
Yes, adults can develop food allergies. Here are 4 types you need to know about
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If you didn’t have food allergies as a child, is it possible to develop them as an adult? The short answer is yes. But the reasons why are much more complicated.
Preschoolers are about four times more likely to have a food allergy than adults and are more likely to grow out of it as they get older.
It’s hard to get accurate figures on adult food allergy prevalence. The Australian National Allergy Council reports one in 50 adults have food allergies. But a US survey suggested as many as one in ten adults were allergic to at least one food, with some developing allergies in adulthood.
What is a food allergy
Food allergies are immune reactions involving immunoglobulin E (IgE) – an antibody that’s central to triggering allergic responses. These are known as “IgE-mediated food allergies”.
Food allergy symptoms that are not mediated by IgE are usually delayed reactions and called food intolerances or hypersensitivity.
Food allergy symptoms can include hives, swelling, difficulty swallowing, vomiting, throat or chest tightening, trouble breathing, chest pain, rapid heart rate, dizziness, low blood pressure or anaphylaxis.
IgE-mediated food allergies can be life threatening, so all adults need an action management plan developed in consultation with their medical team.
Here are four IgE-mediated food allergies that can occur in adults – from relatively common ones to rare allergies you’ve probably never heard of.
1. Single food allergies
The most common IgE-mediated food allergies in adults in a US survey were to:
- shellfish (2.9%)
- cow’s milk (1.9%)
- peanut (1.8%)
- tree nuts (1.2%)
- fin fish (0.9%) like barramundi, snapper, salmon, cod and perch.
In these adults, about 45% reported reacting to multiple foods.
This compares to most common childhood food allergies: cow’s milk, egg, peanut and soy.
Overall, adult food allergy prevalence appears to be increasing. Compared to older surveys published in 2003 and 2004, peanut allergy prevalence has increased about three-fold (from 0.6%), while tree nuts and fin fish roughly doubled (from 0.5% each), with shellfish similar (2.5%).
While new adult-onset food allergies are increasing, childhood-onset food allergies are also more likely to be retained into adulthood. Possible reasons for both include low vitamin D status, lack of immune system challenges due to being overly “clean”, heightened sensitisation due to allergen avoidance, and more frequent antibiotic use.
2. Tick-meat allergy
Tick-meat allergy, also called α-Gal syndrome or mammalian meat allergy, is an allergic reaction to galactose-alpha-1,3-galactose, or α-Gal for short.
Australian immunologists first reported links between α-Gal syndrome and tick bites in 2009, with cases also reported in the United States, Japan, Europe and South Africa. The US Centers for Disease Control estimates about 450,000 Americans could be affected.
The α-Gal contains a carbohydrate molecule that is bound to a protein molecule in mammals.
The IgE-mediated allergy is triggered after repeated bites from ticks or chigger mites that have bitten those mammals. When tick saliva crosses into your body through the bite, antibodies to α-Gal are produced.
When you subsequently eat foods that contain α-Gal, the allergy is triggered. These triggering foods include meat (lamb, beef, pork, rabbit, kangaroo), dairy products (yoghurt, cheese, ice-cream, cream), animal-origin gelatin added to gummy foods (jelly, lollies, marshmallow), prescription medications and over-the counter supplements containing gelatin (some antibiotics, vitamins and other supplements).
Tick-meat allergy reactions can be hard to recognise because they’re usually delayed, and they can be severe and include anaphylaxis. Allergy organisations produce management guidelines, so always discuss management with your doctor.
3. Fruit-pollen allergy
Fruit-pollen allergy, called pollen food allergy syndrome, is an IgE-mediated allergic reaction.
In susceptible adults, pollen in the air provokes the production of IgE antibodies to antigens in the pollen, but these antigens are similar to ones found in some fruits, vegetables and herbs. The problem is that eating those plants triggers an allergic reaction.
The most allergenic tree pollens are from birch, cypress, Japanese cedar, latex, grass, and ragweed. Their pollen can cross-react with fruit and vegetables, including kiwi, banana, mango, avocado, grapes, celery, carrot and potato, and some herbs such as caraway, coriander, fennel, pepper and paprika.
Fruit-pollen allergy is not common. Prevalence estimates are between 0.03% and 8% depending on the country, but it can be life-threatening. Reactions range from itching or tingling of lips, mouth, tongue and throat, called oral allergy syndrome, to mild hives, to anaphylaxis.
4. Food-dependent, exercise-induced food allergy
During heavy exercise, the stomach produces less acid than usual and gut permeability increases, meaning that small molecules in your gut are more likely to escape across the membrane into your blood. These include food molecules that trigger an IgE reaction.
If the person already has IgE antibodies to the foods eaten before exercise, then the risk of triggering food allergy reactions is increased. This allergy is called food-dependent exercise-induced allergy, with symptoms ranging from hives and swelling, to difficulty breathing and anaphylaxis.
Common trigger foods include wheat, seafood, meat, poultry, egg, milk, nuts, grapes, celery and other foods, which could have been eaten many hours before exercising.
To complicate things even further, allergic reactions can occur at lower levels of trigger-food exposure, and be more severe if the person is simultaneously taking non-steroidal inflammatory medications like aspirin, drinking alcohol or is sleep-deprived.
Food-dependent exercise-induced allergy is extremely rare. Surveys have estimated prevalence as between one to 17 cases per 1,000 people worldwide with the highest prevalence between the teenage years to age 35. Those affected often have other allergic conditions such as hay fever, asthma, allergic conjunctivitis and dermatitis.
Allergies are a growing burden
The burden on physical health, psychological health and health costs due to food allergy is increasing. In the US, this financial burden was estimated as $24 billion per year.
Adult food allergy needs to be taken seriously and those with severe symptoms should wear a medical information bracelet or chain and carry an adrenaline auto-injector pen. Concerningly, surveys suggest only about one in four adults with food allergy have an adrenaline pen.
If you have an IgE-mediated food allergy, discuss your management plan with your doctor. You can also find more information at Allergy and Anaphylaxis Australia.
Clare Collins, Laureate Professor in Nutrition and Dietetics, University of Newcastle
This article is republished from The Conversation under a Creative Commons license. Read the original article.
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8 Signs Of Hypothyroidism Beyond Tiredness & Weight Gain
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When it comes to hypothyroidism, most people know to look out for tiredness and weight gain, and possibly menstrual disturbances in those who menstruate. But those symptoms could be caused by very many things, so what more specific signs and symptoms of hypothyroidism should we look out for?
Dr. James O’Donovan shows us in this short video:
The lesser-known signs
Dr. O’Donovan discusses:
- Asteatotic eczema (also called: eczema craquelé): dry, cracked skin with a “crazy paving” appearance, leading to fissures. It’s common on the lower legs, back, torso, and arms, especially in older patients and especially in winter.
- Cold peripheries with pale, dry, coarse skin: cold hands and feet, along with dryness due to decreased sweating; these invariably come together, though the exact link is unclear.
- Yellowish hue to the skin (carotenoderma): yellow-orange discoloration from elevated beta-carotene levels. This can easily be mistaken for jaundice and also occurs in diabetes, liver, and kidney diseases.
- Thin, brittle hair: the hair on one’s head may become dry, coarse, and fall out in handfuls.
- Loss of hair on the outer third of eyebrows: thinning or disappearance of hair in this very specific area.
- Slow-growing, rigid, brittle nails: slowed nail growth due to decreased cell turnover rate. Ridges may form as keratin cells accumulate.
- Myxedema: puffy face, eyelids, legs, and feet caused by tissue swelling from cutaneous deposition.
- Delayed wound healing: is what it sounds like; a slower healing process.
10almonds note: this video, like much of medical literature as well, does focus on what things are like for white people. Black people with hypothyroidism are more likely to see a lightening of hair pigmentation, and, in contrast, hyperpigmentation of the skin, usually in patches. We couldn’t find data for other ethnicities or skintones, but it does seem that most of the signs and symptoms (unrelated to pigmentation) should be the same for most people.
Meanwhile, for more on the above 8 signs, with visuals, enjoy:
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Want to learn more?
You might also like to read:
The Three Rs To Boost Thyroid-Related Energy Levels
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Body by Science – by Dr. Doug McGuff & John Little
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The idea that you’ll get a re-sculpted body at 12 minutes per week is a bold claim, isn’t it? Medical Doctor Doug McGuff and bodybuilder John Little team up to lay out their case. So, how does it stand up to scrutiny?
First, is it “backed by rigorous research” as claimed? Yes… with caveats.
The book uses a large body of scientific literature as its foundation, and that weight of evidence does support this general approach:
- Endurance cardio isn’t very good at burning fat
- Muscle, even just having it without using it much, burns fat to maintain it
- To that end, muscle can be viewed as a fat-burning asset
- Muscle can be grown quickly with short bursts of intense exercise once per week
Why once per week? The most relevant muscle fibers take about that long to recover, so doing it more often will undercut gains.
So, what are the caveats?
The authors argue for slow reps of maximally heavy resistance work sufficient to cause failure in about 90 seconds. However, most of the studies cited for the benefits of “brief intense exercise” are for High Intensity Interval Training (HIIT). HIIT involves “sprints” of exercise. It doesn’t have to be literally running, but for example maxing out on an exercise bike for 30 seconds, slowing for 60, maxing out for 30, etc. Or in the case of resistance work, explosive (fast!) concentric movements and slow eccentric movements, to work fast- and slow-twitch muscle fibers, respectively.
What does this mean for the usefulness of the book?
- Will it sculpt your body as described in the blurb? Yes, this will indeed grow your muscles with a minimal expenditure of time
- Will it improve your body’s fat-burning metabolism? Yes, this will indeed turn your body into a fat-burning machine
- Will it improve your “complete fitness”? No, if you want to be an all-rounder athlete, you will still need HIIT, as otherwise anything taxing your under-worked fast-twitch muscle fibers will exhaust you quickly.
Bottom line: read this book if you want to build muscle efficiently, and make your body more efficient at burning fat. Best supplemented with at least some cardio, though!
Click here to check out Body by Science, and get re-sculpting yours!
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Fast-Pickled Cucumbers
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Pickled vegetables are great for the gut, and homemade is invariably better than store-bought. But if you don’t have pickling jars big enough for cucumbers, and don’t want to wait a couple of weeks for the results, here’s a great way to do it quickly and easily.
You will need
- 1 large cucumber, sliced
- 2 tbsp apple cider vinegar
- 1½ tbsp salt (do not omit or substitute)
- 3 cloves garlic, whole, peeled
- 3 large sprigs fresh dill
- 2 tsp whole black peppercorns
- ½ tsp crushed red pepper flakes
- 1 bay leaf
Method
(we suggest you read everything at least once before doing anything)
1) Mix the vinegar and salt with 1½ cups of water in a bowl.
2) Assemble the rest of the ingredients, except the cucumber, into a quart-size glass jar with an airtight lid.
3) Add the cucumber slices into the jar.
4) Add the pickling brine that you made, leaving ½” space at the top.
5) Close the lid, and shake well.
6) Refrigerate for 2 days, after which, serve at your leisure:
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Making Friends With Your Gut (You Can Thank Us Later)
- Our Top 5 Spices: How Much Is Enough For Benefits? ← 3/5 of these spices are in this recipe!
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Freekeh Tomato Feast
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Fiber-dense freekeh stars in this traditional Palestinian dish, and the whole recipe is very gut-healthy, not to mention delicious and filling, as well as boasting generous amounts of lycopene and other phytonutrients:
You will need
- 1 cup dried freekeh (if avoiding gluten, substitute a gluten-free grain, or pseudograin such as buckwheat; if making such a substitution, then also add 1 tbsp nutritional yeast—for the flavor as well as the nutrients)
- 1 medium onion, thinly sliced
- 1 2oz can anchovies (if vegan/vegetarian, substitute 1 can kimchi)
- 1 14oz can cherry tomatoes
- 1 cup halved cherry tomatoes, fresh
- ½ cup black olives, pitted
- 1 5oz jar roasted peppers, chopped
- ½ bulb garlic, thinly sliced
- 2 tsp black pepper
- 1 tsp chili flakes
- 1 sprig fresh thyme
- Extra virgin olive oil
Method
(we suggest you read everything at least once before doing anything)
1) Place a heavy-based (cast iron, if you have it) sauté pan over a medium heat. Add some olive oil, then the onion, stirring for about 5 minutes.
2) Add the anchovies, herbs and spices (including the garlic), and stir well to combine. The anchovies will probably soon melt into the onion; that’s fine.
3) Add the canned tomatoes (but not the fresh), followed by the freekeh, stirring well again to combine.
4) Add 2 cups boiling water, and simmer with the lid on for about 40 minutes. Stir occasionally and check the water isn’t getting too low; top it up if it’s getting dry and the freekeh isn’t tender yet.
5) Add the fresh chopped cherry tomatoes and the chopped peppers from the jar, as well as the olives. Stir for just another 2 minutes, enough to let the latest ingredients warm through.
6) Serve, adding a garnish if you wish:
Enjoy!
Want to learn more?
For those interested in some of the science of what we have going on today:
- Why You’re Probably Not Getting Enough Fiber (And How To Fix It)
- Eat More (Of This) For Lower Blood Pressure
- Making Friends With Your Gut (You Can Thank Us Later)
- Lycopene’s Benefits For The Gut, Heart, Brain, & More
- Our Top 5 Spices: How Much Is Enough For Benefits?
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Sesame Oil vs Almond Oil – Which is Healthier?
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Our Verdict
When comparing sesame oil to almond oil, we picked the almond.
Why?
We were curious about this one! Were you, or were you confident? You see, almonds tend to blow away all the other nuts with their nutritional density, but they’re far from the oiliest of nuts, and their greatest strengths include their big dose of protein and fiber (which don’t make it into the oil), vitamins (most of which don’t make it into the oil) and minerals (which don’t make it into the oil). So, a lot will come down to the fat profile!
On which note, looking at the macros first, it’s 100% fat in both cases, but sesame oil has more saturated fat and polyunsaturated fat, while almond oil has more monounsaturated fat. Since the mono- and poly-unsaturated fats are both healthy and each oil has more of one or the other, the deciding factor here is which has the least saturated fat—and that’s the almond oil, which has close to half the saturated fat of sesame oil. As an aside, neither of them are a source of omega-3 fatty acids.
In terms of vitamins, there’s not a lot to say here, but “not a lot” is not nothing: sesame oil has nearly 2x the vitamin K, while almond oil has 28x the vitamin E*, and 2x the choline. So, another win for almond oil.
*which is worth noting, not least of all because seeds are more widely associated with vitamin E in popular culture, but it’s the almond oil that provide much more here. Not to get too distracted into looking at the values of the actual seeds and nuts, almonds themselves do have over 102x the vitamin E compared to sesame seeds.
Now, back to the oils:
In the category of minerals, there actually is nothing to say here, except you can’t get more than the barest trace of any mineral from either of these two oils. So it’s a tie on this one.
Adding up the categories makes for a clear win for almond oil!
Want to learn more?
You might like to read:
Avocado Oil vs Olive Oil – Which is Healthier?
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Replacing Sugar: Top 10 Anti-Inflammatory Sweet Foods
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For those with a sweet tooth, it can be challenging to indulge one’s desires while also avoiding inflammation. Happily, Dr. Jia-Yia Lui has scientific insights to share!
Dr. Liu’s Top 10
We’ll not keep them a mystery; they are:
- Grapes
- Goji berries
- Barberries
- Persimmons
- Longans
- Lychees
- Raisins¹
- Applesauce²
- Plums³
- Dates
¹Yes, these are technically also grapes, but there are enough differences that Dr. Liu tackles them separately.
²It makes a difference how it’s made, though.
³And dried plums, in other words, prunes.For more details on all of these, plus their extra benefits and relevant considerations, enjoy:
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Want to learn more?
You might also like to read:
- How to Prevent (or Reduce) Inflammation
- The Not-So-Sweet Science Of Sugar Addiction
- 10 Ways To Balance Blood Sugars
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