok, whatever works for you.12
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I don't find it all that hard to figure out what half my exercise calories are. As a basic guideline I made for myself, I just try to make sure that my NET is at least 1200 (my before exercise goal is 1480).
I use a Fitbit so that helps me with being more accurate than using cardio machines or gym equipment to figure out my calories.6 -
Huh, I have always been told you shouldn't eat back your exercise calories at all. Shows what I know, lol.4
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But if you've done several bits of exercise during the day and logged them in full, you're going to have to remember how many calories to leave uneaten at the end of the day. So if I burned 100cal walking and 50 gardening and 150 at the gym and 75 cycling to the shops, and I log all that in full but only intend to eat half of them back, I have to be carrying in my head that I have to leave my calories in the green by 183 at the end of the day, and then if I log another 50 calories I have to remember to leave 208 uneaten now, and it just seems very complicated to me.3
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Maybe a package of post-its would help. Or you could write it on your hand. Whatever works for you.1
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Huh, I have always been told you shouldn't eat back your exercise calories at all. Shows what I know, lol.
When it comes to the formula that MFP uses, you are supposed to eat them back (or at least a portion of them). There are other formulas that people use like the TDEE method where people don't add in their exercise calories since they are already added to the calorie goal.1 -
CattOfTheGarage wrote: »But if you've done several bits of exercise during the day and logged them in full, you're going to have to remember how many calories to leave uneaten at the end of the day. So if I burned 100cal walking and 50 gardening and 150 at the gym and 75 cycling to the shops, and I log all that in full but only intend to eat half of them back, I have to be carrying in my head that I have to leave my calories in the green by 183 at the end of the day, and then if I log another 50 calories I have to remember to leave 208 uneaten now, and it just seems very complicated to me.
On your diary at the bottom, your 'daily goal' changes based on exercise you've input (or added automatically from apps.) I make sure my actual intake is halfway between my starting number and the new number.
For example: I'm suppose to eat 1800/day assuming no exercise. MapMyWhatever tells me I've done 400 cals of exercise and can now eat 2200. Instead, I just eat 2000 -- half of the exercise. And it doesn't matter how my exercise is broken up. I could do ten different things, and I'm still only concerned with two numbers. Or one, depending on how you look at it.
tl;dr It doesn't seem that hard to me.
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Huh, I have always been told you shouldn't eat back your exercise calories at all. Shows what I know, lol.
Depends if you are using mfp's calorie allowances, which are low to allow for counting exercise, and then you need to count it to avoid undereating; or if you are using a TDEE estimate from elsewhere which includes all your activity, in which case, no, you shouldn't count them. That's my understanding anyway.1 -
CattOfTheGarage wrote: »But if you've done several bits of exercise during the day and logged them in full, you're going to have to remember how many calories to leave uneaten at the end of the day. So if I burned 100cal walking and 50 gardening and 150 at the gym and 75 cycling to the shops, and I log all that in full but only intend to eat half of them back, I have to be carrying in my head that I have to leave my calories in the green by 183 at the end of the day, and then if I log another 50 calories I have to remember to leave 208 uneaten now, and it just seems very complicated to me.
If you know what your baseline is (let's say 1500), I don't see how it's hard to eat back 1/2 your exercise cals.....
The reason that some log all of their exercisese is that they're tracking time, mileadge, etc... For me, I didn't so I used to enter about 60% of what I do (since I'm not tracking mileage). With my Fitbit now, I do eat back closer to 100%0 -
Huh, I have always been told you shouldn't eat back your exercise calories at all. Shows what I know, lol.
When it comes to the formula that MFP uses, you are supposed to eat them back (or at least a portion of them). There are other formulas that people use like the TDEE method where people don't add in their exercise calories since they are already added to the calorie goal.
Oh, you're right. I guess I'm doing a weird mishmash of the two - tracking with MFP but using the TDEE method of not eating them back. Oh well! You learn something new every day.
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Here is a study out of Ball State. They took 6 of the top fitness trackers and measured them against oxygen consumption (one of the most accurate ways to measure true calories burned). They were all over-estimating calories burned as much as 122%.
http://www.wthr.com/story/31285468/sometimes-your-fitness-tracker-lies-a-lot-fitbit-jawbone-garmin-ifit-misfit-accuracy
As a rule for me, I always log my workouts but it's because I like to see that I get in exercise 5 days a week. You can of course put your workouts in the "notes" section of the diary so that it doesn't enter the calories into your daily calorie total. I make it a rule to try and never eat my exercise calories back. If you do eat them back, I would recommend eating less than half back as this study indicates there is a gross over-estimation. I also set my calories at a sedentary lifestyle. It's taken some getting used to but when I measure my food and eat my daily calorie allowance maybe eating back about 25% of the exercise calories, I do show 1-2 pound weight loss each week. It does work, it just sucks because even with trackers and technology it's very hard to know accurately how many calories YOU burn when you do certain activities and factor that in with eating.
If you set your parameters on MFP, you should know about how many calories you want to consume each day and follow that relatively easy without looking at the overall "Net calories" at the top once you've input your workouts. Use your stats and to find your resting basal metabolic rate. From there you would multiply by 1.2 if mildly active or more if you are very active. That will give you a pretty good estimation of what you need to eat to maintain so eating less than that should help you to see the number on the scale go down.
To answer your final question - aside from the study (which I'm sure has it's own shortcomings but is a good baseline for highlighting the errors with some of these trackers) just from being on MFP and the amount of people who note that they are eating 1200 calories, working out an hour everyday burning upwards of 4500 calories or more per day (highly unlikely) and yet show NO change in their weight it makes me think that they are either under-estimating what they eat, or they go off the tracker and over-estimate how many calories they actually burn during a workout and mistakenly eat too much to allow for any weight loss.
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CattOfTheGarage wrote: »And a related question: what is your basis for thinking mfp overestimates burn (as opposed to users overestimating intensity or length of workout)?
I have a power meter on my bike which measures the amount of mechanical work I do on each ride. It's very easy and accurate (up to about 5% error) to convert kiloJules of work done into kiloCalories of energy required to perform that work. This is a set of pedals that cost $1,300 on sale. When I enter the information MFP wants about a ride I've done, it's usually in the ballpark of 2x too high.
I don't have MFP estimate calories for any exercise I do, so I can't comment on the "mental gymnastics" angle. I have a Garmin watch (Fenix 3 HR) and trust it to do a good job of this, then it feeds the numbers into MFP.0 -
CattOfTheGarage wrote: »But if you've done several bits of exercise during the day and logged them in full, you're going to have to remember how many calories to leave uneaten at the end of the day. So if I burned 100cal walking and 50 gardening and 150 at the gym and 75 cycling to the shops, and I log all that in full but only intend to eat half of them back, I have to be carrying in my head that I have to leave my calories in the green by 183 at the end of the day, and then if I log another 50 calories I have to remember to leave 208 uneaten now, and it just seems very complicated to me.
Two things - 1) I'm not logging every single time I get out of my chair during the day and 2) so when you log it and it says 100 calories -just change it to 50 right there. Nothing to remember later.1 -
Burn 200 calories, log it as 100... Easy enough to double click on the calories and amend them
I fail to see the problem4 -
I always found the MFP estimates to be accurate enough for me for the exercise I typically do: walking and circuit training mostly. When I use a machine like the stationary bike, I often knock it down by about 20% when I log it, and hiking I often just log a shorter time period (usually about 1/3) and go with that estimate, figuring that about covers the amount of time I'm standing still pleading with my kids to just please stop complaining and get moving...5
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WinoGelato wrote: »I always found the MFP estimates to be accurate enough for me for the exercise I typically do: walking and circuit training mostly. When I use a machine like the stationary bike, I often knock it down by about 20% when I log it, and hiking I often just log a shorter time period (usually about 1/3) and go with that estimate, figuring that about covers the amount of time I'm standing still pleading with my kids to just please stop complaining and get moving...
Agreed. I just try to get as good an estimate as I can, and I then eat 100% of my exercise calories.0 -
Well, I would not eat my calories back since I think it defeats the purpose of using exercise as a tool to increase caloric deficit - but who am I to dictate this approach to everyone? I would still advise eating half rather then eating back all of them, just in case that there would be an overestimation... let's not forget that the goal here is to maintain a deficit! This is one reason why I am planning to get a fitness watch ASAP to help me understand my body better
Also... I prefer to enter as my calorie goal my TDEE since that way I see the calories needed to maintain. The calories left (the green number) then represents my deficit, which motivates me a lot more. I think it makes more sense and helps me understand my body better; just make sure your recalculate your TDEE for every 5lbs lost and also be sure to have a sensible tool to calculate your body fat % to ensure best possible accuracy. P.S. I also take my measurements!
All in all, just make sure that whatever you're doing is working and that you're losing on the scale! It's all about making it work for you. We can all share our experiences and motivate each other no matter what. I'm sure there are people that don't eat them back, some people that eat them all back or only half back, and all of those people could still lose weight!2 -
CattOfTheGarage wrote: »But if you've done several bits of exercise during the day and logged them in full, you're going to have to remember how many calories to leave uneaten at the end of the day. So if I burned 100cal walking and 50 gardening and 150 at the gym and 75 cycling to the shops, and I log all that in full but only intend to eat half of them back, I have to be carrying in my head that I have to leave my calories in the green by 183 at the end of the day, and then if I log another 50 calories I have to remember to leave 208 uneaten now, and it just seems very complicated to me.
Am I missing something? My log shows exactly how much I earned. Does yours not? No juggling involved to look at the asterisked 'extra calories earned' amount at the bottom of the page and divide by 2.
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Well, I would not eat my calories back since I think it defeats the purpose of using exercise as a tool to increase caloric deficit - but who am I to dictate this approach to everyone? I would still advise eating half rather then eating back all of them, just in case that there would be an overestimation... let's not forget that the goal here is to maintain a deficit! This is one reason why I am planning to get a fitness watch ASAP to help me understand my body better
Also... I prefer to enter as my calorie goal my TDEE since that way I see the calories needed to maintain. The calories left (the green number) then represents my deficit, which motivates me a lot more. I think it makes more sense and helps me understand my body better; just make sure your recalculate your TDEE for every 5lbs lost and also be sure to have a sensible tool to calculate your body fat % to ensure best possible accuracy. P.S. I also take my measurements!
All in all, just make sure that whatever you're doing is working and that you're losing on the scale! It's all about making it work for you. We can all share our experiences and motivate each other no matter what. I'm sure there are people that don't eat them back, some people that eat them all back or only half back, and all of those people could still lose weight!
If you are using the MFP method, which uses a NEAT estimate, exercise is excluded. Your calorie goal is set at a deficit such that even if you do no exercise at all, you should lose weight. That is why if you do exercise, you should eat back at least a portion of those calories, to avoid having too large of a deficit which can result in loss of lean muscle, as well as other potential adverse effects.
Calculating your goal from your TDEE has exercise calories factored in, so no, you wouldn't necessarily eat back the exercise adjustment. Most people using the TDEE method log the exercise activity and the duration but manually adjust to 1 calorie when it is logged.
You are conflating two different methods - so please don't suggest that eating back exercise calories defeats the purpose.9
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