Being inspired by the effect of food on our health and by an idea of “food as medicine”, I am dedicated to help people on their journey to wellbeing. I help people to heal their gut. I believe that our physical and mental health status is affected by our gut health, making the gut an essential point of healing, especially in chronic disease. I also believe in the power of knowledge and education. The way I help people is by educating and by bridging the gap between conventional and non-conventional healthcare so people can make informed choices. I give advice on nutrition, gut health, dietary supplementation and human gut microbiome. I apply the principles of Functional Medicine to make people healthier. I try to find a root cause contributing to your health complaints. Read more to find out if functional medicine approach is what your are looking for.

After seeing my daughters and myself benefiting from improving our nutrition, from healing our guts and from balancing our health foundation, I became inspired to promote health for people of all ages. My daughters from being sick most of the time before our transformation, now enjoy health and their childhood much more. And I turned from an exhausted, sleep deprived, overwhelmed, and nutrient-deficient young mother to a healthier and more energetic version of myself. Like every parent, I love seeing kids happy and healthy, and I’m always looking for ways to make their environment safer and healthier. I’m also acutely aware of the impact of healthy living – physically, emotionally and psychologically – on children.

Why healing the gut? By healing the gut, you improve the intestinal barrier permeability (aka leaky gut), you nourish your internal microbial garden (beneficial bacteria), you optimize your digestion and absorption, you reduce inflammation and as a result you feel better, healthier, you are more energetic, your skin may clear up, your autoimmune disease may go into remission and your mood may stabilize, to name a few benefits.

As a certified functional medicine practitioner, a registered paramedical natural medicine practitioner and a nutritional coach (natural-orthomolecular nutrition/dietary supplementation) I am trained to look for signs of imbalances within your body and ways to restore them by the use of diet, life style, and supplements. I take the time to listen and I understand the value of communication, therefore You and I approach health as a team. 

Few words about my background. I come from Poland and right after completing my Biology MSc, I came to the Netherlands to continue my academic journey. I carried out doctoral research in molecular microbiology at the University of Groningen, earning a doctorate in 2009. I went on to work for one of the top biotech companies, being involved in clinical research and later providing medical information on diseases and medications to professionals and the general public. I am an author of several publications and I have contributed to few books.

Through ProBiotic DIGEST I use my academic, industrial and consulting experience to bridge the gap between theory and practice, to provide well-researched information and nutritional advice in a professional way with your best interest at heart. ProBiotic DIGEST is all about promoting “health”, “life”, “healthy gut and beneficial microbes”, and about helping people to “digest” health related information. My interest in human microbes with a desire to teach about them makes me feel like being “a voice for the voiceless microbes”. I am a partner at the MyMicroZoo and I can give you a hand in understanding your gut (fecal) microbiome.

Find out all about gut health through the blog posts, articles, workshops, consultations and more, and please do let me know your thoughts, so I can grow and serve you better.

Warm regards,


For more information, please visit New Stardom or Polonia.nl portal (in Polish) to read interviews with me, or listen to the Mum’s The World Podcast with me about “The good gut health from birth”, or please check my nomination for the Polish person of the year 2016 (in Polish and in Dutch) in the Netherlands and my participation as a mentor in the Global Mentoring Walk 2017 in Amsterdam.

See My Publications


  • Book „Zadbaj o równowagę mikroflory jelitowej. Popraw odporność i schudnij raz na zawsze”. G. E. Mullin. Polish edition of „The Gut Balance Revolution”.Galaktyka Publisher, April 2016. Translation to Polish: E. Kleszcz. Expert Consultant: J. Krześlak-Hoogland
  • Book „Utracone Mikroby”, M. Blaser. Polish edition of „Missing Microbes”. Galaktyka Publisher, April 2016. Translation to Polish: M. Golachowska. Expert Consultant: J. Krześlak-Hoogland
  • Book „Zdrowie zaczyna się w brzuchu”, E. Sonnenburg & J. Sonnenburg. Polish edition of „The Good Gut”. Galaktyka Publisher, October 2015. Translation to Polish: M. Golachowska. Expert Consultant: J. Krześlak-Hoogland
  • Lipase A gene transcription in Pseudomonas alcaligenes is under control of RNA polymerase Eσ54 and response regulator, LipR. Krzeslak, E. Papaioannou, R. van Merkerk, K. A. Paal, R. P.H. Bischoff, R. Cool, and W. J. Quax. FEMS Microbiol Lett., Apr 2012; 329(2):146-53
  • The role of PvdQ in Pseudomonas aeruginosa virulence under iron limiting conditions. Nadal Jimenez, G. Koch, M. Wahjudi, E. Papaioannou, J. Krzeslak, T. Coenye, R. H. Cool, and W. J. Quax. Microbiology, Jan 2010; 156(1):49-59
  • Heterologous production of Escherichia coli Penicillin G Acylase in Pseudomonas aeruginosa. Krzeslak, P. Braun, R. Voulhoux, R. H. Cool and W. J. Quax. J Biotechnol., Jul 2009; 142(3-4):250-8
  • Pseudomonas as a microbial enzyme factory: the source of industrially potent enzymes and the host for heterologous enzyme production.  J. Krzeslak. Doctoral Thesis. University of Groningen, April 2009
  • Lipase expression in Pseudomonas alcaligenes is under the control of a two-component regulatory system. Krzeslak, G. Gerritse, R. van Merkerk, R. Cool, and W. J. Quax. Appl Environ Microbiol., Mar 2008; 74(5):1402-11
  • Quorum-Quenching acylases in Pseudomonas aeruginosa. J. Krzeslak, M. Wahjudi, and W. J. Quax. In: Pseudomonas Volume 5: A Model System in Biology. Springer Netherlands, 2007, p 429-449
Dr. Joann Krzeslak - Hoogland, Nutrition Expert

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