The development of food allergies
6.47.A key source of advice for pregnant women is
the midwives who care for them. We invited the Royal College of
Midwives to give evidence about early interventional strategies,
but were disappointed that they were unable to field a representative
to talk to us. Their written response noted that "breast
feeding contains specific immunological properties" which
may "to a certain extent protect children from certain diseases,
especially asthma" so they therefore recommended "exclusive
breastfeeding for the first six months without the introduction
of supplements or solid foods" (p 384). Dr Hyer also noted
that "in terms of primary prevention the best tool is to
breast feed" (Q 659).
6.48.However, Professor Hourihane told us that "any
allergen that a mother ingestswhether it is a food allergen
or anything elsewill be found in breast milk shortly afterwards"
(Q 667). Therefore, Dr Hyer told us that "we know that if
you have severe eczema you may benefit by going on to a hypoallergenic
feed when weaned and not being fed cow's milk formula, but because
of the diagnostic difficulties
selecting which patient
should take on which avoidance pattern is very complicated"
(Q 659).
6.49.Dr Rosenthal commented that "the Cochrane
database on this aspect of prevention or food avoidance in pregnancy
or lactation has been revised more often than any other Cochrane
database, and the conclusion remains entirely the same; that there
is no evidencedefinitely no evidencein terms of
food avoidance during pregnancy, and during lactation possibly"
(Q 661). There is therefore very limited advice which the Government
can recommend.
6.50.Of all food allergens, the most dramatic increase
in prevalence has been seen for peanut allergy. In 2002, the Isle
of Wight Birth Cohort Study reported that peanut sensitisation
had "increased three-fold" in children born between
1994 and 1996, compared to those born in 1989."[108]
The risk factors for the development of peanut allergy are still
uncertain. Previous research had suggested that exposure to peanut
at an early, or even prenatal stage, could increase the risk of
sensitisation. Therefore in The Pregnancy Book, issued
freely to first time mothers, the DH recommends that pregnant
women should avoid peanuts and foods containing peanut products
"if you or your baby's father or any previous children have
a history of hayfever, asthma, eczema or other allergies."[109]
The DH publication, Birth to Five, also recommends that
"breastfeeding mothers who are 'atopic', or those for whom
the father or any sibling of the baby has an allergy, may wish
to avoid eating peanuts or peanut products while breastfeeding,"
and goes further to say that peanuts or peanut products "should
not be given to babies from 'atopic' or 'allergic' families until
they are at least three years old."[110]
6.51.However, during a visit to the Evelina Children's
Hospital, Professor Gideon Lack, Head of Paediatric Allergy, told
us that a number of recent epidemiological studies had suggested
that early peanut consumption, in countries such as Israel, was
associated with a low incidence of peanut allergy in the population.
This had led many academics to believe that repeated exposure
of a child's immune system to peanut allergen at an early age
might result in tolerance. If this was in fact the case, then
Professor Lack noted that DH advice which recommended the avoidance
of peanut, might actually be contributing to the increase in peanut
allergy prevalence.[111]
Currently, there is still no conclusive evidence to prove or disprove
this theory, and as Dr Hyer told us, "we do not really
know the answer" (Q 659).
6.52.To investigate these findings further, the Immune
Tolerance Network has granted Professor Lack funding to carry
out the Learning Early About Peanut allergy (LEAP) study. This
interventional study aims to enrol 480 infants who suffer from
egg allergy, eczema, or both, aged between four and 11 months
old. Half of the infants will be prescribed a diet which contains
peanut regularly, whilst the other half will be told to avoid
peanut products. All of the participants will be asked to provide
occasional blood samples, and will receive allergy testing, dietary
counselling and physical examinations until the age of five. It
is hoped that analysis of the proportion of children in each group
which develops peanut allergy, will help to determine whether
avoidance or consumption reduces the risk of developing the allergy.[112]
6.53.The DH told us that its advice was based upon
the conclusions of the Committee on Toxicity of Chemicals in Food,
Consumer Products and the Environment (COT), which themselves
were based on the "best available evidence when it reported
in 1998." The Department recognised that "the then available
evidence on development of peanut allergy during pregnancy and
weaning was not conclusive but, noting the uncertainty and the
potential for risk of life-threatening anaphylaxis, our advice
on peanut allergy is precautionary" (p 26). Professor Warner,
who was involved in the decision to recommend peanut avoidance,
added that "although it was made in good faith at the time,
based on evidence available, it was indirect evidence rather than
direct evidence. Perhaps we have to be very cautious about any
recommendations we make until we have got good evidence from controlled
intervention rather than just observational studies" (Q 147).
6.54.The effect of Government advice on the prevalence
of peanut allergy has recently been analysed by two research studies
supported by the FSA. The results of one of these studies, published
in April 2007, showed that Government advice concerning peanut
consumption was often "misunderstood by mothers" and
that those who communicated the advice had "not fully explained
who it is targeted at." The report concluded that "the
target population did not necessarily take up this advice"
and that furthermore, some women who did not have a family history
of atopy, at which the advice was not aimed, were avoiding peanuts.
However, in summary it appeared that "maternal consumption
of peanut during pregnancy was not associated with peanut sensitisation
in the infant."[113]
6.55.In the second paper on peanut avoidance, it
was noted that "no other government has issued such advice"
and that "it has been a concern that the advice could possibly
have adversely affected (increased) the prevalence of peanut allergy
in the UK rather than decreasing the prevalence, as was the intention."
However the paper also concluded that "we have not yet ascertained
any positive or negative effect on the prevalence of peanut sensitisation
or peanut allergy of the COT advice."[114]
6.56.When questioned about the adequacy of DH advice,
Mr Lewis said that "if the advice is wrong or damaging or
counterproductive, we ought to change it as quickly as possible"
(Q 860). Following this, we were informed that the FSA "has
already begun the process of identifying and systematically reviewing
the evidence, and a paper will be taken to the COT as soon as
this review is complete. The COT will then consider this evidence
at an open committee meeting and will issue a statement. After
that, the Government will reconsider its advice in the light of
the views of the COT. Given the need to evaluate fully and carefully
all the relevant scientific evidence, this process is likely to
take six to 12 months" (p 322).
KEY RECOMMENDATION:
6.57.It is imperative that work is carried out
to investigate whether peanut consumption or avoidance in early
life significantly affects a child's risk of developing peanut
allergy. We therefore support the work of the Learning Early About
Peanut allergy (LEAP) study. We are very concerned that Department
of Health dietary advice regarding peanut consumption for pregnant
women and infants is based upon evidence that was reported nine
years ago. Recent evidence suggests that this advice has not succeeded
in reducing the prevalence of peanut allergy and may indeed be
counterproductive. We recommend that this advice should be withdrawn
immediately, pending a comprehensive review by the Food Standards
Agency and the Committee on Toxicity of Chemicals in Food, Consumer
Products and the Environment.
THE ROLE OF CHARITIES
6.58.A number of charities provide support for patients
with allergic disorders. Allergy UK is the operational name of
the British Allergy Foundation, a charity which provides "information,
advice and support to people with all types of allergy/intolerances
and their carers" (p 291). Other charities, such as the Anaphylaxis
Campaign, may focus on a particular subgroup of allergy sufferers
or, in the case of Asthma UK and the National Eczema Society,
may deal with conditions that can have both allergic and non-allergic
causes.
6.59.Through the production of leaflets and guidance,
or the use of workshops, helplines, support groups and websites,
charities can provide an extra level of support for patients in
addition to that received from their medical practitioner. There
is a clear need for these services, as Allergy UK reported that
19,554 people used their telephone helpline service from March
2005 to April 2006 (p 291), and Asthma UK told us that it received
"between 7,000 and 10,000 queries a year" (Q 779). Ms
Lindsey McManus, Deputy Information Manager at Allergy UK, explained
that patients phoned their helpline for a range of reasons. This
might include queries about symptoms they were suffering or the
basic question "could I have an allergy?" as well as
questions about treatment such as "where is my nearest allergy
clinic?" and "what type of test might I expect when
I go to the hospital?" (Q 778).
6.60.Charities also provide practical information
about how to manage allergic conditions. For example, Ms McManus
told us that Allergy UK can offer "very practical advice
such as bedding and cleaning. We can also give advice on different
types of tests and alternative testing, should they ask us"
(Q 778). Ms Donna Covey, who spoke to us as Chief Executive of
Asthma UK, explained that the burden of allergic disease is not
only caused by the symptoms, but also by the way in which it "impacts
on your daily life." Asthma UK therefore ran "Kick Asthma
holidays" which educated children about how to cope with
asthma and other allergies. Children attending these courses often
suffered from other allergies in addition to asthma, so at the
start of the holidays children were encouraged to share information
about all their allergies to get them out into the open. Ms Covey
explained that this "normalises it and an understanding of
allergy is a really important part of that work" (Q 780).
6.61.Following concerns that healthcare workers are
not adequately educated about allergies, in some cases charities
may also help to train medical professionals. The Anaphylaxis
Campaign has developed a training programme for school nurses
(p 174) and Allergy UK reported that it "provides education
and training to healthcare professionals via masterclasses and
an increasingly popular on-line e-learning European Diploma in
Allergy accredited by the University of Greenwich" (p 292).
6.62.Furthermore, charities play an important role
carrying out research for, and working with, Government departments
and industry. As an example, following research undertaken by
the Anaphylaxis Campaign, which demonstrated the difficulties
that food allergic consumers faced when buying prepacked foods,
the Anaphylaxis Campaign worked in collaboration with the FSA,
the BRC, the Food and Drink Federation and LACORS to produce labelling
guidance for food businesses.[115]
With regard to occupational allergies, Asthma UK has worked in
collaboration with the HSE, manufacturers and other organisations
to produce a workplace charter to reduce the impact of asthma
in the workplace.[116]
6.63.Considering the important role that allergy
charities play, it was disappointing to hear that they had faced
difficulties in receiving Government funding for their work. Ms
Covey told us that Asthma UK provides "a number of what are
really NHS plus services" but that its applications for funding
often get turned down on the grounds that they overlap with NHS
services. For example, previous applications for its helpline
had been turned down "on the grounds that it overlaps with
NHS Direct," but Ms Covey argued that it provided an additional
service and that "NHS Direct nurses quite rightly often refer
people with asthma to our nurses who can have a detailed chat
about their asthma." Similarly, applications to fund health
promotion materials had been refused "on the grounds that
asthma self-management promotion is the job of the NHS and yet
we know large parts of the health service do that really badly
and when they do it well it is because they are using our materials"
(Q 783).
6.64.Allergy charities play an important role
in providing public advice, but must continue to work together
and with clinical services to avoid duplication of work, and ensure
that consistent, evidence-based policies and public advice are
provided.
92 Statutory Instrument 2004 No. 2824. Similar legislation
was also passed to implement this directive in Wales (S.I. 2004
No. 3022 (W.261), Scotland (S.I. 2004 No. 472) and Northern Ireland
(S.I. 2004 No. 469). Back
93 Food
Standards Agency, Guidance on Allergen Management and Consumer
Information, 2006, pp 28-29. Back
94 McFadden
et al, British Medical Journal 334, 2007, "Allergy
to hair dye," p 220. Back
95 Statutory
Instrument 2004 No. 2152. Back
96 European
Commission Scientific Committee on Consumer Products, Memorandum
on hair dye substances and their skin sensitising properties,
2006, p 5. Back
97 See:
http://europa.eu/rapid/pressReleasesAction.do?reference=IP/07/439&type=HTML&aged=0&language=EN&guiLanguage=en. Back
98 Leitch
et al, International Journal of Environmental Health Research
15, 2005, "Food allergy: Gambling your life on a take-away
meal," pp 79-87. Back
99 op
cit. Food Standards Agency,
Qualitative Research into the Information Needs of Teenagers
with Food Allergy and Intolerance, 2005, p. 38. Back
100 See
www.eatwell.gov.uk. Back
101 See
http://www.europrevall.org/. Back
102 See
http://www.informall.eu.com/default.htm. Back
103 See
http://foodallergens.ifr.ac.uk/. Back
104 Department
of Health, Committee on the Medical Effects of Air Pollutants,
Guidance on the Effects on Health of Indoor Air Pollutants,
2004. Back
105 World
Health Organization, Air quality guidelines for particulate
matter, ozone, nitrogen dioxide and sulfur dioxide, Summary of
risk assessment, 2005. Back
106 Environment
Committee, 6th Report (1990-91): Indoor Pollution (HC 61). Back
107 Council
for Science and Technology, Health Impacts-A strategy across
Government, 2006, pp 5, 7. Back
108 Grundy
et al, Journal of Allergy and Clinical Immunology 110,
2002, "Rising prevalence of allergy to peanut in children:
Data from 2 sequential cohorts," pp 784-789. Back
109 Department
of Health, The Pregnancy Book, 2007, p.12. Back
110 Department
of Health, Birth to Five, 2007, p. 69. Back
111 Note
of the visit to the Evelina Children's Hospital, Appendix 5. Back
112 Note
of the visit to the Evelina Children's Hospital, Appendix 5, and
see www.leapstudy.co.uk. Back
113 Dean
et al., Journal of Human Nutrition and Dietetics 20, 2007,
"Government advice on peanut avoidance during pregnancy-is
it followed correctly and what is the impact on sensitization?,"
pp 95-99. Back
114 Hourihane
et al., Journal of Allergy and Clinical Immunology 119,
2007, "The impact of government advice to pregnant mothers
regarding peanut avoidance on the prevalence of peanut allergy
in United Kingdom children at school entry," pp 1197-1202. Back
115 op
cit. Food Standards Agency,
Guidance on Allergen Management and Consumer Information,
2006. Back
116 op
cit. Asthma UK, Asthma
at Work-Your Charter, 2004. Back