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EDITORIAL
Functional foods
European Journal of Clinical Nutrition (2010) 64, 657–659;
doi:10.1038/ejcn.2010.101
Humankind has always been interested in food. This,
although a platitude, is worth remembering. The science of
functional foods is the convergence of two major events in
our lives—diet and health. The association between food and
disease is widely recognized as the bedrock of preventive
nutrition. The concept of ‘functional foods’ is often cited as a
newly emerging field. However, this idea was first described
in the ancient Vedic texts from India, and in Chinese
traditional medicine. The vision to develop functional foods
reflects the oriental philosophy that: ‘Medicine and food
have a common origin’.
The conviction to develop functional foods first emerged
in Japan in the 1980s when faced with escalating health-care
costs. The Ministry of Health and Welfare initiated a
regulatory system to approve certain foods with documented
health benefits (Arai, 1996). Its primary objective was to
improve the health of the nation’s ageing population.
In 1984, the Ministry of Education, Science and Culture,
an ad hoc group in Japan commenced a national project to
explore the link between food and medical sciences (Ohama
et al., 2006). The term ‘functional food’ first appeared
in 1993 in the Nature news magazine under the heading
‘Japan explores the boundary between food and medicine’
(Swinbanks and O’Brien, 1993).
Functional food is essentially a marketing term and
globally, it is not recognized by law. Several definitions for
functional foods exist. These include, that given by Health
Canada: ‘Similar in appearance to conventional food, consumed
as part of the usual diet, with demonstrated physiological benefits,
and/or to reduce the risk of chronic disease beyond basic
nutritional functions’ (Health Canada, 2000). Other defini-
tions include that from the International Food Information
Council (IFIC), that is functional foods are, ‘foods or dietary
components that may provide a health benefit beyond basic
nutrition’ (Bagchi, 2008). The International Life Sciences
Institute of North America (ILSI) has defined functional
foods as, ‘foods that by virtue of physiologically active food
components provide health benefits beyond basic nutrition’
(Bagchi, 2008). The European Commission Concerted Action
on Functional Food Science in Europe regards a food as
functional, ‘if it is satisfactorily demonstrated to affect benefi-
cially one or more target functions in the body, beyond adequate
nutritional effects, in a way that is relevant to either an improved
state of health and well-being and/or reduction of risk of disease’
(Consensus document, 1999).
Today, Japan is the only country that recognizes functional
foods as a distinct category, and the Japanese functional food
market is now one of the most advanced in the world.
Known as foods for specified health use (FOSHU), these are
foods composed of functional ingredients that affect the
structure and/or function of the body and are used to
maintain or regulate specific health conditions, such as
gastrointestinal health, blood pressure and blood cholesterol
levels (Hosoya, 1998). As of July 2008, nearly 500 food
products had been granted FOSHU status in Japan.
In 1912, Casimir Funk presented a seminal paper propos-
ing the ‘Vitamine’ theory (McCollum, 1957). He proposed
that the absence of certain minute substances in foods rather
than the presence of germs caused disease. The theory and
concept that he developed has had a direct bearing on the
development of functional foods. The concept of functional
foods has now been extended to include food constituents
that reduce the risk of chronic disease (Plat and Mensink,
2001). Today we are at a new frontier in nutritional science.
The transition from ‘adequate’ to ‘optimal’ nutrition. It is
here that functional foods will have a pivotal role in
reducing diet-related chronic diseases.
Functional foods may be broadly grouped into the
following:
Conventional food containing naturally occurring bioac-
tive substance. An example could be b-glucan in oat bran
to lower blood cholesterol;
Foods that have been modified, by enrichment or other
means, with bioactive substances. An example could be
margarine that contains added phytosterol that is known
to lower serum cholesterol;
Synthesized food ingredients, such as some specialized
carbohydrates intended to have probiotic effects.
A functional food can be (1) a natural food, (2) a food to
which a component has been added, (3) a food from which
a component has been removed, (4) a food where one or
more components has been modified, (5) a food in which
the bioavailability has been modified or (6) any combination
of these. Examples of these are shown in Table 1.
A food product can be made functional by using any of
the five approaches listed below:
(1) Eliminating a component known to cause or identified
as causing a deleterious effect when consumed (for
example, an allergenic protein).
European Journal of Clinical Nutrition (2010) 64, 657–659
&
2010 Macmillan Publishers Limited All rights reserved 0954-3007/10
www.nature.com/ejcn
(2) Increasing the concentration of a component naturally
present in food to a point at which it will induce
predicted effects (for example, fortification with a
micronutrient to reach a daily intake higher than the
recommended daily intake).
(3) Adding a component that is not normally present in
most foods and is not necessarily a macronutrient or
a micronutrient, but for which beneficial effects have
been shown (for example, non-vitamin antioxidant or
prebiotic fructans).
(4) Replacing a component, usually a macronutrient
(for example, fats), intake of which is usually exces-
sive and replacing it with a component for which
beneficial effects have been shown (for example,
modified starch).
(5) Increasing bioavailability or stability of a component
known to produce a functional effect or to reduce the
disease-risk potential of the food.
One of the examples often quoted within the functional food
sector is the introduction of margarine spreads fortified with
plant sterols in the UK. Although there is limited information
related to the impact of diet-based intervention on disease
prevention and health-care cost reduction, a few case studies
are available to support the use of functional foods to improve
the health of the populations. A reduction of low-density
lipoprotein cholesterol by 10–15% was observed through the
consumption of plant stanol esters at levels of 2–3 g per day
(Nguyun, 1999). If this risk reduction is achieved in practice,
heart disease patient numbers in the UK would reduce by
250 0000 and save the UK health-care system d433 million.
The National Health Service in the UK estimated that these
products have the potential to lower the health-care costs for
cardiovascular disease by d100 million per year.
Despite the emerging interest and global consumption of
functional foods, the recent opinion of European Food Safety
Authority (EFSA) on article 13.1 for health claims has caused
considerable concern and consternation among nutritionists
and food manufacturers alike (Hughes, 2009). Of the 416
claims evaluated, fewer than 2% were approved, a rejection
rate that calls into question the process itself. Claims related to
antioxidants, bowel function, neurological function and
glycaemic index were rejected. The rejection of carbohydrates
and their glycaemic indices appears to be at variance with
other international bodies. The World Health Organization,
for example, not only recognizes the concept of glycaemic
index, it advocates its wide usage (FAO/WHO, 1998). Yet EFSA
states that ‘carbohydrates that induce a low/reduced glycae-
mic response and carbohydrates with a low glycaemic index
(o55), which are the subject of the health claims are not
sufficiently characterised’. This is hard to reconcile as the
carbohydrate content of several foods has not only been
carefully characterized but also recognized as being metabo-
lized and absorbed differently. Even more curious is the
approval of b-glucan for lowering cholesterol but not for
lowering blood glucose. These anomalies highlight the
challenges ahead. EFSA urgently needs to balance scientific
judgement and consumer protection with the promotion and
nurturing of food innovation within Europe. There is an
urgent need for EFSA and the food industry to recalibrate each
other’s expectations. If not, EFSA will be perceived as a
harbinger of doom for the industry and scientists alike, stifling
creativity and ultimately the consumer will be the loser.
As the head of the Functional Food Centre in Oxford
whose primary goal is to evaluate and assess functional
benefits of foods and ingredients and to provide evidence-
based science to substantiate health claims, I welcome the
importance given to functional foods by the European Journal
of Clinical Nutrition by publishing this special issue on
functional foods based on peer-reviewed reviews and articles
accepted by the Journal. EJCN should be commended as
it has continued to support this growing new area of
nutritional science by consistently promoting the publica-
tion of evidence-based studies in this important field.
CJ Henry
Human Nutrition, Functional Food Centre,
Oxford Brookes University, Oxford, UK
E-mail: jhenry@brookes.ac.uk
References
Arai S (1996). Studies on functional foods in Japan. Bioscience
Biotechnol Biochem 60, 9–15.
Arvanitoyannis IS, Van Houwelingen-Koukaliaroglou M (2005).
Functional foods: a survey of health claims, pros and
cons, and current legislation. Crit Rev Food Sci Nutr 45,
385–404.
Table 1 Categories of functional foods
Category Example
Basic food Carrots (containing the anti-oxidant b-carotene)
Processed foods Oat bran cereal
Processed foods with added ingredients Calcium-enriched fruit juice
Food enhanced to have more of a functional component Tomatoes with a higher levels of lycopene
Isolated, purified preparations of active food ingredients (dosage form) Isoflavones from soy
b-Glucan from oat bran
Adapted from Arvanitoyannis and Van Houwelingen-Koukaliaroglou (2005).
Editorial
658
European Journal of Clinical Nutrition
Bagchi D (ed). (2008). Neutraceutical and Functional Food Regulations.
Elsevier: New York.
Consensus Document (1999). Scientific concepts of func-
tional foods in Europe consensus document. Br J Nutr 81,
S1–S27.
Food and Agriculture Organisation/World Health Organisation
(1998). Carbohydrates in human nutrition: report of a joint
FAO/WHO expert consultation, FAO Food and Nutrition paper 66,
Rome.
Health Canada (2000). Standards of evidence for evaluating foods
with health claims. Fact sheet 1. November 2000.
Hosoya N (1998). Health claims in Japan—foods for specified health
uses and functional foods. J Nutr Food 1, 1–11.
Hughes N (2009). Health claims thrown into disarray by EFSA
rejections. The Grocer, 10 October: 12–13.
McCollum EV (1957). A History of Nutrition. The Riverside Press:
Cambridge, MA.
Swinbanks D, O’Brien J (1993). Japan explores the boundary between
food and medicine. Nature 364, 180.
Nguyun TT (1999). The cholesterol-lowering action of plant stanol
esters. JNutr129, 2109–2112.
Ohama H, Ikeda H, Moriyama H (2006). Health foods and foods with
health claims. Toxicology 221, 95–111.
Plat J, Mensink RP (2001). Effects of plant sterols ands stanols on
lipid metabolism and cardiovascular risk. Nutr Metab Cardiovasc
Dis 11, 31–40.
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European Journal of Clinical Nutrition