After 2 years of daily sea buckthorn
Twelve boxes and 730 mornings. At this horizon the useful research is no longer short trials but studies that followed tens of thousands of people's eating for decades. A doctor explains what those studies saw and what they cannot say, and a movement coach explains how to keep something this simple going for years.
Dr. Raj wrote the sections on the body and the research. Jade wrote the sections on the long-term ritual, movement for the decades ahead and four new ways to cook with the pouch. Each section says who is speaking. No sea buckthorn trial in people has run two years, so every study below is general nutrition science, observational, and labelled that way. Product figures come from the published nutrition label.
The short answer
Two years is 730 pouches, and no sea buckthorn study has run anywhere near that long. The research that does reach this horizon follows large groups of people eating ordinary diets for decades, and it is about berries and flavonoids in general, not about this berry or this pouch. This part explains what those studies looked at and what they cannot tell you. At two years, the most useful thing to do is keep a simple habit simple.
In this article
Twelve boxes in
Dr. Raj Dhadwal on what two years means
Twelve boxes. Seven hundred and thirty pouches. More than 67,000 hand-picked berries, at 5,640 to a box. At two years the pouch is no longer a plan you are following. It is simply part of the week.
Every earlier part of this series looked at a compartment of the body that renews on its own clock. The blood and the outer skin in the first two months. The slower tissues after that, one stage at a time. By two years, every one of those clocks has gone round many times. Even the slowest compartments discussed in part 5 have had time to reflect what arrives each morning.
That changes the kind of question worth asking. At day 60 the honest question was whether a level had settled. At two years the honest question is a bigger one: what does it mean for a person to eat a berry every day for a long time? No trial can answer that by giving people a food and measuring them a few weeks later. The research that speaks to this horizon works the other way round. It follows very large groups of people for decades, records what they eat, and asks what the long-term eaters of certain foods have in common.
No sea buckthorn study comes anywhere near that length. The longest human trials we found ran about three months. So this part uses the large berry and flavonoid cohorts instead, and labels them clearly as general nutrition science, not as evidence about this berry.
What long studies of berry eaters observed
Dr. Raj Dhadwal on the Nurses' Health Study
General nutrition science, not a sea buckthorn study. The Nurses' Health Study began asking its participants about diet in 1980.1 Between 1995 and 2001, researchers began testing memory and thinking in 16,010 of those women, all aged 70 and over, and repeated the tests twice more at two-year intervals. For each woman they averaged her diet from 1980 up to her first test, so the eating being measured stretched back fifteen years or more.
Women who ate more blueberries and strawberries showed slower rates of decline on those memory and thinking tests, after the researchers adjusted for many other factors. The authors expressed the size of the difference as roughly equivalent to 1.5 to 2.5 years of age within their cohort. Higher intakes of anthocyanidins, the pigments that colour many berries, and of flavonoids overall pointed in the same direction.
That is research on blueberries and strawberries in older women. It is not research on sea buckthorn, and it says nothing about what this pouch does. It is a pattern seen across a very large group of people who, for many years, happened to eat more berries than their neighbours. I include it because it is one of the few places nutrition science has looked at berries in general over this kind of timescale, and because the careful version of the finding is more useful than the headline version.
The larger follow-up on flavonoids
Dr. Raj Dhadwal on 77,335 men and women
General nutrition science, not a sea buckthorn study. A later analysis from Harvard looked at 49,493 women from the Nurses' Health Study and 27,842 men from the Health Professionals Follow-up Study.2 It used up to seven diet questionnaires per person to estimate long-term flavonoid intake, and then asked participants about changes in their own memory and thinking.
Comparing the highest fifth of flavonoid intake with the lowest, the odds of self-reported cognitive decline were 19 percent lower. For anthocyanins, the berry pigments, the odds were 24 percent lower. The strongest associations were for flavones and flavanones, at about 38 and 36 percent lower odds. Many ordinary flavonoid-rich foods, including strawberries, oranges, apples and peppers, were each associated with lower odds on their own.
The people in these studies were not on a programme. They were people whose ordinary week, for decades, happened to include a lot of plants.
Dr. Raj Dhadwal
That last finding is the one I would underline. The signal did not come from one exotic food. It came from a pattern spread across everyday produce. A daily berry fits that pattern well, but it is one part of a plate, not a substitute for the rest of it.
Sea buckthorn comes up here only because it is also a berry that carries flavonoids. The three-month trial in part 2 of this series measured two of them, quercetin and isorhamnetin, rising in the blood. Nobody has studied whether that adds up, over decades, to anything like the associations above, and I would not let a large cohort about other foods carry weight it cannot bear.
How to read a study that lasts decades
Dr. Raj Dhadwal on observational research
Cohort studies like these two are the only practical way to look at eating habits across decades, and they are also easy to misread. Four points help.
They observe, they do not test. Nobody in these studies was told to eat berries. Researchers recorded what people chose to eat and looked for patterns in what happened later. That can point to a relationship. It cannot show that one thing caused another.
Adjustment is not randomisation. The researchers adjusted for many factors that differ between people. That removes some of the noise, but only the noise somebody thought to measure. People who eat plenty of berries for twenty years tend to differ from other people in ways no questionnaire captures.
Relative is not absolute. "Nineteen percent lower odds" compares two groups with each other. It does not tell you how many people in either group were affected, and it says nothing about what would happen to one person who changed their diet.
Self-reported means self-reported. The second study asked people whether they felt their memory and thinking had changed. That is a meaningful thing to ask, and it is also different from a clinical test.
None of this makes the studies worthless. It puts them in their proper place: reasonable evidence that people who eat plenty of plants over decades tend to fare well, and no evidence at all about any single product. That is how I would like you to read every number in this part of the series.
The long game: keep it simple
Jade on keeping it going for years
What Dr. Raj just described is the whole case for patience. The studies that found anything measured years and years of ordinary eating, not a burst of effort. So my advice for the long game is mostly about what not to change.
Keep the anchor. Whatever the pouch got attached to in the first box, leave it attached. Two years in, the anchor is doing the work for you. Moving it because life got busy is the most common way a long habit quietly stops. When a box is half empty, put the next one on the shelf, because running out is the second most common way.
Keep the dose. One pouch a day is the plan. There is no level two to unlock and no reason to start taking two. The pouch you open on day 730 carries exactly what the pouch on day one did, the same 201 mg of vitamin C and the same omega 3, 6, 7 and 9. More is not the next step. The next step is the next morning.
What can change is everything around the pouch. Seasons change. Training blocks come and go. Kitchens change when people move. I would rather someone adjust how they take it than drop it altogether. Straight from the pouch in summer, stirred into breakfast in winter, still one pouch, still every day.
The other thing I would keep is the movement that came with it. If you paired the pouch with a short morning walk in the first box, two years later that walk is probably holding the habit up as much as the pouch is. Keep the pair together. If one slips, the other pulls it back.
Two years in, the anchor is doing the work for you. Do not move it.
Jade
Four ways to cook with it, cold
Jade on the pouch as an ingredient
By now the sour edge is familiar, and most people go looking for it. These four ideas put the pouch inside a meal rather than beside it, and none of them appear earlier in the series. One rule holds for every one: never heat the puree. Where something is cooked, it cools first and the pouch goes on at the end.
1. A glaze for roasted carrots
Roast carrots the way you normally would, with a little oil and salt. Let them cool on the tray for ten minutes or so, until they are warm rather than hot, then spoon the pouch over and toss. The sweetness of the roasted carrot and the sharpness of the berry meet in the middle, and the colour is something else. The oven does its work first, and the puree only arrives once the heat has gone out of the tray.
2. Frozen into a granita
Stir two pouches into a cup of cold water with a spoon of honey, pour it into a shallow tray and put it in the freezer. Every half hour or so, rake it with a fork so it freezes into loose orange crystals rather than a solid block. After two or three hours you have a granita to serve in small glasses after dinner. It is sharp, icy and very pretty, and it is the most grown-up way the berry gets eaten in this series.
3. A quick pickle for red onions
Slice a red onion very thinly into a clean jar. Mix a pouch with a few spoons of cider vinegar, a pinch of salt and a pinch of sugar, pour it over the onion and leave it in the fridge for an hour. The slices turn a bright pink orange and soften into a sharp, crunchy topping for tacos, sandwiches, salads or a plate of eggs. Keep the jar in the fridge and finish it within a few days.
4. Spooned over avocado
Halve a ripe avocado, lift out the stone and fill the hollow with the puree, then finish with flaky salt and a little chilli. Eat it straight from the skin with a spoon. Rich, buttery avocado and the sour berry are an unexpectedly good pair, and it takes less than a minute. It is also a quiet way to make a plain lunch feel finished.
If you would rather keep it simple, the original eight are still in part 1.
What two years looks like
Dr. Raj Dhadwal on what not to expect
Nothing in this research describes a feeling at two years, and it would be wrong to promise one. The cohort studies did not ask people how they felt after eating berries. They measured memory and thinking, or asked people about it, many years later, and they were about berries in general, not this one.
The most useful way to see the pouch at this stage is not as a two-month plan repeated twelve times. It is as one berry that has become part of an ordinary week, sitting alongside everything else you eat. If you want a signal that it is working as a habit, it is simple: you do not think about it any more.
What the cohorts cannot say
Dr. Raj Dhadwal on the distance between a cohort and a pouch
- No sea buckthorn study in people ran two years, and none has measured cognition.
- Both cohort studies are observational. People who eat more berries differ from other people in many ways, and adjusting for other factors cannot remove all of them.
- The berries studied were mainly blueberries and strawberries. Sea buckthorn carries some of the same flavonoid families, such as flavonols, in different amounts, but it was not in these questionnaires.
- Nothing in this article is a claim that sea buckthorn, or this pouch, affects memory, thinking or ageing. The cohort findings describe berries in general.
Movement you can keep for decades
Jade on movement built for the same horizon as the habit
A two-year habit deserves a movement plan built for the same horizon. The training that suits a twelve-week block rarely suits twenty years, and the movement people keep for decades tends to be ordinary rather than heroic.
These are the four I would protect, in this order:
- Walking most days. It is the base everything else sits on, and it is the easiest partner for the pouch.
- Getting down to the floor and back up. Sit on the floor for a few minutes each day and get up a different way each time. It keeps the hips, knees and ankles used to their full range.
- Carrying things. Shopping bags, a backpack, a child. Carry them on purpose rather than avoiding it, with loads that feel comfortable and a tall posture.
- Balance. Stand on one foot while you take the pouch, thirty seconds a side, near something you can hold. It costs nothing and it fits into a moment you already have.
That last one is the most useful pairing I know at this stage. The pouch already takes a few seconds every morning. Spend those seconds on one leg and the two habits fuse into one. After two years the pouch has shown it can last, so give it some movement to carry along.
As with everything in this series, keep it within what feels comfortable, and talk to your own doctor or physiotherapist if you have an injury or a condition that affects your balance.
Questions about the long run
What did the long berry studies actually look at?
Diet questionnaires collected over many years, and later tests or questions about memory and thinking in older adults. In the Nurses' Health Study, women aged 70 and over with a higher long-term intake of blueberries and strawberries showed slower decline on those tests. It is an observational association about berries in general. It cannot show cause, it did not include sea buckthorn, and it is not a promise about any food.
What are flavonoids?
A large family of plant compounds that includes flavonols, flavones, flavanones and anthocyanins. Berries are among the richest sources. A three-month sea buckthorn trial measured the flavonols quercetin and isorhamnetin rising in the blood.
Has sea buckthorn been studied for two years?
Not in people that we could find. The longest human trials we found ran about three months. This part of the series uses long-term cohort studies of berries and flavonoids and labels them as general nutrition science.
Should I change anything after two years?
Keep the parts that make it easy: the same anchor, the same time of day and one pouch a day. Change how you take it if you want variety, for example over roasted carrots once they have cooled, as a granita or in a quick pickle. Never heat the puree.
Is it worth continuing after two years?
That is your call. The cohort studies of berries and flavonoids measured diets over 15 to 22 years, so two years is short by their standards, but they were not studies of this berry and they make no promise about it. Nothing in the research sets an end date for eating a fruit every day.
How much vitamin C is in two years of pouches?
730 pouches at 201 mg each is 146,730 mg of vitamin C, from the label figure.
Sources
- Devore EE, Kang JH, Breteler MMB, Grodstein F. Dietary intakes of berries and flavonoids in relation to cognitive decline. Ann Neurol, 2012;72(1):135-43. PMID 22535616. doi.org/10.1002/ana.23594
- Yeh TS, Yuan C, Ascherio A, Rosner BA, Willett WC, Blacker D. Long-term dietary flavonoid intake and subjective cognitive decline in US men and women. Neurology, 2021;97(10):e1041-e1056. PMID 34321362. doi.org/10.1212/WNL.0000000000012454
A note from both of us. Sea buckthorn is a food, not a medicine, and nothing in this article is medical advice. If you are pregnant, nursing, taking medication or managing a health condition, talk to your doctor before changing your diet.
