Mercury is generally concentrated in the meat, not the fat. (It has an affinity for the thiol groups on certain amino acids in protein.) There's certainly other fat-soluble pollutants like PCBs to worry about, but I'd never heard of any fish oil products having significant mercury contamination. I'd love to see the info you've been looking at?
snvzz 35 days ago [-]
Sardine. Most underrated fish ever.
Almost as good as salmon re: Omega-3, but low mercury content.
Cpoll 34 days ago [-]
Worth noting that canned "sardines" can be any of a multitude of unrelated fish, so it's not a good differentiator. Although they tend to be small fish, which is probably a reasonable predictor for lower mercury content.
safeimp 35 days ago [-]
Good advice. Additionally, I’d recommend that with any supplement you evaluate the source you’re buying from. I typically use Nootropics Depot (avoiding linking so this doesn’t look like a full blown add - check my history though, not a shill) and they use 3rd party lab testing to back up claims.
xlbuttplug2 35 days ago [-]
+1. ND and Thorne I trust blindly.
nicce 35 days ago [-]
For Nordic people, Norwegian salmon is likely the worst possible source. Too many bad things going on with that farming.
codr7 35 days ago [-]
I met plenty of Norwegians while living there who refused to eat local Salmon, they have a pretty good idea where it comes from.
alsoforgotmypwd 35 days ago [-]
Yup. It's gross. Ever see the documentary about fish lice and food pellets?
codr7 35 days ago [-]
Worse is the fact that some will escape, spreading their messed up genes and diseases to wild populations.
graypegg 35 days ago [-]
Overlooked one major benefit of salmon though: it tastes great and I would rather eat salmon than krill oil caps ;)
To be fair, there’s low heavy metal contamination salmon on the market; a few sibling comments mentioned wild Alaskan salmon, but I also think farmed salmon tends to be lower in Hg content that the “average” wild salmon.
xlbuttplug2 35 days ago [-]
Any decent brand is using molecularly distilled fish oil.
ninininino 34 days ago [-]
Flax is also really easy to add to a smoothie if you have a decent blender, my recipe: almond milk (any type of milk or yogurt), frozen berries, oats, flax seeds. Just blend it up and eat it for breakfast. Washing blenders after you finish is often easy as you can just add water and a drop of dish soap and then run it once more and then pour it out.
defactor 35 days ago [-]
Wild alaskan salmon
Alaskan people are tested regularly for mercury due to high fish consumption
alsoforgotmypwd 35 days ago [-]
Or, take ALA which is just omega-3 and nothing else.
kiwiana 35 days ago [-]
There are plant based alternatives too, which are derived from kelp.
mettamage 35 days ago [-]
Will check it out, never heard of krill.
codr7 35 days ago [-]
Emptying the oceans of krill isn't a very good idea either unfortunately, and that's pretty much what we're doing.
BenjiWiebe 35 days ago [-]
Some skimming of Wikipedia suggests that our total annual krill harvest is about 1/950th of the amount that predators eat of the main krill species per year.
Also usually the smaller the animal / the farther down the food chain, the faster they reproduce. And some more reading of Wikipedia suggests that krill can reproduce very quickly.
codr7 35 days ago [-]
That's one perspective.
I worked at a Norwegian company that ran 5 huge ships gulping krill 24/7 in the arctic region.
Once you see the scale of operation, it becomes pretty obvious it's a problem, and I'm pretty sure those numbers are manipulated to hide it.
ra 35 days ago [-]
For the most complete analysis of the evidence for Omega 3 (and other miconutrients) the very best resource I've found is Dr Rhonda Patrick: https://www.foundmyfitness.com/topics/omega-3
> It is unclear how omega-3 fatty acids increase the AF risk. Omega-3 fatty acids stabilize the cardiac membrane and protect against arrhythmias, including ventricular arrhythmias, through both direct electrophysiologic actions and positive effects on biological processes involved in atrial remodeling. However, omega-3 fatty acids have direct effects on the activity of cardiac calcium, sodium, and potassium ionic currents, which can alter the duration of the ventricular action potential. Therefore, omega-3 fatty acids may promote re-entrant arrhythmias, despite being anti-arrhythmic in therapeutic conditions. Several previous studies have evaluated the electrical characteristics of the ventricular wall; few studies have evaluated how omega-3 fatty acids influence the atria.
jadbox 35 days ago [-]
EILI5? How compelling is this study against Omega3?
stephen_g 35 days ago [-]
It sounds to me like that short quote is saying (paraphrasing here) that 'studies seems to show omega-3 is beneficial, but theoretically apart from the beneficial mechanisms there could be a harmful mechanism so we're not sure why we don't see that happening'
Jaepa 35 days ago [-]
There's been a fair bit of research people who have diets rich in Omega 3, have better cardiovascular health.
There is no real reliable study's that show consistent benefits from Omega 3 supplements however.
35 days ago [-]
kpfleger 34 days ago [-]
The academic paper this story is based on is here: https://nature.com/articles/s43587-024-00793-y
Despite the linked story title only mentioning omega3, the paper was about 3 interventions, that, vitamin D, exercise and found reduced epigenetic age from the interventionts, with bigger anti-aging benefit as they were combined.
With respect to vitamin D specifically, this isn't by itself good evidence vitamin D reverses aging. But it is consistent with the totality of evidence that being vitamin D deficient probably (causally) speeds aging. And it mildly increases the overall weight of evidence of a connection.
As with much vitamin D research, it would have been better for the intervention to have been titrate vitamin D supplement amount to achieve an optimal target range (eg 30-60ng/ml) rather than using a fixed relative moderate dose (2000IU).
The problem with a fixed dose is that surely some subjects started severely deficient, some mildly, and some had sufficient levels. The moderate but not very high fixed dose will have helped many in the middle group climb out of deficiency, not been enough for many in the 1st group to bring them fully out of deficiency, and been unnecessary for those in the 3rd group, so the study ends up seeing a weaker overall effect averaged over all subjects. This is well known within the vitamin D world, eg see https://x.com/KarlPfleger/status/1732514710715514883, but somehow has not permeated to be widely enough understood, even within the scientific community (or the Hacker News community).
A book I read a couple years ago (I think Peter Attia's) said one of the clearest nutritional studies just sent a weekly bottle of olive oil to half the participants, who had better health results than the control group. They didn't track exactly what people ate, but figured they probably used recipes with olive oil and ended up closer to a Mediterranean diet.
Of course that doesn't necessarily mean it translates to extreme longevity.
aitchnyu 34 days ago [-]
If I had attention of food scientists and motivation, I'll eat better. Is this experiment controlled for that?
DennisP 34 days ago [-]
I haven't read the study itself, but normal practice is to give the control group some kind of attention that doesn't include the intervention you're testing.
3abiton 35 days ago [-]
I've been following nutrition "science" for the past 10 years, and to say it's cluster fudge is an understatement.
jmulho 35 days ago [-]
I recommend checking out Gill Carvalho (https://www.youtube.com/@NutritionMadeSimple). He helped me realize that nutrition science isn’t a controversial as it would seem from reading the popular press or the occasional study showing that bacon and Oreo cookies are good for your heart. It took five or ten videos to get a feel for how real scientists interpret new information. He explains the relative power of different types of scientific evidence, etc. Good stuff. He covers the Omega-3 AFib connection. If I remember correctly, Omegas-3s improve several cardiovascular risk factors, but also increase the risk of AFib. So, depending on your current situation, you may want to increase or decrease your intake. Deficiency is definitely bad, but you can also overdo it. I decided that sardines a few times a week is probably safer for me than the fish oil capsules I was taking daily.
pstuart 34 days ago [-]
He's on my list of "science advisors" as well (Dr. Patrick being the OG in this regard).
There are different variations of Omega 3 fatty acids. For instance, Avocados is rich in Omega 3 ALA which is considered not as effective as EPA and DHA.
>> Now, new research from the Intermountain Healthcare Heart Institute in Salt Lake City finds that higher EPA blood levels alone lowered the risk of major cardiac events and death in patients, while DHA blunted the cardiovascular benefits of EPA. Higher DHA levels at any level of EPA, worsened health outcomes.
>> [...] Based on these and other findings, we can still tell our patients to eat Omega-3 rich foods, but we should not be recommending them in pill form as supplements or even as combined (EPA + DHA) prescription products,” he said. “Our data adds further strength to the findings of the recent REDUCE-IT (2018) study that EPA-only prescription products reduce heart disease events.”
throwitawayfam 35 days ago [-]
> Fish is the only source of EPA and DHA.
Algae oil [0] which is plant based is also a source of EPA and DHA.
If you respond better to EPA (many do), you need fish (ideally Krill) oil.
dgemm 35 days ago [-]
EPA and DHA actually originate in algae and seaweed which is where the fish get it from, so those are good sources too.
mbil 35 days ago [-]
And algal oil supplements
butterlettuce 35 days ago [-]
I'm only going to bring up the life expectancy part, but latino people also live longer despite their cuisine not being the healthiest. I'm not saying that all latinos eat a terrible diet, but the cuisine we all know and love is high-carb and high in saturated fats compared to the olive oils, fishies, and veggies we see in the mediterranean diet.
Metabolic diseases are a different story. But I guess love and family cancel that out.
adolfojp 35 days ago [-]
Life expectancy in Latin America ranges from 65 in Bolivia to 80 in Chile and the cuisines, genetics, cultures, and socioeconomic circumstances vary greatly from region to region so it's not very useful to generalize latino people into one cohesive group with regards to diet and life expectancy.
thrawa8387336 34 days ago [-]
Bro don't watch TikTok, they eat way more vegetables and fruit on the daily than you can imagine.
I'm starting to wonder if Vitamin D and Omega 3s are indicators, not drivers. D is an indicator that you spend time outdoors, in the sun, and that is healthy for your body. Similarly, Omega 3 is indicative of other lifestyle choices, not causal for better health.
Enginerrrd 35 days ago [-]
Or even that being healthier and less frail means you're more likely to go out and enjoy being outdoors.
As I age, I increasingly see the effect that healthy people with great genetics also have all the indicators of being healthy. I think this effect is conflated to an extent even for things like exercise: for people that feel good and strong, exercise feels great. For people that aren't, they go downhill faster anyway.
I have terrible genetics for cardiovascular disease. I've spent my life as an athlete, eating healthy, training, etc. But now in my 30's, I can feel the slow down a lot despite being more disciplined in my training and diet than ever and yet I know people my age that haven't trained in years that can just go for a run and absolutely smoke me.
I'm sure at some point my genetics is going to force me to slow down a bit on the training despite my best efforts and then I'll just end up as someone contributing to the statistics that those who exercise more are healthier.
I know that exercise has benefits nevertheless, but I also think we very often just make the mistake of concluding "healthier people are healthier".
Life is not really fair.
kpfleger 34 days ago [-]
No, ample evidence shows that vitamin D (or vitamin D deficiency at least) is causally related to multiple diseases. The evidence is pretty overwhelming. Eg here's a just published review on D deficiency causality for Covid based on applying Hill's Criteria for causality https://www.mdpi.com/2072-6643/17/3/599 and a prior 2022 paper on the same subject https://pubmed.ncbi.nlm.nih.gov/35308241/
Some vitamin D skeptics claim tat there's insufficient evidence from RCTs but few people question the causality of smoking's influence on cancer despite no RCTs for that---that relationship was established also via Hill's Criteria.
eightysixfour 27 days ago [-]
> No, ample evidence shows that vitamin D (or vitamin D deficiency at least) is causally related to multiple diseases.
Both my statement and yours can be true. Having a deficiency in an essential nutrient can be causal for bad outcomes while, at the same time, having the correct amount or excess can be non-causal but correlated with positive health outcomes.
> I'm starting to wonder if Vitamin D and Omega 3s are indicators, not drivers
most cells have vitamin D receptors, so I would think it is actually a driver
kanbankaren 35 days ago [-]
> I'm starting to wonder if Vitamin D and Omega 3s are indicators, not drivers.
That is not true. AFAIK there have been several studies using supplements of Vitamin D3 & Omega-3 that showed that it improved biomarkers of various diseases.
Those are different claims. I don't exactly know what frailty means technically, but this was a 5 year study on the elderly. Preserving organ health with a lifetime of omega 3 consumption is totally different.
lmpdev 35 days ago [-]
As with almost everything in medicine, you can find papers both for and against
It doesn’t mean that either paper’s claims or results are automatically invalid
Instead, you should get your omega-3 from krill oil, which is low on the food chain does not concentrate Mercury is all around better
From: https://health.alaska.gov/dph/Epi/eph/Pages/fish/default.asp...
Almost as good as salmon re: Omega-3, but low mercury content.
To be fair, there’s low heavy metal contamination salmon on the market; a few sibling comments mentioned wild Alaskan salmon, but I also think farmed salmon tends to be lower in Hg content that the “average” wild salmon.
Also usually the smaller the animal / the farther down the food chain, the faster they reproduce. And some more reading of Wikipedia suggests that krill can reproduce very quickly.
I worked at a Norwegian company that ran 5 huge ships gulping krill 24/7 in the arctic region.
Once you see the scale of operation, it becomes pretty obvious it's a problem, and I'm pretty sure those numbers are manipulated to hide it.
> It is unclear how omega-3 fatty acids increase the AF risk. Omega-3 fatty acids stabilize the cardiac membrane and protect against arrhythmias, including ventricular arrhythmias, through both direct electrophysiologic actions and positive effects on biological processes involved in atrial remodeling. However, omega-3 fatty acids have direct effects on the activity of cardiac calcium, sodium, and potassium ionic currents, which can alter the duration of the ventricular action potential. Therefore, omega-3 fatty acids may promote re-entrant arrhythmias, despite being anti-arrhythmic in therapeutic conditions. Several previous studies have evaluated the electrical characteristics of the ventricular wall; few studies have evaluated how omega-3 fatty acids influence the atria.
There is no real reliable study's that show consistent benefits from Omega 3 supplements however.
With respect to vitamin D specifically, this isn't by itself good evidence vitamin D reverses aging. But it is consistent with the totality of evidence that being vitamin D deficient probably (causally) speeds aging. And it mildly increases the overall weight of evidence of a connection.
As with much vitamin D research, it would have been better for the intervention to have been titrate vitamin D supplement amount to achieve an optimal target range (eg 30-60ng/ml) rather than using a fixed relative moderate dose (2000IU).
The problem with a fixed dose is that surely some subjects started severely deficient, some mildly, and some had sufficient levels. The moderate but not very high fixed dose will have helped many in the middle group climb out of deficiency, not been enough for many in the 1st group to bring them fully out of deficiency, and been unnecessary for those in the 3rd group, so the study ends up seeing a weaker overall effect averaged over all subjects. This is well known within the vitamin D world, eg see https://x.com/KarlPfleger/status/1732514710715514883, but somehow has not permeated to be widely enough understood, even within the scientific community (or the Hacker News community).
For an extensive list of papers supporting a link between vitamin D and speed of aging, see https://x.com/KarlPfleger/status/1390717755158974464
Of course that doesn't necessarily mean it translates to extreme longevity.
Another that bridges the gap is https://www.youtube.com/physionic
Fish is the only source of EPA and DHA.
> Fish don't synthesize Omega PUFAs, they eat algae which synthesize fat-soluble DHA and EPA.
> From "Warning: Combination of Omega-3s in Popular Supplements May Blunt Heart Benefits" (2018) https://scitechdaily.com/warning-combination-of-omega-3s-in-... :
>> Now, new research from the Intermountain Healthcare Heart Institute in Salt Lake City finds that higher EPA blood levels alone lowered the risk of major cardiac events and death in patients, while DHA blunted the cardiovascular benefits of EPA. Higher DHA levels at any level of EPA, worsened health outcomes.
>> [...] Based on these and other findings, we can still tell our patients to eat Omega-3 rich foods, but we should not be recommending them in pill form as supplements or even as combined (EPA + DHA) prescription products,” he said. “Our data adds further strength to the findings of the recent REDUCE-IT (2018) study that EPA-only prescription products reduce heart disease events.”
Algae oil [0] which is plant based is also a source of EPA and DHA.
[0] https://en.wikipedia.org/wiki/Seaweed_oil
Metabolic diseases are a different story. But I guess love and family cancel that out.
"Vitamin D3 and omega-3 fatty acids not helpful in reducing risk of frailty" https://medicalxpress.com/news/2022-09-vitamin-d3-omega-fatt...
As I age, I increasingly see the effect that healthy people with great genetics also have all the indicators of being healthy. I think this effect is conflated to an extent even for things like exercise: for people that feel good and strong, exercise feels great. For people that aren't, they go downhill faster anyway.
I have terrible genetics for cardiovascular disease. I've spent my life as an athlete, eating healthy, training, etc. But now in my 30's, I can feel the slow down a lot despite being more disciplined in my training and diet than ever and yet I know people my age that haven't trained in years that can just go for a run and absolutely smoke me.
I'm sure at some point my genetics is going to force me to slow down a bit on the training despite my best efforts and then I'll just end up as someone contributing to the statistics that those who exercise more are healthier.
I know that exercise has benefits nevertheless, but I also think we very often just make the mistake of concluding "healthier people are healthier".
Life is not really fair.
Some vitamin D skeptics claim tat there's insufficient evidence from RCTs but few people question the causality of smoking's influence on cancer despite no RCTs for that---that relationship was established also via Hill's Criteria.
Both my statement and yours can be true. Having a deficiency in an essential nutrient can be causal for bad outcomes while, at the same time, having the correct amount or excess can be non-causal but correlated with positive health outcomes.
most cells have vitamin D receptors, so I would think it is actually a driver
That is not true. AFAIK there have been several studies using supplements of Vitamin D3 & Omega-3 that showed that it improved biomarkers of various diseases.
Similar significant results for symptoms of cystic fibrosis: https://pubmed.ncbi.nlm.nih.gov/32275788/
It doesn’t mean that either paper’s claims or results are automatically invalid
Research is hard