Vitamin D Decreases Inflammation

Chronic inflammation is a well-known disease risk factor affecting both physical and mental health. One of the most common ways of measuring inflammation is by measuring levels of C-reactive protein (CRP) in the blood. Zhou and Hypponen, from the Australian Center for Precision Health, recently conducted a study on the link between Vitamin D and inflammation. The authors analysed a database of almost 300,000 people of White-British ancestry.

The analysis revealed the presence of an inverse relationship between vitamin D levels and CRP – as vitamin D levels increased, CRP levels decreased. The relationship was only present at low levels of vitamin D. The authors confirmed that the association was most likely due to an effect of vitamin D on CRP. Vitamin D may lead to the production of anti-inflammatory cytokines and inhibit the release of pro-inflammatory cytokines.

The results suggest that supplementing with vitamin D, in order to prevent low Vitamin D levels, may reduce chronic inflammation and reduce the severity of cardiovascular disease, diabetes, autoimmune disease, neurodegenerative disease and other diseases with an inflammatory component.

Covid-19 Research Update

Gu et al. (Nature) recently published a paper explaining the association between Covid-19 and inflammatory and blood coagulation disorders involving platelets and endothelial cells. This is probably why patients with cardiovascular risk factors such as diabetes, obesity and ageing have been particularly vulnerable to Covid-19.

Malas et al. have published a meta-analysis of 42 studies (8271 patients) looking into the association between thromboembolism (blood clots) and Covid-19. The overall venous thromboembolism rate was 21%, deep vein thrombosis (DVT) rate was 20% and pulmonary embolism rate was 13%. There was a positive correlation between disease severity and risk of blood clotting. The risk of thrombosis can affect any organ in the body. This has led to guidelines recommending the use of anticoagulants for Covid-19 patients, especially when hospitalised.

A Chinese cohort study published in The Lancet followed 1733 patients after they were discharged from hospital. They found that at 6 months after onset of Covid-19 symptoms most patients still had at least one symptom. The most common persisting problems were: fatigue or muscle weakness (63%), sleep difficulties (26%) and anxiety and/or depression (23%). Those that had been more severely ill had a high risk of pulmonary diffusion abnormalities and abnormal chest imaging. Persistent kidney dysfunction, diabetes and blood clotting disorders were also observed.

Vagus Nerve Stimulation Reduces Rheumatoid Arthritis Symptoms

Genovese et al. recently presented the results of their research at the Annual European Congress of Rheumatology. They implanted mini neurostimulators in 14 rheumatoid arthritis (RA) patients that had failed to respond to anti-rheumatic medication. In the treatment groups, the vagus nerve was stimulated daily for 12 weeks. The results showed that stimulation of the vagus nerve reduced signs and symptoms of RA as well as decreasing by 30% the levels of cytokines (inflammatory mediators).

The vagus nerve is known to have anti-inflammatory effects and can also be stimulated by less invasive methods such as meditation, breathing exercises, relaxation techniques and acupuncture.

Bad Moods Can Increase Inflammation

Jennifer Graham-Engeland et al. from Pennsylvania State University have recently found a link between negative moods and inflammation. The main author stated that, “Because affect is modifiable, we are excited about these findings and hope that they will spur additional research to understand the connection between affect and inflammation, which in turn may promote novel psychosocial interventions that promote health broadly and help break a cycle that can lead to chronic inflammation, disability, and disease.”

Fibre Helps Treat Osteoarthritis By Decreasing Inflammation

It’s well-known that obesity can cause or exacerbate osteoarthritis (OA) through excessive mechanical loading. But another mechanism through which obesity can affect joint health is via inflammation and we now know that our gut microbes play a crucial role.

Recent research by Schott et al. has looked into the link between obesity, gut microbes and OA. They found a difference between the types of gut bacteria in obese mice compared to lean mice. The obese mice had more pro-inflammatory and fewer anti-inflammatory species than lean mice. The imbalance led to accelerated knee OA due to systemic inflammation and macrophage migration to the synovium. Interestingly, they found that oligofructose, a non-digestible prebiotic fibre, can help restore a normal lean gut microbiota in obese mice. The restoration of lean gut microbes was “associated with reduced inflammation in the colon, circulation and knee and protection from OA”.

Obviously one could wonder whether these findings apply to humans. About a year ago Dai et al. published the results of long-term studies on around 6000 people. Their findings consistently showed that higher total fibre intake was related to a lower risk of getting symptoms of knee OA!

Smoking Causes Inflammation

It’s been known for a while that smoking decreases blood flow and hence reduces the transport of oxygen and other nutrients to tissues. But recent research by Ava Hosseinzadeh et al from the University of Umea in Sweden has looked into its effects on inflammation. Their findings were published in the Journal of Leucocyte Biology. They found that nicotine induces neutrophils to release neutrophil extracellular traps (NETs). NETs surround and destroy microbial pathogens but they can also lead to excessive inflammation and tissue damage. Obviously, it’s the excessive inflammation and tissue damage that’s of concern and it provides yet another reason to stop smoking.

Sleep Deprivation Can Negatively Affect Cholesterol Levels And Inflammation

Vilma Aho et al from the University of Helsinki conducted 2 studies looking into the effects of sleep deprivation. The first study was experimental and consisted of partial sleep restriction to a small group of subjects. The second was an epidemiological study with over 2700 individuals. Blood samples were analysed in both cases.

The analyses revealed decreased circulating High Density Lipoproteins (HDL cholesterol), otherwise known as ‘good cholesterol’, and elevated inflammatory markers. Sleep loss decreased the expression of genes encoding cholesterol transporters and increased expression in pathways involved in inflammatory responses. The findings help to explain why sleep deprivation is a risk factor for cardiometabolic disease.

Tai Chi And CBT Decrease Inflammation

Poor sleep has been linked to increased inflammation. Inflammation is known to cause or exacerbate musculoskeletal disorders as well as more serious diseases such as heart disease, stroke and cancer. Irwin and his colleagues conducted a randomised controlled trial looking into the effects of cognitive behavioural therapy (CBT) and Tai Chi on the inflammatory markers of subjects with insomnia. The participants were offered 2 hour weekly sessions for 4 months.

CBT was found to reduce systemic inflammation whereas Tai Chi reduced cellular inflammatory responses. Both interventions reduced the expression of genes encoding proinflammatory mediators.

Meaning And Purpose Improve Health

Steven Cole et al. from UCLA have recently shown that having a deep sense of purpose and meaning in life can lead to positive genetic changes such as lowering the levels of inflammatory gene expression and strengthening the expression of antiviral and antibody genes. Theoretically, this could mean that those with a strong sense of purpose and meaning have a more efficient immune system and are less susceptible to inflammatory diseases.

Parallels can be drawn with Viktor Frankl’s influential book ‘Man’s Search For Meaning‘. In it, he relates his experiences of life in concentration camps during WWII. He believed that finding a meaning to life was crucial to survival in those terrible circumstances. After the war, he continued his work as a psychiatrist with logotherapy (a form of existential analysis) and became convinced that happiness was to be attained by finding meaning and purpose in life.

Dwelling On Stressful Events Can Increase Inflammation

A new study by Zoccola and colleagues found that people that were asked to dwell on a stressful event had higher levels of C-reactive protein (CRP). CRP is produced in the liver and its blood levels rise in response to inflammation e.g. infections, injuries, rheumatic or other inflammatory diseases, etc. Patients with high CRP concentrations are more likely to develop stroke, myocardial infarction and severe peripheral vascular disease.

The fact that rumination increases inflammation means that dwelling on negative thoughts has an adverse impact on pain and recovery from soft tissue injuries. Yet another brilliant example of the mind-body connection at work!