Friday 9 February 2018

BMI: time for a sub-20 attempt?


Runners and food. How strict is the relationship?

“You run a lot. So you must be able to eat whatever you want!”
“You do marathons. So you must be really careful about what you eat!”
And, somewhere in between those two misconceptions… lies reality.

Firstly, a disclaimer: I’m not a nutritionist. I can’t even cook, which is why the books on the topic I’ve purchased over the past few years don’t feature the dog-ears oft associated with cooking books. Over these past few years, however, I have developed a better understanding of the type of food I should eat ahead of, during and after races. And I mean ‘races’, as opposed to ‘runs’: I can just about pay attention to what I eat around races, but to do so on a daily basis would be unworkable. Not least because I’d often struggle to fathom when I’m ‘recovering’, ‘tapering’ and ‘carbloading’…

. . .

As per the saying that “what gets measured gets done”, I first logged my weight on MyFitnessPal on January 27, 2016: and have done every Monday since. Equally, I log everything I eat on there. Does that mean I’m obsessed?
With stats, perhaps. But not with food. So yes, I do weigh my breakfast cereals as I pour them into my bowl, so that my stats can be accurate; however, given that my bowl typically ends up containing one Shredded Wheat and one Weetabix biscuit, 30g of granola, 20g of Fruit & Fibre and 20g of fruity muesli, I’m hardly holding back… You wouldn’t accuse a Michelin chef of being weight-obsessed for measuring the ingredients in his star-winning mix, so how’s my cereal bowl any different? And that without me admitting to sometimes throwing in a few grams more, or munching a handful of dry cereals before closing the box…

I started using MyFitnessPal to shed a few pounds ahead of my 2016 target marathon, Manchester – although doing so days before traveling to Italy for a Half in the town where I grew up, knowing that weekend I’d be enjoying my Nonna’s homemade cooking, may not have been optimal timing. Then again, nor was the inclement weather that caused the race’s cancellation. Whilst the app will offer you a prediction of your weight four weeks down the line, were you to maintain a similar level of calorie intake and burn, I’ve never paid much credence to that. That’s partly because those guesstimates are utterly unreliable, least in my case: MFP factors the calories that Strava believes I’ve burnt through running, a figure which Strava overestimates (and Garmin underestimates). And, partly, it’s because that’s not where I find value in the tool…
…working from home, I’m constantly tempted by snacking. Whilst the likes of fresh fruit, cereals, cereal bars and rye biscuits are hardly unhealthy options, everything beyond moderation has its drawbacks, just like everything in moderation is fine. Est modus in rebus, folk. That’s why, for me, one of the two major benefits of MFP lies in the knowledge that I’ll have to log anything I eat, as it makes me think twice about grabbing it in the first place and helps those hard-to-find fruity Ryvita packets last a little longer. As for the second benefit…

Let’s briefly step back from nutrition to good old-fashioned running. I enjoy the discussions on Strava, which give my solitary, early morning runs a social coating, as I do enjoy dissecting detailed on Garmin Connect, if not for every single run. I’ve benefitted immensely from fellow runners’ comments, and hope that some of mine have been helpful to others. As races approach, however, I find Strava at its most useful in its simplest form:





That’s right: I enjoy looking at bubbles. Looking for patterns in mileage and pace covered ahead of races, both those that went well and those that didn’t. Just how did I taper for my last marathon? How did it go? What did I do ahead of my best race? How long was my last long run? At what pace?

MyFitnessPal plays a similar role. I could give you a pretty good idea of what I’ll be eating at the start of the week that will culminate with my 2018 ‘A’ race, Barcelona Marathon. Because, cometh Monday, March 5, I’ll look to replicate what I ate on April 3, 2017, six days out from my PB at Rotterdam Marathon. Main meals are likely to vary, because this is a family household and not a pro training camp, although Karen’s very good at accommodating my principles over those final few days. And those principles are quite simple: low carb intake Mon-Wed, carbload Thu-Sat, race Sunday. I’ll be looking to follow it balancing control and flexibility, all the more comfortably so after last April’s Rotterdam jaunt, where the scrumptious breakfast I ate (at Baker & Moore, if you’re heading that way!) with fellow running friends on Marathon eve deviated from the plan but didn’t stand in the way of the desired outcome. So, for ‘plan’, read ‘blueprint’: guidelines that help not undo weeks of good work, but that need not be followed to the letter. Not least because we don’t know what we don’t know. And by that I mean…

Does the fact that last April’s approach helped me to a PB mean it was optimal?

No, of course not. It worked: but that’s not to say there’s no scope for improvement. Should we ever be lucky enough to stumble across the optimal approach, be it across training and nutrition or just one, we still wouldn’t be able to know. Should my last long run have been shorter? Slower? I took my weekly speedwork workout out of my weekly routine in the taper week leading up to Bath HM on March 12, and somehow never got around to reintroducing it: did that have any impact? Would I have been faster had I begun carbloading a day sooner – or maybe a day later?

As with most of my questions, the answer is: “Who knows?”. And that’s where it comes down to one’s degree of risk aversion: how prepared are we to tweak a successful formula in search of an extra 5%, knowing that we won’t find out if it delivered any marginal gains or if it had a detrimental effect until after the event? And, even then, we’ll only be able to go on… er, ‘gut feel’, as we can never attribute a step up or down in performance to any one factor?

I did experiment with carb-depletion ahead of last year’s London Marathon. It was hot on the heels of Rotterdam and I wasn’t gunning for another PB. Not till the days before the race, anyway, when the fact that the calf tear I’d unknowingly dragged around the Netherlands had healed left me wondering whether I could do better. I was amazed by how much weight I lost through carb-depletion, and still had time to carbload ahead of London. It’s a race I don’t remember fondly, but not because I feel nutrition let me down: and I would certainly recommend tweaking proven formulas ahead of races that don’t represent major targets. After all, any time we clock is ultimately the combination of four sets of factors, such as (and this is a limited list):

In The Weeks Beforehand
In The Final 24 hours
Within
our control
      - Training
      - Diet
      - Rest
      - Nutrition
      - Kit Preparation
      - Mentality
Beyond
our control
      - Work (esp. travel)
      - Travel to race city
      - Life
      - Weather
      - Race organisation
      - Fate

Of course, none of the above fit perfectly into those boxes. ‘Rest’ is not always within our control: sometimes sleep eludes us, sometimes noisy neighbours (especially in hotels) will put even the best-laid plans (but not us) to rest. And sticking ‘Mentality’ amongst factors we can control is a gross oversimplification: it fits there for me, though, so I’ll leave it there. Just like I’ll leave ‘Fate’ as a catch-all final category: a four-letter word, it fits more neatly than another four-letter word (‘fits’).

Right: enough waffling. Enough suggesting I have a clue as to what I’m talking about. And back to food…

 . . .

It’s no secret that I began running to lose weight. I managed that within a matter of months (and on a fraction of my current mileage), as there was more than enough to lose. As to why I’ve carried on running, it’s a mystery. Or a combination of enjoyment, camaraderie, achievement, happiness and general enrichment to a life that would otherwise see me stuck inside this house all day long. You decide.

When targeting a race goal, it’s easy enough to work out the required average race pace. Running it less so: but the theory is simple enough. The reality is one of potential divergences between GPS and mile or kilometre markers (with the latter ultimately holding sway) and of sharing the roads with a few thousand people: hence, while my watch may think I ran 26.7mi in Rotterdam (see bubble above), if you look in the book it says 26.2 – and that’s all that matters. So, come March 11, I know that having my watch tell me I’ve run 26.2 miles at an average pace of 6’40”/mi may not mean I’ve achieved my 2:54’59” goal, whatever the calculators may say: so, if we assume that GPS mismatches and having to deviate from the shortest route to overtake mean my watch will measure the Barcelona course the way it did the Rotterdam one, I need to be running at 6’33”/mi – or 4’04”/km, if you prefer. As if 6’40”s (4’09”/km) didn’t feel disarmingly daunting enough… but at least I can figure out the figures, if not necessarily run the run.

What’s harder to figure out, and impossible to be certain about, is all the fluffy stuff around it. It’s all well and good me listing ‘training’, ‘diet’ and ‘rest’ as items within my control, with ‘training’ and ‘rest’ combining to give us a fourth key item over the final two weeks: ‘tapering’. But the fact that I can control, or at least “heavily influence”, them doesn’t mean I know for what I should be aiming…
…and that is particular true about one statistic which reflects the combination of those factors: race weight.

There is a very simple number that routinely gets banded about when discussing race weight: 127. That’s the number of seconds that, all other things being equal, you can supposedly shave off your marathon time by losing a kilo. In this equation, if form, course and conditions are constants, for every thousand fewer grams you cart around for 26.2 miles you can cross that finish line 2’07” earlier. Such logic is indisputable. Or is it?

In principle, yes. It’s reflected in the millions poured by F1 teams into making their cars as light as possible. But you won’t find them compromising on engine power. That remains paramount. So where do we draw the line? At what point does less weight equate to a weaker engine?

Another open question. Another “it depends” answer. Although we do have some clues…

When it comes to elite marathon runners, they have significantly lower BMIs than leading athletes in other fields. London 2012 Olympic gold medallist Stephen Kiprotitch comes in at 18.2, for example. At the opposite end of the scale you’ll find another London 2012 gold medal-winning runner. But sprinting is a different game, for which Bolt needed his BMI of 24.9. Of which I doubt even an ounce was fat, whereas muscular runners leading a major marathon are a rare sight. Just like you’re unlikely to see a man above 1.82m (my height, as it happens) at the front of the pack. Just as well the 1.95-tall Bolt took to sprinting, then, where those looong legs proved an unbeatable asset. As for me, I can’t shrink… but should I be looking to bring my weight down?

Well, it would be nice – but…

Given that on 22/11/2011 (the day of my epilepsy op) my BMI was 30.0, and that two years later it was 22.5, I think we can safely say that the law of diminishing returns has long kicked in on that front for me. Still, let’s do some maths anyway. Feed the average of my last six Monday weigh-ins (68.4kg) into the NHS calculator, and it spews out a BMI of 20.6. To hit 20, which represents the lower end of the ‘normal’ range and is an accepted rule of thumb for a good marathon racing BMI, I’d have to get down to 66.25kg…
…is that realistic? Is it worth it?

You’ll have fathomed by now that, as with most things running-related, I don’t have an answer. So, as with most things running-related (not least sub-20 attempts, be they over 5k or 100 miles), I’m going to file it in the “worth a go” category. Not for long: when I finish my next long run on Sunday, Barcelona will be four weeks away. This means both that I won’t have to cut corners for long and that I haven’t got long to cut corners: two more long’uns, then Bath Half on March 4, a race which usually works perfectly as an indicator of my marathon shape but which this year is too close to my target race to be anything but the most expensive training / tune-up run I’ll have ever run, then it’ll be race week. Besides: which corners can I cut?

I’m not going to overhaul my diet, that’s for sure. It’s a good, balanced diet; I already steer clear of most of the food you’d expect someone training for a 2:55’ marathon to have cut out; and I certainly won’t be foregoing my share of the panettone that we bought for Christmas but have yet to open, due to a plethora of yuletide alternatives followed by Karen’s birthday cake taking precedence. What I can do, however, is reinstate the habit that was the foundation of my weight loss when I first started running almost six years ago, and turn on one that I normally only reserve for taper-time…
…because, of all the things that helped me shed 25kg in around five months, only running helped more than me resisting the urge to finish off any food my kids left on their plates. It’s a habit I’ve knowingly got back into, because I can – although, to be fair, they don’t leave much these days! Now to see if I can just as knowingly get back out of it again, because I want to; and, at the same time, to reduce snacking in between meals. Which means stop putting my hand in the cereal boxes, and not eating the sandwich crusts that make it home in Roberto’s school lunchbox. There’ll still be scope for proper snacks, be they fruit, ClifBars (of which there is never a shortage here) or the like: but, on the whole, getting back into that habit of drinking more water and munching less shouldn’t do any harm. I’ve made a start: and, if history is anything to go by, resisting temptation will get easier. That’s because unnecessary snacks only fuel more hunger rather than the body: a problem that’s all the more acute in the UK, the only country in Europe where processed foods (of which many are sugary) account for over 50% of the food we buy. But main meals will be pretty much unaffected. After all, a man’s gotta eat. Because a man’s gotta run. And that’s not something I’ll be forgetting. So I might stop clearing up my kids’ plates – but that doesn’t mean I’ll stop helping myself to seconds in any great hurry…

Indeed, the role of food and how amateur athletes look at it was a core topic covered by four-time Ironman World Champion Chrissie Wellington at a talk she gave in Bristol a few months back and which I was fortunate enough to attend. Some points that stuck (and I paraphrase):

  • Food should be viewed as ‘fuel’, not ‘reward’ – so don’t deny yourself
  • During training, teach your body to adapt to a race scenario. You can’t go on a long bike ride devouring cake and then expect your body to get by on gels on race day

Since I go out before breakfast, my body generally does a decent job of running on fat and preserving carbs: something which works well on some training runs, but won’t be my strategy for Barcelona. As for viewing food as reward, I think it can be all the more enjoyable if associated with a successful workout or race: but the principle that it is first and foremost fuel is sacrosanct. So yes, there is a chocolate bar in the rucksack I use for parkruns (of which I’ve not run one since early December – eek!) which I’ll only eat when I break eighteen minutes: but there’ll be Clif Bars aplenty beforehand!

It’s worth noting that Chrissie has long openly spoken about her own struggles with eating disorders, and points visitors to her blog in the direction of a 2014 article from triathlon magazine “220” on the topic which has sadly lost none of its relevance. Indeed, only a few months ago Scottish record-holding high-jumper (turned non-elite marathon runner) Jayne Nisbet spoke about her battle against bulimia, which fortunately she won. In this regard, elite athletes, and those a rung below trying to make it to the top, probably face greater risks than recreational ones, as they seek that extra 0.1%; and they may sometimes find themselves being pushed in the wrong direction by reckless, irresponsible coaches, or misguided parents. Zoom in on female athletes, and the issue takes on an additional level of complexity and risk. 

So: if I shed a couple of pounds, great; if I don’t, no worries. The majority of the indicators on my form dashboard are pointing in the right direction, and even if I were to gain a couple of pounds ahead of Barcelona I’d be approaching the race start line lighter than I ever have. Of course, I reserve the right to worry nearer March 11: but that’s because I know no cure for maranoia. I just know that, however I’m running, however I’m feeling, it’ll kick in. Least after last April I know that being around friends in the build-up to a race will help keep it under control when it could be at its peak, something I plan to remember in particular when I sit down for breakfast with friends in Barcelona on Saturday, March 10.


Talking about sitting down to eat with friends… in a few hours’ time I’ll be meeting up with some I’ve not seen in a year or more for a succulent curry. Oh yes. Bring it on! And I’ve already logged what I plan to eat, so I shouldn’t get carried away…
…oh: and this post was very much centred around my goals and my habits. So I didn’t find time to go off on one about fad foods and the over-emphasis placed on carbloading, both of which running mags needing to attract advertising may occasionally promote as more beneficial to running than training itself, whereas they are only beneficial once the hard graft’s been put in… or about how carbloading only helps if you’re running for at least two hours, meaning that carbloading for a Half Marathon can actually prove detrimental… But I might do another time.