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Bellini, M., Gambaccini, D., Usai-Satta, P., De Bortoli, N., Bertani, L., Marchi, S., & Stasi, C. (2015). Irritable bowel syndrome and chronic constipation: Fact and fiction. World journal of gastroenterology, 21(40), 11362–11370. https://doi.org/10.3748/wjg.v21.i40.11362. Retrieved 4 February 2021.
Reiland, H., & Slavin, J. (2015). Systematic Review of Pears and Health. Nutrition today, 50(6), 301–305. https://doi.org/10.1097/NT.0000000000000112. Retrieved 4 February 2021.
Lee, L. (n.d). 5 Foods to Improve Your Digestion. John Hopkins. Retrieved 4 February 2021, from https://www.hopkinsmedicine.org/health/wellness-and-prevention/5-foods-to-improve-your-digestion
Wikiera, A., Irla, M., & Mika, M. (2014). Prozdrowotne właściwości pektyn [Health-promoting properties of pectin]. Postepy higieny i medycyny doswiadczalnej (Online), 68, 590–596. https://doi.org/10.5604/17322693.1102342. Retrieved 4 February 2021.
How to Improve Your Digestive Track Naturally. (2020). Cleveland Clinic. Retrieved 4 February 2021, from https://health.clevelandclinic.org/how-to-improve-your-digestive-track-naturally/
Berries: Bursting With Health Benefits. (n.d). Canadian Society of Intestinal Research. Retrieved 4 February 2021, from https://badgut.org/information-centre/health-nutrition/berries-bursting-with-health-benefits/
The nutrition source: apple. (n.d). Harvard T.H. Chan. Retrieved 4 February 2021, from https://www.hsph.harvard.edu/nutritionsource/food-features/apples/
Muss, C., Mosgoeller, W., & Endler, T. (2013). Papaya preparation (Caricol®) in digestive disorders. Neuro endocrinology letters, 34(1), 38–46. Retrieved 4 February 2021.
Lever, E., Scott, S., Louis, P., Emery, P., & Whelan, K. (2019). The effect of prunes on stool output, gut transit time and gastrointestinal microbiota: A randomised controlled trial. Clinical Nutrition, 38(1), 165-173. doi: 10.1016/j.clnu.2018.01.003. Retrieved 4 February 2021.
Bellini, M., Gambaccini, D., Usai-Satta, P., De Bortoli, N., Bertani, L., Marchi, S., & Stasi, C. (2015). Irritable bowel syndrome and chronic constipation: Fact and fiction. World journal of gastroenterology, 21(40), 11362–11370. https://doi.org/10.3748/wjg.v21.i40.11362. Retrieved 4 February 2021.
Reiland, H., & Slavin, J. (2015). Systematic Review of Pears and Health. Nutrition today, 50(6), 301–305. https://doi.org/10.1097/NT.0000000000000112. Retrieved 4 February 2021.