Bienvenido a Bite Size Pieces Nutrition

¡Hola! Soy Gillian. Tengo más de 8 años de experiencia en el asesoramiento nutricional de gente de perfil muy diverso, desde clientes que quieren mejorar su alimentación hasta deportistas deseando optimizar su rendimiento.
Monday - Friday 09:00 - 20:00
Saturday - Sunday Cerrado
Algunas fotos de mí:

De Lunes a Viernes de 9.00h a 20.00h


About Me

Bite Size / About Me
Years of experience

Nutrition Counseling

Nutrition Certifications

In schools in Spain and USA

Satisfied customers

And healthier

Improve your quality of life

I haven’t always liked eating healthy and exercising! Until I was almost 21 years old I hated vegetables, loved sugar and drank soda! With a combination of changes to my diet and a bit of exercise, I was able to lose almost 10 kilos- and never gain it back! If you want to improve how you see yourself in the mirror, learn how to eat in alignment with your goals AND like your diet… let me help you achieve those goals!

The keys to reach your goals are:

Nutrition 0
Exercise 0
Rest 0

How can I help you?

The training in Anthropology opened the doors for me and made me grow interested in knowing more about the functioning of the human body. I have completed my training in nutrition through courses and certificates in schools and private organizations in the U.S., Canada and Spain.

Academia ANEF - Formación Técnicos de Fitness

Sport Nutrition

2016 – 2017

ANEF BCN – Fitness Professionals Academy


L1 Certified Coach


Precision Nutrition – Nutrition Academy


Holistic Nutrition


Institute for Integrative Nutrition


Sociocultural Antropology

2005 – 2009

University of California San Diego

As well:

I am one of only 15 people in Spain who has the CrossFit Level 3 Certification ™ (CF-L3 Certified CrossFit Trainer)

I have extensive experience as a CrossFit trainer ™, Kettlebells and Fitness Bootcamps programs for all levels

Contact me

My story

Hello! My name is Gillian

When I was growing up, food was always a complicated issue for me.

I hated vegetables, loved sugary foods, and drank soda whenever I could get my hands on it.

After a chubby childhood, I went off to university and gained almost 10 kilos as a result of no exercise, too much beer and crappy cafeteria food. I didn’t feel good in my own skin (or my clothing!) and I didn’t like what I saw in the mirror… so I knew something had to change. That was 2007. 

When did I decided to change

I knew I should start to care better of myself but the problem was I didn’t know where to start from.

I knew less beer and more vegetables was probably a good idea, so I started with that! For exercise, I started trying to go to the gym once or twice each week, and began attending a bootcamp class with some friends.

With a bit of work on the QUALITY of my nutrition plus more overall movement in my daily life, I noticed my clothing fit better and I was liking what I saw in the mirror.

Nutrition can be complex

That was a good start, but in order to reach my goals, I needed to take my nutrition a step further. Finding the balance between eating the right types of foods and eating the right AMOUNT can be tough!

After moving to Barcelona, I started Olympic Weightlifting, and in order to fit into my weight class category, I found I needed to drop a few more kilos. A friend of mine who had competed on an international level in body building suggested “macro-counting” (a form of flexible dieting)- basically, weighing and measuring my food intake and have a precise count of carbs, protein and fat.

By adding precision to my diet, I was not only able to lose body fat, but able to maintain (and even improve!) my strength in my sport.

Since then, I have found a point in which I am able to maintain a body composition and performance level that works well for my lifestyle without weighing and measuring what I eat every day… because no one wants to eat out of tupperware for the rest of their lives.

My experience as a nutritionist

It has been a long road to becoming a Nutritional Coach! Over the last 10 years, I have studied and experimented myself with tons of different diet theories and nutrition approaches:

  • Low carb or keto
  • Vegetarian
  • Paleo
  • Gluten-free

I also began to realize that nutrition impacted more than just physical appearance and I wanted to continue learning more about it.

So I took the holistic nutrition course at the Institute of Integrative Nutrition in the USA in 2011 and I also have the Level L1 certificate from the prestigious Canadian company Precision Nutrition (which I also took in the USA). In 2017 I studied Sports Nutrition with the ANEF Academy in Barcelona and I have three years of experience as a Crossfit, Kettlebell and Boot Camp Coach.

I am also very proud to say that I am one of only 15 people in Spain who have the title of CrossFit Level 3 Trainer (CCFT).

In my free time I am passionate about learning about nutrition and I am always reading, studying and experimenting both in the kitchen and outside to find out what really works in nutrition and health.


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