Tom Hollis Health

Tom Hollis Health Sports nutrition & running coaching
Registered Dietitian & UK Athletics Coach
MSc, SENR Practitioner

'As a Registered Dietitian with years of experience and a love of distance running, I offer tailored nutrition advice and structured diet plans specifically periodised to your schedule, to optimise your training, race day, and recovery. Consultations can take place face to face (London) or virtually, and consist of one-off appointments or ongoing sessions as part of your race day build up. My prim

ary interest is delivering vegetarian and plant-based advice, but all dietary preferences are welcome.'

You win some, you defer some. Incredibly grateful to  for the elite entry spot this year, but despite my recovery from L...
09/05/2026

You win some, you defer some.

Incredibly grateful to for the elite entry spot this year, but despite my recovery from London going ok so far, it would be highly irresponsible to run a marathon tomorrow, regardless of pace (at least until I have a clearer diagnosis of what caused the GI bleeding in London). Health has to come first.

So, I've deferred until next year, but made use of my flights to come and support my friend and soak up the frankly terrible views round here.

My dramatic and unforgettable London Marathon 😳.  What have I learned?It's hard to believe it's little over a week since...
05/05/2026

My dramatic and unforgettable London Marathon 😳. What have I learned?

It's hard to believe it's little over a week since I was rushed to A&E after the finish line. It's been a wild time, and while I still await a clear diagnosis on what caused my severe GI bleeding, here are a few early reflections:

After 15 years of endurance running and 19 marathons, I thought I knew my body pretty well, but the complex interaction of health status, life stress, fitness and training load is always evolving and often on a tightrope. Regardless of what led to my bleeding last week, this has led me to rest, reset, and reassess my own balance in the same way I do for my clients.

My first experience of accidentally going viral, and with it, the toxic / trolling side of social media. I have thick enough skin to dismiss this, but it shone a light on the negativity of certain demographics and platforms.

When to listen to your body and when to ignore? This is a key question. Anyone who has pushed themselves over the marathon knows it is a unique and ongoing battle against any number of physical and mental discomforts, so it shows a complete lack of understanding to suggest that discomfort means you should stop. In this case, with the benefit of hindsight, clearly I wish I had stopped for the loo, then seen blood, then stopped altogether. However, there's every chance I would have assumed beetroot juice (as I did when it first happened) and carried on, so who knows.

In my post before the race I said I was 'determined to enjoy' my last London Marathon as a Londoner. Well, it's fair to say that didn't happen, but I'll certainly never forget it. And although I feel completely detached from the results of the day, it's special to have been on the course while human history was made.

Finally, I bloody love the NHS. Imperfect, yes, but full of talented and kind people. In all my ICU years, we'd usually see 2-3 marathon admissions on the Monday, but this was the first time I'd seen the much steadier flow of marathon A&E admissions. I'm so grateful to those that helped me through such a scary time last Sunday ❤️‍🩹.


London Marathon horror story continued.....better not delay this, given various toxic messages and assumptions over on F...
01/05/2026

London Marathon horror story continued...
..better not delay this, given various toxic messages and assumptions over on Facebook where these posts automatically get copied to. Wow 😳.

So at the finish line, a few familiar faces tried to chat as I staggered around, and I overheard chat of world records and sub 2, but it was all a blur and I couldn't engage.

Then I went into some toilets...huge amounts of bright red liquid 💩. At first I thought this was the classic beetroot juice effect 🤦‍♂️...then it happened again, but more. Then I bumped into , who in no uncertain terms told me I looked horrendous and to get to the medical tent.

The next 90 mins were spent with St John's Ambulance, where the kind staff became increasingly concerned as I kept passing blood (5 times), and shivering uncontrollably with a tender abdomen. They called for an ambulance to A&E, fearing ischaemic gut.

Getting an ambulance to the Mall on marathon day was an issue in itself, but the paramedics were incredible and blue-lighted me through the busy streets.

At the entrance to A&E I went from freezing cold to pouring with sweat and very nearly passed out. That lasted about 5 mins and was the scariest part of all.

Then after a few hours, things started to stabilise. Bloods (lactate and CK) were nowhere near elevated enough for ischaemia or rhabdo respectively, and abdo pain eased slightly. PR exam was reassuring. BP was REALLY low (they used 2 different machines as they assumed it was faulty), but was able to tolerate water rather than IV, and eventually it was felt that I was no longer an emergency situation and would be better off spending the night at home, with a low threshold to come back.

I was delighted to get home late that night, and the shower was as good as any post festival one (I was disgusting), but it was a wild night, with loads more bleeding and abdo cramping throughout.

The working diagnosis is acute colitis, which I am willing to accept, but what I need to know as I now slowly recover is, after 19 marathons, why now, what was underlying to cause this, and have I done any lasting damage? I now await colonoscopy and some answers🙏.

My London Marathon horror story: 💪 to 🚑Last Sunday was my scariest and worst day in 15 years of running. Here's a potted...
30/04/2026

My London Marathon horror story: 💪 to 🚑

Last Sunday was my scariest and worst day in 15 years of running. Here's a potted history of how it unfolded. There's too much to say in one post, so here's the first (and most straightforward) part.

I ran a steady and sensible first half, 76:11. However, just before this, around 20km, I felt a sudden urge to stop for a loo. I would have considered this a professional failing in fuelling, so instead slowed down and waited for it to pass.

I kept slowing down, and although the urgency passed, the gut discomfort meant I didn't risk taking on even a sip of water or gel for the remaining 22km...absolutely unheard of for me.

I tried to pretend to myself I was 'cruising home' and 'enjoying the crowds' (see photo 🙄), but the truth is I was deeply uncomfortable and could not wait for the finish line to come. It finally did, and 2:35 was my slowest London Marathon time in a fair few years, but none of that is relevant right now!

Fast forward 4 days and I'm very much still recovering mentally and physically, and I'll try to post again tomorrow to help fill in the gaps between that finish line and this sofa.

📷 Now a 4 year London Marathon photo tradition......and I will forever regret taking the 2024 one in the garden and not ...
24/04/2026

📷 Now a 4 year London Marathon photo tradition....
..and I will forever regret taking the 2024 one in the garden and not on the sofa.

So, it's London #8, and overall marathon #19 for me. It's looking like another warm year, so I'm going to be conservative and disciplined (he says), and enjoy what will be a final victory lap to my 19 years as a Londoner.

I have to be realistic and say these probably aren't PB conditions for me, when the margins are already so fine, so I'm determined to actually enjoy it. No headphones, just soak it all up. Probably cry.

Although we might be leaving soon for a much needed change of lifestyle, I'll always love this city, and it's genuinely at its best on marathon day. What a privilege it is to be healthy and fit enough to be running one of the greatest races on earth (nothing like a day on ICU to give you perspective).

I'll try to never take it for granted. Good luck everyone, and don't forget all the freebies (best bit).

Big news 🏥. Last week I called time (at least for now) on 13 years as an acute clinical dietitian. Emotional, stressful,...
09/04/2026

Big news 🏥.

Last week I called time (at least for now) on 13 years as an acute clinical dietitian.

Emotional, stressful, fulfilling, overwhelming, enriching, depleting. It has been all of these things, often all in the same week.

I don't regret it, I will never forget it, and I'm proud of everything I've given, particularly the last 8 years on ICU and those unforgettable, seemingly endless years on the COVID front line (depicted here by the horrendous FFP3-ready tache that I rocked for WAY too long, and the classic face mask MDT handover scene).

But the time has come to take the plunge! I'm going full time with my running nutrition and coaching consultancy, which has been growing steadily alongside my clinical work since 2019.

Still a couple of months until this change kicks in, but I'm very excited (and a tiny bit nervous). I want to thank my amazing, loyal clients for making this possible, and a shout out to my healthcare colleagues for the inspiration and (usually) gallows humour over the years ♥️.

Málaga Half...tough day 👎Wasn't at all sure where today would land, but it didn't go well, and am in a bit of a tough pa...
15/03/2026

Málaga Half...tough day 👎

Wasn't at all sure where today would land, but it didn't go well, and am in a bit of a tough patch trying to work out where my fitness Vs fatigue is currently.

Felt tremendous until about halfway, but then I think the short turnaround post marathon caught up with me and I allowed myself to back off...massively. 73 something in the end, which is a blow to the ego for sure, but it's all a journey isn't it and important to share the tough days and not just the PBs.

The timing of this one was never ideal on paper but was chosen for family holiday reasons, and with that in mind, I'd better dust myself down quickly and draw a line under it. At least the sun is shining! ⛱️


When Strava comments hit the spot 🥹Seville Marathon took it out of me in a BIG way. I got pretty sick the week after, so...
01/03/2026

When Strava comments hit the spot 🥹

Seville Marathon took it out of me in a BIG way. I got pretty sick the week after, so I suspect this was why it felt such a grind on the day, but even so it is a tough one to take when hopes were so high.

There's no shame in 2:31 if that's my floor being raised, but the race experience was just so 💩 as my body wasn't playing ball. I'm so glad I eased off in the final 20 mins, otherwise recovery would have been even harder than it has been.

So I just wanted to give a quick shout out to people like these two who take the time to write a thoughtful comment on Strava (especially since I don't even know one of them). In that post marathon emotional rollercoaster, these two really hit home. Thank you 🙏.


Seville 2026...some days you win, some days you learn. Not the race I wanted. 2:31:29 was the result, which I know is no...
16/02/2026

Seville 2026...some days you win, some days you learn.

Not the race I wanted. 2:31:29 was the result, which I know is nothing to be ashamed of, but far more frustrating is the fact I felt rubbish throughout and couldn't enjoy the race.

I'm the fittest I've ever been and conditions were perfect, but my body just wasn't right. On good days (like Abingdon), it all flows and the kms tick by. Yesterday was the opposite. I kept waiting for it to feel smooth and it never did. I stayed disciplined (HR) and hung in there until about 35km, then called it a day effort wise and jogged it in to minimise the damage when I knew my goals for the day were all gone.

I have my theories as to why my legs and body felt so off yesterday, but I don't want to sound like I'm reeling off excuses. Ultimately it just wasn't my day.

So while it feels like a wasted opportunity for a huge PB, I have to focus on the positives (didn't quit despite being desperate to, still never DNFd a race) and more importantly, learn from it and use it to fuel my 🔥 for better race days.

Marathons are hard, especially when the difference between a good and bad day is only 2-3 sec /km, and there are so many factors that need to fall into place.

I've rambled 😂, but hopefully useful to share my honest reflections on a tough day. I'll dust myself down and go again.

P.s. It was at least an excellent weekend of meeting loads of happy runners from various running communities, not least my best man John (pictured), who smashed his PB by 8 minutes to 2:43, and we celebrated appropriately 🍻.

Unfinished business 🇪🇸This time last year, injury robbed me of the chance to race  , but as I jogged round the course, I...
14/02/2026

Unfinished business 🇪🇸

This time last year, injury robbed me of the chance to race , but as I jogged round the course, I took everything in and promised myself I'd be back next year to attack it.

Well, here I am. This was going to be my big sub 2:30 hope, but having got to that milestone unexpectedly early at in October, the goal for tomorrow is looser.

It's been a top block, and conditions look incredible, so it's a case of execute well and see where that lands me 🙏. Vamos.

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