Brian Lawlor32:19
That's a fact. Now, light smoking. What's light smoking? I mean, but I think light smoking is apparently 10 to 20 cigarettes a day. I don't think that's light smoking, but there you go. This is serious, isn't it? How come we don't have a public health campaign around loneliness and health in Ireland? Yeah, we have public health around hypertension and obesity, right? And cigarette smoking. So these are all the bad things associated with being lonely, isolated, increased risk of dying. I showed you that before. Being more frail, heart attack, stroke, sleep problems, increased risk of dementia, increased risk of psychosis, and very much depression. Depression is very much a, loneliness is very much a risk factor for depression. So, what does it do to your physiology? If you are lonely, particularly emotionally lonely on a long-term basis, your blood pressure goes up, your sleep gets fragmented, and these inflammatory markers in your system, in your blood, they go up and not good to have high levels of inflammatory markers because they can aggravate heart disease and other bad things. You also, your stress axis is overactive. So your cortisol level goes up. All these are not good things for loneliness, particularly loneliness and isolation. So what about the brain? Loneliness in the brain, it affects your cognition but also over time, over time we know that loneliness is a risk factor for the development of dementia. It's also associated with depression, psychosis and lack of compassion and empathy. These are very important. So when people are lonely and it's not something that you should blame a person if they're lonely because it's not their fault but also if they're lonely their empathy and compassion levels go down. So it's harder for them to feel compassionate, to feel empathy because of the loneliness. And this brings us to the important point about brain health, you know, and again loneliness and social isolation do impact on your brain health and on your mental health. And really what we should be trying to do with brain health is protecting the brain, reducing risk of the brain. I'll talk about the different risk factors in a moment and building reserve in the brain. And what loneliness and isolation do is they diminish our reserve in our brain so that as we get older we don't have the same ability to counter, you know, pathology, the wear and tear that happens in our brains as we get older. So this is why we think people are at greater risk of developing dementia due to social isolation. They have diminished reserve, cognitive or brain reserve. So we know that if you take a mouse and you isolate the mouse, now mice are, you know, you say, how would you know a mouse is lonely? That's not an easy question. Who wants to try that one? Mice are very social. I mean, I don't know who, well, I hope you don't have mice in your house and we don't have mice here in Unit 18. But they are quite social, but it's hard to tell if a mouse is lonely. But you can isolate a mouse. But what happens to a mouse's brain if you isolate it? Basically, you get, there's a kind of a trophic factor, like a brain fertilizer goes down in the brain when you isolate the mouse. The cortisol level goes up. You've heard about cortisol and loneliness as well. And so it happens in the mouse as well. And also this is what's shown here. The number of nerve cells in a particular part of the brain, the hippocampus, which deals with memory, goes down. So this is what happens in mice, not necessarily men, but it's probably what happens in men. Let me tell you about these Antarctic expeditioners because this is a way we can study what happens to the brains of people when you isolate them and they become lonely. So these were studies done with Antarctic expeditioners. Okay. So they have to go down to the Antarctic and they're in this station and they're pretty much isolated and it's a lonely place to be and they're there for months and months on end. So what they did with these people was they looked at their brains before they went down. So they did a scan, an MRI scan, but then they also measured the brain fertilizer level, BDNF in them, right? And lo and behold, when they compared, you know, the brain size and the BDNF, the brain fertilizer levels before and during and after, what happened was, not surprisingly, when these people were isolated and became lonely, the brain volume decreased, the brain size decreased, and this brain fertilizer level went down just like what happens in the mouse. So, these are real effects. Isolation and loneliness can affect the brain structure and the function over time.
Okay. So I just want to talk a little bit more about loneliness and depression because I always go back to that patient I had, the widow. This was data from St. James's around the catchment area. And what we found was that again this is very important about loneliness being a risk factor for depression that as the level of loneliness goes up, these are older people over the age of 65, the prevalence of depression went right up, shot up as well. Okay, very high levels of depression when there was very high levels of loneliness. And what we're showing here between the red and the blue is that if you have a good network, it did buffer it a little bit. It dropped it down. So it's good to have a social network. Even if you are lonely, but loneliness does increase the risk of developing depression. It also, loneliness predicts hopelessness which is not a good thing because people feel they feel hopeless. They despair and is a risk for suicide. But very interestingly what we found was that depression in widowhood was linked to a higher prevalence of loneliness. So just like the widow I described to you, that you're more likely to get depressed if you lose somebody that you love if you're lonely. That's why it's so important to tackle the loneliness and maybe let us think about maybe there's a way if you could, you might be able to prevent depression related to bereavement if you address loneliness. So these are things to think about and I think that one of the discussions I would have had with that patient was, you know, the talks about, you know, obviously when you are in relationships and in community it's good to diversify, it's good to have lots of different connections, do different things, have different interests, not put all your eggs in one basket as it were because that could be a helpful preventive. It's just good advice for everybody. Psychosis and loneliness. I mean, I mentioned to you about mistrust and hypervigilance being part of loneliness. And this relationship probably goes both ways. That people who have psychotic illness are more likely to be lonely. But also if you have loneliness, you may be more likely to develop a psychotic illness. And we know that from experiments. If you take people like ourselves, you know, you can experimentally change the level of mistrust, you know, you can do this in a room. But if you reduce, you can reduce loneliness by decreasing these paranoid feelings, you know, in people. So there does seem to be this relationship. And I do believe that maybe if at a community level and a population level, if we were able to address loneliness, we might be able to decrease the risk of people becoming or developing psychotic illness. And community and connection can be very very important and maybe actually be able to prevent mental illness like depression or psychosis. I mentioned to you that you know people who are lonely have reduced empathy and reduced compassion and this is very difficult for people when they feel lonely and this is why it's important to address loneliness because lack of empathy, lack of compassion, it interferes with relationships. And I did, I mentioned to you about the risk of developing dementia from loneliness but also if people who are lonely it does affect their cognition, their processing speed, how fast they think, how quickly they think, how accurately they think. And also in older people, you know, people who are lonely versus those who are not. If you're lonely, the cognitive decline can be more rapid. The other point I want to make about loneliness though is that sometimes older people, particularly over the age of 80, if they develop loneliness, it's possible that there could be some memory or cognitive changes happening as well. So you know, it's...
People who develop dementia can be lonely and isolated. It can be a stigmatizing illness, and loneliness is associated with the development of dementia, but also sometimes the actual underlying dementia process may be causing some of the loneliness, particularly in people over the age of 80. So it's an interesting and important relationship.
But very importantly, and we do believe this in the Global Brain Health Institute, that social engagement, the sorts of things we're doing today, is a modifiable risk factor for dementia. So there are things we can do to prevent dementia, to prevent cognitive decline. This is one of them: community connection. And it's a very, very important one to start early and to keep up.
I mentioned about COVID-19, which is kind of a horrible natural experiment in social isolation. What happens when you restrict people? It really caused a huge amount of anxiety, depression, and distress. But in terms of loneliness, this is what happened in Ireland. I'm not sure whether you've seen these data before, but in 2018, before COVID, how many people said that they were lonely almost or all or most of the time? This is census data: about 4%. Right? Look what happened then. April 2020, do you remember back to April 2020? It was just sort of really, you know, St. Patrick's Day, they were just sort of heading into it: 7%. By November, 14%. So it just shows you what isolation restrictions can do.
This is again 2018 and then November 2020. But I just want to show you again where the biggest jump in loneliness was during COVID and who was most affected. Who would you have predicted?