The Feingold diet (also known as the Feingold Program or KP Diet) is a type of exclusion diet which requires the individual to avoid artificial additives and salicylates.
The Feingold diet is based on the idea that some additives (such as synthetic colourings, flavourings, and preservatives) are harmful.
It is also based on the idea that salicylates (which are natural plant substances found in some foodstuffs such as citrus fruits and some medicines such as aspirin) are harmful.
The Feingold Association of the United States claims that the diet can be used to treat people with a wide range of conditions including autism and attention deficit hyperactivity disorder.
It also states that it can be used to help tackle a wide range of mental and physical health problems including gastrointestinal problems and sleep disturbances.
The National Institute for Health and Care Excellence (NICE) made the following observations on the use of exclusion diets for autistic adults:
“... there is very little evidence regarding safety and efficacy for exclusion diets ... for the treatment of autism”.
Eating a healthy, balanced diet is recommended for everybody in order to maintain good health. Anyone with a particular condition (in addition to or separate from autism) may be recommended to follow a special diet by a dietitian and this should be followed on an individual basis.
The Food Standards Authority has reported that there is some research to suggest that certain artificial food colours and the preservative sodium benzoate could be linked to increased hyperactivity in some children. However, to date, we have been unable to identify any studies into the effects of the Feingold diet or other additive-free diets on autistic people published in English-language, peer-reviewed journals.
Determining if the Feingold diet has any significant benefits for autistic individuals is therefore not currently possible. We must wait until further research of sufficiently high quality has been completed.
The Feingold diet can involve significant inconvenience and cost, as well as significant limitations on what you can eat. Because of this, we cannot recommend its use. However, because additive-free diets are commonly used interventions for autistic people we strongly recommend that further research is undertaken into these diets.
This research should take the form of small scale pilot studies which use scientifically robust, experimental methodologies. It should also investigate if there are different subsets of autistic individuals (such as those with gastrointestinal problems or those with intolerance to additives) who might benefit most from the diet.
Please read our Disclaimer on Autism Interventions
According to the Feingold Association of the United States website, accessed on 2 July 2013, The aim of the Feingold Diet is to “determine if certain foods or food additives are triggering particular symptoms” and then to manage those symptoms by excluding those foods or food additives from the diet.
Some researchers have suggested that the Feingold diet, like other diets which exclude certain foodstuffs, may work because some people, including some autistic people, are allergic to those foodstuffs. For example, according to De Theije et al (2014),
“Based on clinical and preclinical observations, it seems feasible to hypothesize that allergic reactions to foods indeed trigger or worsen the manifestation of neurodevelopmental disorders in at least a subset of patients. In children with ASD, these allergic reactions could be both IgE as non-IgE-mediated, while in ADHD, it is more likely that non-IgE-mediated, cell-mediated, or non-allergic responses to foods are involved. We hypothesize that both prenatal and postnatal allergic immune activation regulate complex, but critical, neuroimmune interactions and therefore affect neurodevelopment and brain function. “
Please note:
According to the Feingold Association of the United States website, accessed on 2 July 2013, the Feingold program can help with behaviour, learning and health problems.
Behaviour problems include marked hyperactivity, impulsive actions, compulsive actions, and emotional concerns.
Learning problems include short attention span, neuro muscular involvement, cognitive and perceptual disturbances.
Health problems include frequent physical complaints and sleep problems.
It also claims a success rate for families following the diet correctly at over 80%.
According to the Feingold Association of the United States website, accessed on 2 July 2013,
“Although foods / additives can induce many different symptoms in different people, the majority of families who use the Feingold Program do so to help a family member with behavior and/or learning problems”.
The website listed a number of groups who may benefit including those with a wide range of conditions including ADD/ADHD, allergy, asthma, autism/PDD)/Asperger syndrome, conduct disorder, depression, eczema, gastrointestinal (GI) problems, learning difficulties, Tourette syndrome etc.
According to the Feingold Association of the United States website, accessed on 2 July 2013,
“The Feingold Program (also known as the Feingold Diet) is a test to determine if certain foods or food additives are triggering particular symptoms. It is basically the way people used to eat before “hyperactivity” and “ADHD” became household words, and before asthma and chronic ear infections became so very common.”
It goes on to say,
“It is a new way of shopping and eating that combines old-fashioned nutrition with modern convenience. We guide you through the process, step by step.
“First, we teach you how to determine if certain food additives or foods are triggering undesirable symptoms.
“Next, we show you how to find the food you enjoy, but in a more natural version. We also guide you to finding healthier non-food products.
“Then we show you how to comfortably make these changes a part of your life.
“Finally, we provide continual updates as products change. We share the tips we have learned so that you can streamline your shopping and have more free time to enjoy feeling good.’
In practice, the Feingold Diet requires the individual to avoid some additives (such as synthetic colourings, flavourings, and preservatives) as well as salicylates (natural plant substances found in some foodstuffs and medicines).
If you are following the Feingold diet, you should ensure that the rest of your diet is healthy and well-balanced.
Because it can be difficult to balance your diet, we strongly recommend that you seek advice from a responsible health professional such as a health visitor or general practitioner (GP). This may lead to a referral to a dietitian – in particular one with experience of working with autistic individuals.
The cost of the Feingold diet depends on things like whether the whole family is following the diet, whether you are buying or making meals yourself, where you are buying the foodstuffs from and so on.
In practice, the major cost of following the Feingold diet is usually buying additive-free or low-salicylates foodstuffs, which are sometimes more expensive than foodstuffs which contain these things.
There may be additional costs for any materials you buy (such as recipe books or DVDs).
According to the Feingold Association of the United States website, accessed on 2 July 2013,
“Its not possible to predict how long the diet will take to have an effect since there are so many variables. We can look back, however, and see how others have responded. It is fairly common to see a clear, noticeable improvement in as little as 3 days, but some people take 2 to 3 weeks. A minority of people report that the symptoms temporarily got worse before they got better. A person who is not on medication is likely to have a faster response than one who is (especially if the medicine is artificially colored!).”
There is no consensus for how long someone should continue on the diet, if the trial has been successful. However some people recommend that the individual stays on the diet for life, since it is feared he or she may regress if the diet is not followed.
According to the Feingold Association of the United States website, accessed on 2 July 2013,
“The majority of the foods can come from your neighborhood supermarket. You might have to go to a health food store to get natural toothpaste and natural lollipops, or if you prefer, they can be mail-ordered from suppliers who cater to Feingold families.”
There are no formal qualifications for people using the Feingold diet for since any individual, parent or carer can choose to implement the diet.
However, if you are contemplating a significant change of diet you should definitely seek advice from a qualified medical practitioner, paediatrician and/or dietitian.
The British Dietetic Association has information about qualified dieticians in the UK.
There are many potential risks to withdrawing normal or regular foods, especially from young children. For example, according to Mari-Bauset et al (2015), “The combination of food selectivity and restrictive diets can make it difficult to achieve an adequate diet, consequently resulting in an excessive intake of certain foods and/or deficiencies and malnutrition due to insufficient amounts of other foods. In turn, inadequate intakes may lead to the development of chronic and degenerative conditions that tend to appear in the third or fourth decade of life (cardiovascular disease, high blood pressure, diabetes, dyslipidaemia, and osteoporosis, among others) or even earlier, in the case of menstrual disturbances, sleep apnoea, and psychosocial disorders”.
There are no known contraindications (something which makes a particular treatment or procedure potentially inadvisable) for the Feingold diet.
However, some autistic people eat only a limited range of food. They already have a less healthy and less varied diet than other people. Restricting what they eat even further may reinforce those rigid eating patterns. It may also increase their social isolation (because they can’t eat the same food as their peers at parties or restaurants).
If you have concerns about your own diet or your child's diet you should seek advice from a responsible health professional such as a health visitor or GP. This may lead to a referral to a dietitian – in particular one with experience of working with autistic individuals.
According to the Feingold Association of the United States
‘In the late 1960’s and early 1970’s, Dr. Feingold developed what he named the “KP” diet. (It was based on the Lockey allergy diet used at the Mayo Clinic.)
‘Dr. Feingold found that he could help about half of the children who were diagnosed with what was then called hyperkinesis or hyperactivity. The media changed the name of the KP Diet to the Feingold Diet, and parent support groups chose the name “Feingold Associations” to honor the doctor who had helped their families’
We have been unable to identify any studies into the effects of the Feingold diet (or other additive-free diets or low-salicylate diets for autistic people published in English-language, peer-reviewed journals.
The Feingold Association of the United States website lists various research studies but none of these appears to be an efficacy study of the Feingold diet for autistic people.
We found a number of research reviews which looked at the Feingold diet for people with other conditions, particularly attention deficit hyperactive disorder. In general, these reviews concluded that the Feingold diet is unlikely to provide any significant benefits. For example,
We identified a single review which looked at salicylates as a treatment for various conditions including attention deficit hyperactivity disorder.
The Food Standards Authority website, accessed on 28 June 2017, reported that there is some research to suggest that certain artificial food colours and the preservative sodium benzoate could be linked to increased hyperactivity in some children (irrespective of whether they happen to be autistic).
We have been unable to identify any studies into the effects of the Feingold diet for autistic people published in English-language, peer-reviewed journals so we cannot comment on the status of these.
We have been unable to identify any studies into the Feingold diet that are currently underway. If you know of any studies we should include please email info@researchautism.net with the details.
We have been unable to identify any studies into the effects of the Feingold diet for autistic people published in English-language, peer-reviewed journals.
We found a number of research reviews which looked at the Feingold diet for people with other conditions, particularly attention deficit hyperactive disorder. In general, these reviews concluded that the Feingold diet is unlikely to provide any significant benefits.
The Food Standards Authority website reported that there is some research to suggest that certain artificial food colours and the preservative sodium benzoate could be linked to increased hyperactivity in some children.
Determining if the Feingold diet has any significant benefits for autistic individuals is therefore not currently possible. We must wait until further research of sufficiently high quality has been completed.
There is a need for small scale pilot studies which use scientifically robust, experimental methodologies to determine if the Feingold diet provides any benefits for autistic people.
These studies should investigate if there are different groups of autistic individuals (such as those with gastrointestinal problems or those with intolerance to additives or salicylates) who might benefit most from the diet.
These studies should also investigate which parts of the diet (exclusion of additives, or salicylates or both) provide the most benefits to which groups of people.
It may then be possible to determine if further, large-scale trials into the diet are justified.
We have been unable to identify any studies into the effects of the Feingold diet for autistic people published in English-language, peer-reviewed journals.
If you know of any other publications we should list on this page please email info@informationautism.org
Please note that we are unable to supply publications unless we are listed as the publisher. However, if you are a UK resident you may be able to obtain them from your local public library, your college library or direct from the publisher.
This section provides details of other publications on this topic.
You can find more publications on this topic in our publications database.
If you know of any other publications we should list on this page please email info@informationautism.org
Please note that we are unable to supply publications unless we are listed as the publisher. However, if you are a UK resident you may be able to obtain them from your local public library, your college library or direct from the publisher.
The Feingold Association of the United States website contains a range of personal accounts on the use of the diet.
According to the NHS Choices website, accessed on 28 June 2017,
“Food additives are ingredients added to foods for various reasons – for example, to make them last longer.
Common food additives
You’re most likely to see the following types of additives on food labels:
According to the Food Standards Agency website, accessed on 11 September 2017,
“…certain artificial food colours and the preservative sodium benzoate could be linked to increased hyperactivity in some children.”
“A European Union-wide mandatory warning must be put on any food and drink …that contains any of the six colours. The label must carry the warning ‘may have an adverse effect on activity and attention in children.”