Fiona O'Donnell MSc Nutritionist

Fiona O'Donnell MSc Nutritionist

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Empowering change for a healthier, fitter you. Nutritionist and lifestyle coach. Founder of #SUSTAIN Feedback is more than welcome and is very much appreciated.

I built this page initially to chronicle my journey from marathon running to competing in figure competition. I love training and I also love eating - so dieting is a big challenge for me. For this reason, I try to develop new recipes which are gluten free, sugar free, low carb (for the most part) and highly nutritious. I am open to learning as much as I can whilst on this journey. Following compl

Photos from Fiona O'Donnell MSc Nutritionist's post 21/08/2026

If you’re wondering why Pippy is my model for today, here it is;

Pippy has very specific behaviours with food. She doesn’t rush to it, she can hoard an apple for days just because…

She doesn’t bite your fingers when you’re paying the cheese tax. There’s no urgency.

Her cousin, Danny, on the other hand, is a savage. He would take your arm to the elbow…. After you’ve told him to be gentle.

Now before you think I’m comparing people to dogs… take a breath.

I’m comparing a state. Relaxation around food, enjoyment, appreciation….

Versus, urgency, a sense of lack, constantly looking for and thinking about the next meal.

We help clients to understand where the urgency comes from…. Whether it’s a physical prompt like hunger because you’ve been “so good all day”….

Or is it about how you think.

When it’s happening, all we see is the craving, the need to eat…. We don’t take the extra few steps of pulling on the threads of that thinking and understanding it.

In a world where ‘6 week bodies’ are the trend and as thin as possible appears to be à la mode, we want to work with women who know that 12 weeks is just the beginning.

12 weeks is just laying the foundation for change. Real change takes time, support and a willingness for growth.

If you’re ready for that change, we are opening our group coaching again for September.

12 weeks of 1-1 sessions, group education, introduction to movement and psychoeducation, all enclosed in a single package.

Are you ready to really pay attention to what your body is telling you?

DM me with JOIN and let’s chat.

Photos from Fiona O'Donnell MSc Nutritionist's post 28/07/2026

Making a quick comeback to advertise our trusty camper. Completely renovated horse box in 2021. Replaced walls and floors, full electrics with leisure battery. Touch lighting with phone charge ports. Completely insulated with laminate floor and kick boards. L shaped couch with under seat storage, folds out to large double bed. €15,000.

Photos from Fiona O'Donnell MSc Nutritionist's post 28/07/2026

Selling our awesome horse box / camper.
€15,000.

Full electrics inside with leisure battery. Phone charging ports and lights.
Fully insulated. Floors and walls replaced in 2021. Original fibre glass roof. Camping window at the back with privacy screen. L shaped couch opens to double bed with under couch storage compartments.
Jockey door for access and front ramp with new flooring/rubber matting. In excellent condition - indoor storage year round when not in use.

08/07/2026

My first exposure to ‘nutrition’ was in my PT programme in 2002 (yup….. 24 yrs ago)

It contained the basics.
Food pyramid, macros, energy balance…..
The importance of fuelling your workout.

The conversation was centred around ‘eat this way to stay thin’.
So that was my perspective on nutrition from that programme.

Eating and exercise was for ‘thinness’.

As I explored more, I discovered precision nutrition and my eyes were opened to the behavioural side of food.

I began to understand how environment, sleep, stress and genetics influence food behaviours.

It moved me away from the ‘blame’ model towards a model of empathy and collaboration…. But it still felt like it wasn’t enough.

Having acquired my undergrad in Medical Physics and Physiological Measurement in Dublin, I had a solid understanding of physiology and biology…. So I progressed towards a Masters in Exercise and Nutrition Science.

I wanted to understand the bigger picture…. How does how we use our bodies link with how we nourish our bodies?

It was a great programme - we spent days in a lab doing testing, more physiological measurements, history taking…. It was a huge challenge…
For my thesis, I explored whether a simple phone intervention influenced blood pressure reduction within a walking group compared to a control.
Unfortunately, the weather turned, attrition rate was too high to make any meaningful assertions as to the effectiveness of the intervention.

I still felt it wasn’t enough.
I wanted practical experience…. So I started bodybuilding.

Competed twice….
Developed orthorexia….
Packaged restriction as success….
Binged entire roast chickens and loaves of bread….

It was grim.

Started (during that phase) an evidence based post graduate diploma with the IOPN (which at the time was SENr accredited. It no longer is so wouldn’t recommend as you’ll have to do a shed load of work for portfolio).

That programme literally took me on a journey of biochemistry, deep dives on human physiology, reams of white papers and buckets of research.

It took the consensus research papers and translated them to practice.

Game changer.
More in

05/07/2026

Seeking and savouring moments that bring me joy….

Something that stood out to me during the was the importance of savouring the little pebbles of joy that we collect throughout the day.

Observing or recording these moments provide us with a ‘bank’ of happy memories or pebbles that collect to contribute to positive affect.

A type of gratitude practice if you like.

What moments have you collected this weekend?

Photos from Fiona O'Donnell MSc Nutritionist's post 04/07/2026

I was asked recently why I don’t have ‘weight management’ in my LinkedIn Bio.

And the person who asked me, went on to tell me that I’d probably get far more exposure and gain more clients if I added it.

I explained that it would be like a shop that sold fresh fruit posting a billboard outside their door selling ice cream…. When they don’t stock ice cream…. But they want to use it as a ploy to get people in the door.

🤢 I don’t want to use manipulation or trickery to ‘get more clients’.

Maybe it’s a poor business model…. But I’m not here for it.

I’ll stick with explaining what we do….

Sharing case studies where it’s appropriate so that you can get a clear idea of how we help our clients to achieve their results…

And if that means that I achieve a smaller, more authentic following or client cohort, then I’m here for it 100%.

I remember one time, I sold access to a beta programme that I was trialling.
I contained some psychoeducation to see how delivery impacted those involved - did it help? Was it useful?
I emphasised the need for individual sessions in order to discuss individual changes if that’s what the members wanted.

2/3 of the clients who joined, stayed working with me for 9pm the to 2 years.

The other 1/3 left - maybe they got what they needed, maybe it wasn’t for them, maybe they already know this stuff.

One person complained. The programme wasn’t what she wanted and she was incredibly disappointed.

And that’s not what I want for my clients.
So I put more detailed contracts in place - so that each of my clients understands exactly what our relationship looks like and how we go about co-creating that relationship.

Transparency always.

Without paying thousands up front with no possibility of a refund.

Terrible business model - but one that aligns with my ethics.

So no - I’m not the person to help you focus on weight. But you will be changed after you’ve worked with me.

That much I can promise.

Photos from Fiona O'Donnell MSc Nutritionist's post 01/07/2026

Whatever I choose works for me.

I’m grateful to have the financial means to be able to buy a selection of my favourite foods made by small producers.

I’m happy to pay a little more for some things, especially when I enjoy them.

I buy them because they taste good and because I enjoy supporting local Irish businesses.

Some people don’t have the financial means to make those choices.

Some people work huge hours and don’t have the time or energy to cook meals from scratch.

Some parents are so exhausted because of sleepless nights that a frozen meal is their lifeline.

Now imagine going out of your way, to point out to these people, that their choices are way down on the list of ‘should buy’ items.

Imagine implying that these people are actively choosing to support another countries unethical production methods 🙄 of their irish counterparts (and making up stories about standards to suit their narrative).

Imagine setting a list of notional rules about food like ‘you can’t have sugar’ ‘sugar is killing our gut micro biome’ ‘you can’t eat after 6pm’ and ‘smoothies make you fat’ ….

Imagine implying that if you don’t wake at 5am to journal and finish your day with a meditation that you’re ’just not trying hard enough’.

Imagine a 20 yr old newly qualified gym bunny (boy or girl) telling a new parent that we all have the same 24 hrs in a day.

Now just have a think about how ridiculous that all sounds.

If you want to perform at a certain level …. If you want extraordinary results…. The effort that goes into that has to be exceptional.

But most of us are just trying to stay a little bit fit, a little bit healthier …. And live a life of balance and contentment.

Can we start to dodge the advice that absolutely nobody asked for (I recognise the irony here btw)

But I guess the difference is, I’m working in this space and have been asked for this advice a gazillion times.

Thoughts?

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