5:2 with running

This topic contains 18 replies, has 11 voices, and was last updated by  Sarcina1991 5 months, 3 weeks ago.

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  • I have been run/walking for about 2 years and have done 5 half marathons. I love it and do not want to give it up. Is it possible to do IF and keep running? I am not training for anything now, so it seemed like a good time to try. I did my second fast day yesterday and also ran 2 miles. Felt tired, but not terrible. I need to lose about 20lbs and really want to give this a try. I’m hoping there are others like me. Any advice is appreciated.

    Short answer is yes. With practice you should be able to get up to about 85% or so of your FPT. I don’t run but cycle. You wont set any PB but there is no reason you cant fast and run, just sit on about 80-85% of the pace you would normally sit on. Lots of top athletes now train in a ketogenic state.

    Take it easy to start with, it will take at least a month before your liver starts to become well adapted to processing stored fats. Been doing it for about 9 months now and the last month Ive noticed its a lot easier.

    That is great to hear. I plan on only doing longer runs on Saturdays when I won’t be fasting the day of, day before or day after. Can’t avoid it on other days. I will experiment with running days and see what works best. Glad to hear it gets easier.

    I am fasting and running too and actually now I pick for running only fasting days. If your stomach is empty and body is not processing any food, it has more energy for moving activity. It’s much better.

    I have no problem combining running with fasting. I don’t run long on my fasting days (max about 16km) and use these days as practise for non-carb energy burning. I save my long runs (20+km) for days that I am not fasting.

    I have been running marathons (and one ultra) for years and cannot feel any negative difference in my marathon training since starting fasting.

    The important thing is to make sure you are well hydrated on your fasting days.

    Thank you for your replies! It’s been about 3 weeks now and it is getting a little easier. I’ve found that I can run the morning of a FD, but evening is very difficult. The morning after a FD is also very difficult. I will avoid these if I’m training with friends, because I don’t want to hold them back, but on my own I don’t mind a hard run sometimes. Generally I’m planning my runs around FDs. It’s working so far.

    Great to hear others doing it too! Anyone training for anything specific? I’ll be starting training next week for the Savannah Half Marathon in Savannah, GA, USA.

    I’m just starting trying the 16:8 today – I’ve done the 5:2 for a couple of weeks but it feels hard to fit into my sked with my kids or socially. Skipping breakfast & abstaining until lunch feels more manageable so far and allows me to feel “normal” with my sked. Guess I’ll see how it works when/if I lose any weight! I did do a workout this morning so can really feel my hunger and insulin dropping & will try running tomorrow…will be interesting to see how that translates as well. Wish me luck! 🙂

    Good luck, paleofast! I can tell you that it definitely gets easier with time. I have been doing 5:2 and training for my half for about 10 weeks. I don’t really notice much difference now when I run on fast days. I am still avoiding fasting near my long runs. I have lost 11 lbs and that alone makes running easier! I have noticed the loss has slowed down some the last couple of weeks. My miles are getting higher and I think I am eating more on NFD. Which is fine with me. I don’t mind losing slowly as long as I’m feeling well and running well.

    Anyone else running and fasting? Want to compare notes and keep each other motivated?

    Let us know how 16:8 goes. Without intending it my routine has already evolved into 14:10, so it wouldn’t take much of a stretch to move to 16:8

    Thx! It feels more “manageable” to feel the hunger but know that I can eat in a few hours – I suppose if I stop eating earlier at night then my 14 hours comes up faster, but what I’d rather do is stretch it to noon or 1pm regardless to try to gain the most benefits. I’m definitely hungrier than normal since I worked out, but that kind of feels good (in a sick way) too! It’s only Day 1 of this regime, but I’m already liking it more than 5:2…we’ll see!

    BTW, coffee with sweetener & no cream is just vile…;-)

    Ah, misunderstood. I assumed you were doing 16:8 on your none fasting days. I think I’ll try both – I have always found it easy to skip breakfast and I normally eat very early evening. I have just completed two consecutive fasting days so we’ll see how the gym goes tomorrow morning without breakfast.

    Ah gotcha – didn’t even think about combining 16:8 with 5:2…I’ll see how a week (5 days) of 16:8 alone goes then possibly try to combine it with 5:2. The appeal of the 16 for me was how it fits better into my schedule rather than trying to plan my social life (or kid time) around when I can and can’t eat/go out, etc. These forums are super helpful – keep the support coming! 🙂

    Hello all.

    I’m new to 5:2 and also new to running. Looks like I’ve found the right forum! Just curious, do you have any ‘program’ recommendations for a beginner? I’ve done the Couch to Five K program before, but wanted to explore other options.

    Also, is anyone weight training along with the running? I used to be an avid lifter but don’t want to do TOO much all at the same time.

    Thank you!

    Welcome moecho. I hit the weights at least once a week, combined with the rowing machine. Running was my main activity, 6 days a week, total 40 miles, but my back and knees are not as keen as they were so I mix it up and try for a variety of activities.

    Thanks Penguin! Appreciate the feedback.

    so glad to found this thread.. the read was interesting. i am 3 weeks into 5:2 i am trialling it on my down running time. after reading your comment SP13 feeling better about doing marathon/ultra training on the 5:2.. you must of found the balance between the 2. as i have run on an empty stomach and really struggled to get the distance, and with summer coming distance runs are a struggle in the heat anyway. sunday is my big run day so i should be ok as monday & thursday or FD
    happy running 🙂

    Hello! I am starting week 3 of IF. I didn’t run on fasting days my first week, and last week ran on each of my fasting days, and also on non-fasting days.
    I’m finding that my endurance is fine at a moderate pace, and even better than it was for runs in the 4-5 mile range, but in general, I don’t feel like I have my same power when doing interval training or sprints, either on fasting or non-fasting days. Does it just take that much time for my body to adapt?
    And this may be related or off-topic here, but I see reference to training in a ketogenic state here and in the book. Does it matter if I go into a ketogenic state for even a short period of time, ie, are there any longer lasting effects from training in a ketogenic state? Can I truly be in a ketogenic state if I exercise on the morning I begin my fast? I do typically go through a hunger stage during my run during the first mile on FD, but it subsides.

    Hi J-ray. I’ve also been doing this for about 3 weeks and have been running on my fast days. I used to run in the morning for about 35 minutes but I get really hungry afterwards and that makes the FD much harder. Now I run and cycle in the evening before I have the luxury of a small evening dinner. I have a theory that if I run in a fasting state, then I’m using fat as a fuel, at least in part. The next part of my theory is that endurance training is easier because my body is used to using fat as fuel after glycogen and blood glucose have been used up.
    I can’t run as quickly on a FD and I’m not sure I’d want to try anything like interval or hill work. But having an easy running day while fasting doesn’t seem to present any problems to me now.

    I used to run six days a week but with advancing age (now 72) , a damaged spine and dodgy knees I stopped and for the last couple of years I have worked out in the gym. Since starting 5:2 I have lost a lot of weight. I was a heavy runner. Out of curiosity during my last gym session I tried the treadmill. Back and knees were fine with it but after half a mile I had to stop – no stamina. That surprised me, I regularly walk 6 miles. I may be thinner and the muscle strength is fine but clearly when it comes to running I have to start from scratch and build it up again.

    Hey runners!

    Doing half marathons on 5:2 fasting definitely is possible, you just need to listen to your body a bit more.

    I started with IF in beginning of April this year and ran two half marathons and one 10km race since I have started. All in all, I did not see any negative effects, in fact, I decreased my half marathon time from 1:41:17 just before starting IF to 1:40:03 about one month after starting to 1:38:55 (finally! 😀 ) two weeks ago. Also my 10km time improved from 45:20 last year to 44:30 this year in May.

    My intention is not weight loss, so I am not so strict with myself on fast days. I usually keep exercise to a minimum on fast days, but if I happen to run on fast days, I eat a banana before and a small meal afterwards, roughly balancing the calories I ran off (usually a plate of fruits with 300 – 400 kcal).

    For me, easy runs up to 15 km work fine on fast days. I do not do intervall trainings or long jogs on fast days.

    I think you have to be careful to get enough overall calories when extensively training for a half marathon in order to not risk injuries from incomplete recovery.

    Good luck!

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