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CRP

A Link Between Inflammation and Body Weight (CRP)

Written by Biljana Novkovic, PhD on June 17th, 2020
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CRP levels increase with chronic inflammation. Chronic inflammation, in turn, may increase the risk of obesity. Read on to learn more about the CRP gene and weight.

What is CRP?

CRP, short for C-reactive protein, is an important part of the immune system. It’s mainly made in the liver and released into the blood in response to injury, inflammation, and infection [R].

It works as a pattern recognition protein, which means that its job is to recognize and bind invading microbes and damaged or altered (i.e. cancer) cells. In essence, CRP tags microbes and defective cells for destruction so they can be cleared away by white blood cells [R, R, R]. 

Once the cause of the disturbance has been taken care of, CRP levels usually drop back to normal. However, when there’s chronic low-grade inflammation in the body, CRP levels remain slightly increased [R].

Examples of chronic inflammatory states include: obesity, diabetes, gum disease, heart disease, autoimmune disease, depression, and cancer [R, R, R, R, R, R, R, R, R].

CRP’s main role is to tag microbes and damaged or altered cells for destruction. CRP levels increase in the short-term with injury, infection, and inflammation and decrease once the disturbance has been taken care of. CRP levels can remain slightly increased in those with chronic low-grade inflammation.

CRP Variants and Body Weight

Researchers have known for a while that obesity increases CRP. In fact, CRP is closely linked with BMI and total calorie intake [R, R]. But what about the other way around? Does higher CRP increase the risk of obesity? 

The ‘AA’ genotype of the rs1130864 SNP in the CRP gene has been linked to obesity and higher BMI in over 400 adults [R].

In addition, in a study of over 800 schoolchildren, boys who had the ‘CC’ genotype for another CRP SNP — rs1205 were heavier, had a greater waist circumference, and a higher BMI and body fat percentage. However, this didn’t apply to girls [R]. 

rs1205 also wasn’t linked to obesity in a study with over 2.2 older adults [R].

Two SNPs in CRP have been linked to obesity, one in adults and another one in schoolboys, but not schoolgirls or older adults.

Possible Mechanism

The ‘CC’ genotype of rs1205 SNP and ‘AA’ genotype of rs1130864 are associated with higher CRP levels, which means more inflammation in the body [R, R].

This may be bad because research suggests that, apart from being a marker of inflammation, CRP also creates more inflammation on its own by [R]:

  • Increasing the release of proinflammatory cytokines from white blood cells
  • Increasing the release of inflammatory molecules in blood vessel walls
  • Preventing blood sugar from entering into the muscle tissues and thereby increasing insulin resistance and insulin levels

Insulin resistance and higher insulin, in turn, may cause obesity.

When people (diabetics) and animals are given insulin, they gain weight and body fat [R, R].

In addition, certain populations that have higher baseline insulin levels, such as Pima Indians, are also more prone to obesity [R].

Variants associated with higher CRP levels may increase inflammation and insulin resistance  in the body. Insulin resistance, in turn, may increase the risk of obesity.

Your CRP Results for Obesity

SNP Table

variant genotype frequency risk allele
rs1205
rs1130864

 

CRP rs1205:

  • ‘CC’ = higher CRP levels, associated with childhood obesity in boys
  • ‘CT’ = lower CRP levels, not associated with obesity 
  • ‘TT’ = lower CRP levels, not associated with obesity 

Around 46% of people around the world carry the ‘CC’ genotype.

CRP rs1130864:

  • ‘AA’ = higher CRP levels, associated with obesity in adults
  • ‘AG’ = lower CRP levels, not associated with obesity 
  • ‘GG’ = lower CRP levels, not associated with obesity 

Only about 5% of people carry the ‘AA’ genotype. This genotype is more common in Europeans where almost 11% of people have it.

 

Recommendations

Lifestyle

Address Any Underlying Health Conditions

If your CRP is already higher at baseline, you definitely want to avoid or improve conditions that would elevate it further. Work with your doctor to address any underlying conditions that are potentially increasing your CRP. 

Exercise

Regular physical activity can help decrease CRP levels over time [R, R].

Good news is that the amount of exercise needed to lower CRP levels is relatively modest. Scientists have made an estimate that the total energy expenditure needed was around 368 – 1,050 calories/week [R].

A big plus — high-intensity exercise is probably the best strategy to lose weight. In addition to promoting fat and calorie burning, it may increase the levels of chemicals that support mental health and suppress appetite such as the neurotransmitters norepinephrine and endorphins, and the neurotrophin BDNF [R, R, R].

Aerobic exercise (like walking, running, swimming, etc) also lead to major reductions in belly fat in multiple studies. Although the reason is not fully understood, yoga can be a useful tool for weight loss too [R, R, R, R, R].

Stress Reduction

Both psychological and social stress can increase CRP [R, R, R].

A study suggests that adolescents who engage and work on resolving their issues (e.g. conflicts with parents, siblings, friends) and thereby decrease stress in their lives also have lower CRP levels [R].

Stress is a well-known obesity contributing factor. It increases cortisol and dynorphin, both of which cause weight gain [R, R, R].

It also increases glutamate, which increases appetite, while decreases NGF and BDNF, both of which are appetite suppressants [R].

Additionally, stress makes the brain resistant to serotonin and dopamine, which may increase appetite and block the rewarding effects of food [R, R, R].

Regular exercise decreases CRP levels over time, while stress increases them. Reduce stress in your day-to-day life, increase physical activity, and work with a doctor to address any existing inflammatory conditions.

Diet

Fruits & Vegetables

Healthier meals and diets, rich in fiber, fruits, and vegetables, have been independently associated with lower CRP levels [R, R].

On the other hand, diets high in fat, sugar, and refined grains can increase CRP [R].

The Mediterranean diet is rich in fruits and vegetables, while it limits the foods that may hinder weight loss, such as sweets and refined grains. Studies have confirmed its potential to reduce inflammation and improve metabolic health [R, R, R, R].

In a meta-analysis of 16 trials with over 3.4k participants, Mediterranean diet improved body weight and BMI. It was especially beneficial when combined with calorie restriction, exercise, or when it lasted for more than 6 months [R].

Fiber

High dietary fiber intake has been associated with lower CRP levels [R, R].

Currently, in the US, the average fiber intake is around 15 g/day which is half of the recommended amount [R].

Fiber, both from foods and supplements, is known to increase satiety after a meal and decreases subsequent hunger. Studies suggest that an additional 14 g of fiber per day is associated with a 10% lower energy intake and weight loss [R].

In a meta-analysis of 62 trials with over 3.8k people, soluble fiber modestly but significantly improved body weight and decreased waist circumference even without calorie restriction [R].

Diets rich in fruits, vegetables, and fiber decrease CRP levels and improve weight loss.

Coffee

Research suggests that there’s a link between higher coffee consumption and lower CRP [R, R, R, R].

In multiple smaller clinical trials, caffeine (100-600 mg/day) increased energy use and fat burning. It also helped maintain weight loss in two long-term studies with 2,500 participants [R, R, R, R, R, R].

However, consume coffee in moderation. Remember that a high intake of caffeine can cause adverse effects such as insomnia, anxiety, increased heart rate and blood pressure, increased urination, and muscle twitching [R].

Green Tea

Studies have found that green tea reduces inflammatory biomarkers including CRP [R, R, R].

EGCG caused between 0.2 and 3.5 kg of weight loss in limited human studies. Green tea, meanwhile, is hypothesized to make us burn more calories, even at rest. In most studies, this amounts to a modest 3-4% increase in energy, though some studies have shown an increase as high as 8%. For a 2,000 calorie diet, 3-4% amounts to an additional 60-80 calories per day [R, R, R, R, R, R].

Cocoa and Dark Chocolate

Good news for chocolate lovers — several studies found that cocoa and dark chocolate can help decrease CRP levels [R, R, R, R].

Cocoa contains polyphenols that are believed to promote weight loss, though clinical studies are few and far between. In one study, daily consumption of 49 grams of dark chocolate reduced the quantity of snacks eaten by adults, suggesting that cocoa might decrease appetite or cravings [R].

In mice, cocoa consumption reduced weight gain and fat uptake in the gut. Cocoa also reduced inflammation associated with obesity and improved insulin resistance [R].

Coffee, green tea, cocoa, and dark chocolate have all been associated with lower CRP levels and modest to significant weight loss.


 

Author photo
Biljana Novkovic
PhD

Biljana received her PhD in Ecological Genetics from Hokkaido University.

Before joining SelfHacked, she was a research scientist with extensive field and laboratory experience. She spent 4 years reviewing the scientific literature on supplements, lab tests and other areas of health sciences. She is passionate about releasing the most accurate science & health information available on topics, and she's meticulous when writing and reviewing articles to make sure the science is sound. She believes that SelfHacked has the best science that is also layperson-friendly on the web.

Disclaimer

The information on this website has not been evaluated by the Food & Drug Administration or any other official medical body. This information is presented for educational purposes only, and may not be used to diagnose or treat any illness or disease.

Also keep in mind that the “Risk Score” presented in this post is based only on a select number of SNPs, and therefore only represents a small portion of your total risk as an individual. Furthermore, these analyses are based primarily on associational studies, which do not necessarily imply causation. Finally, many other (non-genetic) factors can also play a significant role in the development of a disease or health condition — therefore, carrying any of the risk-associated genotypes discussed in this post does not necessarily mean you are at increased risk of developing a major health condition.

Always consult your doctor before acting on any information or recommendations discussed in this post — especially if you are pregnant, nursing, taking medication, or have been officially diagnosed with a medical condition.

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