Are You Ready For Allergy Season?

For those of us in the Northern Hemisphere, fall will be upon us soon, and we have a few weeks to be ready for it. A common seasonal ailment is of course seasonal allergies—it’s not serious for most of us, but it can be very annoying, and can disrupt a lot of our normal activities.

Suddenly, a thing that notionally does us no real harm, is making driving dangerous, cooking take three times as long, sex laughable if not off-the-table (so to speak), and the lightest tasks exhausting.

So, what to do about it?

Antihistamines: first generation

Ye olde antihistamines such as diphenhydramine and chlorpheniramine are probably not what to do about it.

They are small molecules that cross the blood-brain barrier and affect histamine receptors in the central nervous system. This will generally get the job done, but there’s a fair bit of neurological friendly-fire going on, and while they will produce drowsiness, the sleep will usually be of poor quality. They also tax the liver rather.

If you are using them and not experiencing unwanted side effects, then don’t let us stop you, but do be aware of the risks.

See also: Long-term use of diphenhydramine ← this is the active ingredient in Benadryl in the US and Canada, but safety regulations in many other countries mean that Benadryl has different, safer active ingredients elsewhere.

Antihistamines: later generations

We’re going to aggregate 2nd gen, 3rd gen, and 4th gen antihistamines here, because otherwise we’ll be writing a history article and we don’t have room for that. But suffice it to say, later generations of antihistamines do not come with the same problems.

Instead of going in all-guns-blazing to the CNS like first-gens, they are more specific in their receptor-targetting, resulting in negligible collateral damage:

CSACI position statement: Newer generation H1-antihistamines are safer than first-generation H1-antihistamines and should be the first-line antihistamines for the treatment of allergic rhinitis and urticaria

Special shout-out to cetirizine and loratadine, which are the drugs behind half the brand names you’ll see on pharmacy shelves around most of the world these days (including many in the US and Canada).

Note that these two are very often discussed in the same sentence, sit next to each other on the shelf, and often have identical price and near-identical packaging. Their effectiveness (usually: moderate) and side effects (usually: low) are similar and comparable, but they are genuinely different drugs that just happen to do more or less the same thing.

This is relevant because if one of them isn’t working for you (and/or is creating an unwanted side effect), you might want to try the other one.

Another honorable mention goes to fexofenadine, for which pretty much all the same as the above goes, though it gets talked about less (and when it does get mentioned, it’s usually by its most popular brand name, Allegra).

Finally, one that’s a little different and also deserving of a special mention is azelastine. It was recently (ish, 2021) moved from being prescription-only to being non-prescription (OTC), and it’s a nasal spray.

It can cause drowsiness, but it’s considered safe and effective for most people. Its main benefit is not really the difference in drug, so much as the difference in the route of administration (nasal rather than oral). Because the drug is in liquid spray form, it can be absorbed through the mucus lining of the nose and get straight to work on blocking the symptoms—in contrast, oral antihistamines usually have to go into your stomach and take their chances there (we say “usually”, because there are some sublingual antihistamines that dissolve under the tongue, but they are less common.)

Better than antihistamines?

Writer’s note: at this point, I was given to wonder: “wait, what was I squirting up my nose last time anyway?”—because, dear readers, at the time I got it I just bought one of every different drug on the shelf, desperate to find something that worked. What worked for me, like magic, when nothing else had, was beclometasone dipropionate, which a) smelled delightfully of flowers, which might just be the brand I got, b) needs replacing now because I got it in March 2023 and it expired July 2024, and c) is not an antihistamine at all.

But, that brings us to the final chapter for today: systemic corticosteroids

They’re not ok for everyone (check with your doctor if unsure), and definitely should not be taken if immunocompromised and/or currently suffering from an infection (including colds, flu, COVID, etc) unless your doctor tells you otherwise (and even then, honestly, double-check).

But! They can work like magic when other things don’t. Unlike antihistamines, which only block the symptoms, systemic corticosteroids tackle the underlying inflammation, which can stop the whole thing in its tracks.

Here’s how they measure up against antihistamines:

❝The results of this systematic review, together with data on safety and cost effectiveness, support the use of intranasal corticosteroids over oral antihistamines as first line treatment for allergic rhinitis.❞

~ Dr. Robert Puy et al.

Read in full: Intranasal corticosteroids versus oral H1 receptor antagonists in allergic rhinitis: systematic review of randomised controlled trials

Take care!

From Blue To Green…

We sometimes write about supercentenarians, which word is usually used in academia to refer to people who are not merely over 100 years of age, but over 110 years. These people can be found in many countries, but places where they have been found to be most populous (as a percentage of the local population) have earned the moniker “Blue Zones”—of which Okinawa and Sardinia are probably the most famous, but there are others too.

This is in contrast to, for example “Red Zones”, a term often used for areas where a particular disease is endemic, or areas where a disease is “merely” epidemic, but particularly rife at present.

In any case, back to the Blue Zones, where people live the longest and healthiest—because the latter part is important too! See also:

• Lifespan: how long we live
• Healthspan: how long we stay healthy (portmanteau of “healthy lifespan”)

Most of our readers don’t live in a Blue Zone (in fact, many live in the US, which is a COVID Red Zone, a diabetes Red Zone, and a heart disease Red Zone), but that doesn’t mean we can’t all take tips from the Blue Zones and apply them, for example:

• The basics: The Blue Zones’ Five Pillars Of Longevity
• Going beyond: The Five Key Traits Of Healthy Aging

You may be wondering… How much good will this do me? And, we do have an answer for that:

When All’s Said And Done, How Likely Are You To Live To 100?

Now that we’re all caught-up…

The news from the Blues

A team of researchers did a big review of observational studies of centenarians and near-centenarians (aged 95+). Why include the near-centenarians, you ask? Well, most of the studies are also longitudinal, and if we’re doing an observational study of the impact of lifestyle factors on a 100-year-old, it’s helpful to know what they’ve been doing recently. Hence nudging the younger-end cutoff a little lower, so as to not begin each study with fresh-faced 100-year-olds whom we know nothing about.

Looking at thousands of centenarians (and near-centenarians, but also including some supercentenarians, up the age of 118), the researchers got a lot of very valuable data, far more than we have room to go into here (do check out the paper at the bottom of this article, if you have time; it’s a treasure trove of data), but one of the key summary findings was a short list of four factors they found contributed the most to extreme longevity:

1. A diverse diet with low salt intake: in particular, a wide variety of plant diversity, including protein-rich legumes, though fish featured prominently also. On average they got 57% and 65% of their energy intake from carbohydrates, 12% to 32% from protein, and 27% to 31% from fat. As for salt, they averaged 1.6g of sodium per day, which is well within the WHO’s recommendation of averaging under 2g of sodium per day. As a matter of interest, centenarians in Okinawa itself averaged 1.1g of sodium per day.
2. Low medication use: obviously there may be a degree of non-causal association here, i.e. the same people who just happened to be healthier and therefore lived longer, correspondingly took fewer medications—they took fewer medications because they were healthier; they weren’t necessarily healthier because they took fewer medications. That said, overmedication can be a big problem, especially in places with a profit motive like the US, and can increase the risk of harmful drug interactions, and side effects that then need more medications to treat the side effects, as well as direct iatrogenic damage (i.e. this drug treats your condition, but as the cost of harming you in some other way). Naturally, sometimes we really do need meds, but it’s a good reminder to do a meds review with one’s doctor once in a while, and see if everything’s still of benefit.
3. Getting good sleep: not shocking, and this one’s not exactly news. But what may be shocking is that 68% of centenarians reported consistently getting enough good-quality sleep. To put that into perspective, only 35% of 10almonds readers reported regularly getting sleep in the 7–9 hours range.
4. Rural living environment: more than 75% of the centenarians and near-centenarians lived in rural areas. This is not usually something touted as a Blue Zones thing on lists of Blue zones things, but this review strongly highlighted it as very relevant. In the category of things that are more obvious once it’s pointed out, though, this isn’t necessarily such a difference between “country folk” and “city folk”, so much as the ability to regularly be in green spaces has well-established health benefits physically, mentally, and both combined (such as: neurologically).

See: The health benefits of the great outdoors: A systematic review and meta-analysis of greenspace exposure and health outcomes

And showing that yes, even parks in cities make a significant difference:

The association of green space, tree canopy and parks with life expectancy in neighborhoods of Los Angeles

Want to know more?

You can read the study in full here:

A systematic review of diet and medication use among centenarians and near-centenarians worldwide

Take care!