Leesa Klich Nutrition Interactions Science-based holistic nutrition


About Leesa


Hi, I’m Leesa!  Science nerd.  Health writer.  Holistic Nutritionist.  And creator of Nutrition Interactions; where I love to maximize NUTRITION and minimize INTERACTIONS.

My mission is to bring out the very best from both scientific medical knowledge, and holistic health.  (Yes, they’re both awesome, in different ways).

I want to live in a world where we drop the scientific vs holistic rivalry over WHO is right, and focus on WHAT is right when it comes to improving our collective health.

I love to apply this principle to my favourite areas of focus:

  1. Health writing,

  2. Supplement science, and

  3. Bone nutrition.


1. As a health writer, I create science-based, high-quality, FUN articles for holistic health professionals (and I freaking love it!).


My clients simply don’t have the time to find and go through the research themselves, I mean, they have a wellness practice to run!  And of course, they want consistent, credible articles that can help them become the “go-to” person for their niche.  So that’s where I come in.

My health writing has been featured on:

Trevor King, on behalf of Andrew Saul; Re: Transcription of MegaVitamin Course

“Leesa conscientiously offered to transcribe the entire 10 week MegaVitamin course after being a student in its first offering. She has excellent medical writing skills including medical terminology, spelling, grammar, and punctuation. She efficiently transcribed the video course into a 161-page pdf eBook which we now include as part of subsequent course offerings.  She needed minimal direction, and her work was of very high quality.  And she was a joy to work with as well.

I highly recommend her for health transcription opportunities if you want someone who has experience, and is very accurate and professional. And most importantly – it will be a hassle free journey.”


2. & 3. As a nutritionist, I’m fascinated with the impact of nutrients on our bodies

Do you know the amazing number of roles each nutrient plays in your body?


Do you know that the nutrients in your body can be affected by:

  • Food preparation and storage

  • Supplement interactions

  • Medication interactions and nutrient depletions

  •  Not to mention how difficult it can be to simply get enough nutrition from foods every single day!  I know, not only have I tracked mine, but studies are pretty clear that we’re not getting all the vitamin, minerals, fiber, etc. we need every day.


It never ceases to amaze me, the balance and resilience your body has when it comes to absorbing, distributing, metabolizing and excreting nutrients from foods and supplements; and the thousands of roles they play in contributing to better health.  And scientists are finding out more every day.  (I mentioned that I’m a science nerd, right?).


As a nutritionist, here’s what some of my clients had to say:

“Leesa provided a lot of great nutritional advice.  She was thorough, a great listener, and genuinely cares”  ~Michelle A

“Since working with Leesa I feel like I have more energy and don’t get that midday slump like I used to.  Leesa was very knowledgeable and non-judgmental.  She really seemed to care about what was best for me.  The bottom line is that she just wanted me to obtain optimal health.”  ~Karen V

What exactly is a “science-based holistic nutritionist”?


I have an MSc in Biomedical Toxicology (from the department of Human Biology and Nutritional Science) and am also a Registered Holistic Nutritionist having completed studies in Natural Nutrition.

In addition to my very strong background in both science-based and holistic nutrition, I’ve also completed Dr. Lani Simpson’s Osteoporosis & Bone Health Training Program (fall 2016).

I use all of my in-depth nutrition and bone health training to create optimal nutrition plans which incorporate a nutrient-rich diet, and strategic use of specific supplements.

I make a point of keeping very up-to-date with the latest research without turning it into “sensationalized” or “fear-mongering” headlines.

University taught me many of the physiological and biochemical processes that our bodies undergo to try to maintain balance and health.

Life taught me that I should support these complex systems by:

  • limiting unnecessary exposures to medications and chemicals (no, not all meds and chemicals are bad, some are necessary and life-saving), and

  • providing adequate nutrition to ensure our bodies have the energy and co-factors necessary to carry out these reactions.  From foods first, supplements second.

Natural Nutrition taught me how to accomplish these.


I have worked in R&D in the food industry, as well as Pharmacovigilance (collecting, documenting, reviewing, and reporting adverse events) in the supplement and drug industries for 12-years before becoming a Registered Holistic Nutritionist.


Here are a few random factoids about me:

  • I’m married and have two amazing daughters.

  • While growing up and spending most of my life near Toronto, I have lived in both Western and Eastern Canada.

  • I’m a lifelong knitter.  I also design and create hand made all-natural hats for UrbanOrchard.ca (and I was the model for the 2012/13 season collection).

  • I’m not an awesome chef, but I love baking and my slow-cooker (I guess I’m a “set it and forget it” kinda gal).

  • My favourite book of all time is Your Money or Your Life by Joe Dominguez and Vicki Robin.  I read the whole thing one weekend and still go back to it (not to mention I was one of the first people to buy the 2008 update – so now I have two copies).

  • Before going to the University of Guelph, I completed my diploma in Chemical Engineering Technology.  I then realized I didn’t want to go to university to become an engineer, so changed my focus to Biomedical Science (and married an engineer).  Oh, and I went to grad school too.

  • I have a lot of respect for the scientific process, and truly believe it’s the best method we have to objectively understand our world and ourselves; but I have even more respect for those who are transparent about some of the issues it faces so the scientific community can learn from its mistakes and improve.

  • I’m anaphylactically allergic to Brazil nuts, so I can identify with people who have food allergies.

  • Some of my favourite movies are:

  • The Wizard of Oz (because everyone is born with everything they need, and don’t need to look outside of themselves for validation or a path forward),

  • Crash (because you really don’t know what people are going through, and good people can make bad mistakes).

  • My favourite health writer of all time, who I KNOW I will meet one day, is Julia Belluz.

  • One of my passions is improving public health, which is why I went into pharmacovigilance, and nutrition, and am now a science-based health writer.  I think that educating people about the facts is one step toward having them understand and implement better health choices.  I’ve been toying with the idea of getting my MPH degree one day too.

  • After graduating university and working full-time, I often took part-time courses in Management and Law.

  • I’m a lifelong-learner and online challenge junkie.


I invite you to read more about my unique health philosophy, what the heck does “Nutrition Interactions” mean, or why I think bones are just awesome.

Thank you!


Leesa Klich is a science-based holistic nutritionist living at the intersection of science and holistic health (it’s really, really interesting here!) 🙂

At Nutrition Interactions she empowers women to optimize their bone health using foods, supplements and lifestyle upgrades.  She also helps holistic-minded people taking medications maximize the benefits of good nutrition; as well as writes reliable health articles for holistic health professionals who don’t have the time, and want the credibility.

She has a MSc in Biomedical Toxicology and Nutritional Science, over a decade experience in drug/supplement safety, and is a Registered Holistic Nutritionist. She is also a lifelong learner, and has recently currently completing Dr. Lani Simpson’s Osteoporosis & Bone Health Training Program.  For a list of free health resources, click here.

If you want to know more about my health philosophy, click here.

Thank you!


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