Plant-based diets risk worsening brain health nutrient deficiency
Author: Ingrid Torjesen
The promotion of plant-based and vegan diets for the good of the planet is commendable, but risks worsening an already low intake of an essential nutrient involved in brain health, warns* a nutritionist in the online journal BMJ Nutrition, Prevention & Health.
To make matters worse, the UK government has failed to recommend or monitor dietary levels of this nutrient – choline - found predominantly in animal foods, wrote Dr Emma Derbyshire, of Nutritional Insight, a consultancy specialising in nutrition and biomedical science.
Choline is an essential dietary nutrient, and the amount produced by the liver is not enough to meet the requirements of the human body. Choline is critical to brain health and also influences liver function, with shortfalls linked to irregularities in blood fat metabolism as well as excess free radical cellular damage.
The primary sources of dietary choline are found in beef, eggs, dairy products, fish, and chicken, with much lower levels found in nuts, beans, and cruciferous vegetables, such as broccoli.
In 1998, the US Institute of Medicine recommended minimum daily intakes, ranging from 425 mg/day for women to 550 mg/day for men, and 450 mg/day and 550 mg/day for pregnant and breastfeeding women, respectively, because of the critical role the nutrient has in foetal development. In 2016, the European Food Safety Authority published similar daily requirements.
However, surveys show that choline intake, on average, falls short of these recommendations.
“This is… concerning given that current trends appear to be towards meat reduction and plant-based diets,” said Dr Derbyshire.
She also does not understand why choline does not feature in UK dietary guidance or national population monitoring data.
“Given the important physiological roles of choline and authorisation of certain health claims, it is questionable why choline has been overlooked for so long in the UK,” she said. “Choline is presently excluded from UK food composition databases, major dietary surveys, and dietary guidelines.”
It may be time for the UK government’s independent Scientific Advisory Committee on Nutrition to reverse this, she suggested.
“More needs to be done to educate healthcare professionals and consumers about the importance of a choline-rich diet, and how to achieve this,” she explained.
“If choline is not obtained in the levels needed from dietary sources per se then supplementation strategies will be required, especially in relation to key stages of the life cycle, such as pregnancy, when choline intakes are critical to infant development,” she concludes.
*Derbyshire E. Could we be overlooking a potential choline crisis in the United Kingdom? BMJ Nutrition, Prevention & Health 2019;bmjnph-2019-000037. DOI: 10.1136/bmjnph-2019-000037