HIV Foundation Health The big meat check: how much you can eat and how you can prepare it healthily

The big meat check: how much you can eat and how you can prepare it healthily

Givers of strength with essential vitamins and protein or cholesterol bombs loaded with antibiotics – the subject of meat is hotly debated. FOCUS Online names the most important facts about the individual types of meat – and shows what “healthy” fat traps are.

The hunger for meat in Germany is great. Every inhabitant eats around 60 kilograms per year. Around 750 million animals are therefore slaughtered every year. Meat consumption has been falling for years, but only in the single-digit range. However, statistically speaking, every citizen still consumes around 1,100 animals in his life, including mainly chickens, but also just under 50 pigs and four cattle, as the BUND’s last meat atlas in 2018 calculated.

Meat causes a lot of CO 2 , but provides the best protein

Meat is thus undoubtedly one of the staple foods. However, it is left out of the picture that meat consumption is devastating for the climate balance: Through animal production, a meat eater pollutes the atmosphere with a good 1,800 kilograms of CO 2 per year and thus heats the climate catastrophe, vegetarians only make up about half of this.

Aside from that: nutritionally, meat offers a lot of positives. “Meat is definitely a high-quality food because it provides us with protein in particularly good bioavailability,” says Antje Gahl, press spokeswoman for the German Nutrition Society ( DGE ).

Animal protein, i.e. from meat and dairy products, can be used so well by our body because the composition of the amino acids is very similar to that of human protein. Animal protein usually contains all of the essential amino acids that we need in sufficient quantities, while plant-based foods often do not have the full spectrum of these amino acids. The body can therefore produce protein particularly quickly and appropriately from animal protein – for the muscles, for example.

In addition, meat is also characterized by other valuable ingredients:

  • readily available iron,

  • Selenium and

  • zinc

– all minerals and trace elements that are indispensable for blood formation, immune system, cell health, fertility and much more. Another unique feature is the high proportion of B vitamins, including vitamin B12 , which is only found in sufficient quantities in animal foods such as meat, eggs, milk and dairy products.

Preserving nutrients through proper cooking

To ensure that these nutrients are preserved as well as possible during preparation, the expert recommends steaming and slow frying, preferably with little fat. Some B vitamins are sensitive to heat, such as vitamins B1, B2 and B6 – vitamin B12 a little less.

The way in which meat and meat products are prepared determines how many vitamins are destroyed and how undesirable pollutants are formed. Therefore, everyone should consciously pay attention to high temperatures such as when grilling or the duration of heating. The longer and hotter it is cooked, the more pollutants are created or parts of the valuable B vitamins are destroyed.

Nevertheless, barbecuing is particularly popular . An important tip from the expert for grilling: “Dab the marinade before you put the meat on the grill.” Otherwise it will drip into the embers, burn and, among other things, produce polycyclic aromatic hydrocarbons. PAHs are strongly suspected of increasing the risk of cancer.

Meat is healthy when prepared correctly. But is it also an indispensable food? “No”, says the qualified ecotrophologist. Apart from vitamin B12, which is also contained in milk and dairy products, each of these nutrients can be obtained from plant-based foods – even if not in the ideal composition and high quality that is given with meat.

The “dark side” of meat: cholesterol, purine and arachidonic acid

However, meat is also the main source of cholesterol. In high amounts, cholesterol is a risk factor for arteriosclerosis and thus heart attack and stroke. It is not only present in the visible fat in the meat, but also in low-fat pieces. 100 grams of lean meat provide around 50 milligrams of cholesterol per 100 grams. 300 milligrams per day is the maximum limit for the intake of cholesterol per day for healthy people, i.e. without a lipid metabolism disorder.

In addition, meat, especially offal, contains purine, i.e. uric acid, which supports gout. Arachidonic acid plays a role as the third negative, natural ingredient in meat. The body creates inflammatory substances from this fatty acid. Diet suggestions for diseases with an inflammatory character such as rheumatism are therefore always meat-free or strictly reduced in meat.

“The majority of the amount of cholesterol and purine ingested with food actually comes from meat and meat products such as sausage and ham, a particularly large proportion of which have offal,” confirms the scientist. Nevertheless, cholesterol is an indispensable substance in the body because it takes on important tasks in building cells and nerves. “But our body also produces cholesterol itself and is therefore not dependent on the intake with food,” she explains. Anyone who then eats a lot of meat and sausage quickly absorbs high amounts of cholesterol.

Red meat vs. White meat

However, not all meat is created equal . When it comes to health, a distinction is made between red and white meat. Red meat, i.e. beef, pork, lamb, sheep and goat, is considered particularly unhealthy because it is said to favor diseases.

“Anyone who eats a lot of red meat and especially processed red meat has a higher risk of colon cancer, as many studies indicate, according to the current state of knowledge, consumption of white meat (poultry) is not related to cancer,” says the qualified ecotrophologist. Overall, however, the quality, quantity and method of preparation of the meat are decisive in contributing to a healthy diet.

Pork is leaner, chicken is fatter than expected

But the animal from which the meat comes also plays an important role. How about pork, the most popular meat in Germany and the other types of meat consumed in this country?

pig

Depending on the fat content, pork provides between 100 and 250 kilocalories per 100 grams, 70 milligrams of cholesterol. It also has a high content of vitamins B1 and B6.

So pork is surprisingly low in calories, but provides more cholesterol than, for example, beef. “Reach less for high-fat parts,” advises Antje Gahl, “but because of its vitamin B1 and B6, zinc and iron content, pork can make a contribution to a wholesome diet.”

Pork is popular because of its fine taste and can be used in many ways, quickly prepared and is particularly suitable as pan-fried meat (schnitzel) or roast with a crispy rind.

Beef

In terms of calorie content, beef is comparable to pork, depending on the fat, has around 150 to 200 kilocalories per 100 grams and 50 milligrams of cholesterol. It scores with high levels of vitamin B12, zinc and iron.

The strong taste of beef is particularly appreciated by many meat eaters. Because of its long fibers, beef lean meat must be specially prepared; apart from the fillet pieces, it requires a longer cooking time.

poultry

White, tender meat and a nutty taste are the characteristics of chicken, duck, turkey and goose. Because of the layer of fat under the skin, poultry meat provides a relatively large number of calories, around 270 kilocalories per 100 grams. If you choose a skin-free steak, you only get around 160 kilocalories. The fat content is around 25 grams per 100 grams of poultry meat.

In addition, poultry meat is particularly rich in protein, so it provides a lot of energy. Zinc, potassium and B vitamins make poultry meat particularly healthy.

But be careful, the crispy skin of chicken and duck contains lots of purines, so it can increase the risk of gout. This is particularly relevant for those who already have elevated purine levels, warns the expert. However, poultry is safe for healthy people in this context.

But: “Poultry meat contains significantly more cholesterol than is generally assumed, namely around 90 milligrams per 100 grams,” she adds. Chicken may be low in fat, but that doesn’t mean it’s low in cholesterol, as is often assumed.

lamb

The tender, dark meat with its strong taste is not one of the Germans’ favorite varieties. However, it contains many B vitamins as well as iron and has a high proportion of valuable protein. What is surprising, however, is that on average lamb provides more calories than pork, almost 200 kilocalories per 100 grams of fresh meat, as well as 70 milligrams of cholesterol and many saturated (unfavorable) fatty acids.

Particular attention should be paid to the fatty acid composition with many saturated fatty acids in lamb. Like chicken, lamb is not fundamentally unproblematic when it comes to fat – as is often assumed.

Wild

It looks different with game meat. Saddle of venison, venison ragout, roast venison and wild boar are rarely served in Germany, although the meat is actually very low in fat, rich in protein and rich in vitamins B1 and B2, potassium, magnesium, iron, zinc and selenium – and therefore healthy. Depending on the variety, it provides only 100 to 160 kilocalories per 100 grams of fresh produce, with less than ten grams of fat, around 60 milligrams of cholesterol and hardly any purine.

However, game meat should only be enjoyed well cooked because it can contain parasites, as the Federal Institute for Risk Assessment ( BfR ) warns. The radiation exposure of venison can also be high, depending on the region. “In wild boars, values ​​are still occasionally measured today that exceed the limit value for marketing 600 Becquerel per kilogram by more than ten times,” reports the Federal Office for Radiation Protection BfS .

horse

Horse meat is also controversial, although it is very healthy with a high content of minerals, vitamins and protein, but low in fat (around two grams per 100 grams of meat) and low in cholesterol. Here there are more psychological reasons why the meat of the popular sport animals is frowned upon, in contrast to France , where it is coveted as a delicacy.

You can eat that much meat

Meat is therefore quite healthy. “Nobody has to go without meat in principle, because it is a valuable part of our diet,” says the expert. However, it depends on the amount, and the following applies: less is more.

The DGE recommends that people who eat meat do not consume more than 300 to 600 grams of meat and meat products per week. That goes for adults. So it’s practical: eat meatless for a few days, then a meat dish. A portion of meat can weigh 100 to 150 grams, a slice of cold cuts 15 to 25 grams, depending on the type.

“Meat makes perfect sense in a wholesome diet, because it covers the need for many important nutrients with a single food. Even these small amounts are sufficient for this. It is best to choose predominantly plant-based foods and supplement them with animal-based foods, ”emphasizes Antje Gahl.

Of course, that doesn’t mean everyone has to eat meat. Those who prefer a vegetarian diet can supply these nutrients through a targeted selection of different types of vegetables and fruits, whole grain products, legumes, nuts and dairy products.

Organic meat or meat from conventional farming

Meat consumption in moderation is therefore quite healthy. It is not necessary to weigh one type of meat against another. Variety as well as personal preferences, taste and last but not least religion are important, emphasizes the qualified ecotrophologist. For more and more people, the ecological balance of rearing and animal welfare also play a role, keyword antibiotics, but also manure pollution and thus nitrate in the groundwater.

In organic animal husbandry, even fewer antibiotics may be used than in conventional farming, although there has also been a reduction recently. It is different with manure, whether organic or bulk, every animal produces just as much of it.

The best advice: eat less animal foods and more plant-based ones. In this way, fewer resources are used, the environment is less polluted and CO 2 emissions would be significantly reduced. Because meat production in particular produces a lot of the climate gas methane, which is many times more harmful to the climate than CO 2 .

Halve meat consumption

But as mentioned at the beginning: With 60 kilograms of meat consumed per person per year, Germany is far from the moderate recommendations of the DGE, which make up at most half of this amount. Accordingly, healthy meat consumption should hardly exceed around 30 kilograms per year – for the benefit of health, animals and the environment.

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The unknown colon cancer: How to prevent tumors in the small intestineThe unknown colon cancer: How to prevent tumors in the small intestine

When it comes to colon cancer, most people think of colon cancer. What is less well known is that the small intestine can also develop malignant tumors. What you should know about it, about symptoms, treatment and the combination of colon and small bowel cancer.

Small bowel cancer accounts for up to five percent of all bowel cancers; around 2,600 men and women were diagnosed with small bowel cancer in 2016, compared with around 60,000 colon cancer. “It is important to classify a carcinoma on the one hand by localization, i.e. in the case of bowel cancer, small or colon cancer, but also differentiate it on the basis of its biological characteristics,” reports Ulrich Graeven, chief physician at the Clinic for Hematology, Oncology and Gastroenterology at Maria Hilf Mönchengladbach Hospital.

Cancer of the small intestine is usually biologically very different from cancer of the colon

While colon cancer is usually adeno tumors, i.e. growths of the mucous membrane, this affects only a small fraction of small bowel cancer. The most common forms of small bowel cancer, depending on the cells that cause the disease, are:

  • Neuroendocrine tumors (NET) with around 50 percent, they arise from hormone-producing cells
  • Gastrointestinal stromal tumors (GIST) make up about ten percent, these tumors originate from the connective tissue in the gastrointestinal tract.

The differing biological characteristics of the two types of colon cancer, colon and small bowel cancer, “make these two diseases so fundamentally different, even though both affect the bowel,” explains the oncologist.

Causes of small bowel cancer and why it is less common than colon cancer

What triggers the fact that the cells in the small intestine no longer act normally, but degenerate and multiply in an uncontrolled manner, is still largely unknown. It is assumed that there is a connection with pollutants in food that come into contact with the small intestine during passage and can thus influence its cells.

It is well known that the small intestine connects directly to the stomach. This first section of the three-part small intestine is called the duodenum, followed by the jejunum and ileum. In addition to transporting the chyme to the large intestine, the task of the five-meter-long small intestine is to break down certain food components and release them into the blood. The most important ones are carbohydrates, which are processed into various sugars, fat, but also vitamins and trace elements.

The chyme is still thin in this section of the intestine and is therefore transported on quickly. The contact time with the intestinal wall is much shorter than later in the large intestine, “which could explain why colon cancer is much more common than small intestine cancer,” the gastroenterologist explains the possible background. In addition, the mucous membrane in the small intestine is less susceptible to certain factors such as pollutants than that in the large intestine.

Risk factor hereditary diseases

However, there is also a familial willingness to develop small bowel cancer: Hereditary polyposis syndromes such as familial adenomatous polyposis (FAP) and Lynch syndrome. Genetically, a large number of polyps develop in the large intestine, sometimes also in the small intestine. These are adenocarcinomas, but are very rare in the small intestine compared to NET and GIST.

Small intestinal tumors associated with FAP are usually only discovered when polyps have been detected in the large intestine. In the course of further diagnosis of the familial predisposition, these rare small bowel carcinomas are also identified.

Small bowel cancer symptoms

Small bowel cancer usually grows slowly. Frequently, signs only appear when the disease has progressed and the tumor is taking up space. Depending on you can

  • Bleeding,
  • Stomach pain,
  • nausea
  • Constipation or diarrhea

occur. If the tumor is large, it can even block the intestines (ileus). The intestinal obstruction manifests itself through massive pain, it is always a medical emergency that is life-threatening and must be treated immediately.

Small bowel cancer prognosis varies

Small bowel cancer is usually only discovered at an advanced stage. In more than 70 percent, the carcinoma is only diagnosed in stage three or four, i.e. later than this applies to this common colon cancer – again the comparison with colon cancer.

The survival rates for small bowel cancer are therefore somewhat lower. “The decisive factor, however, is always the type of cancer of the small intestine,” explains the expert. If a GIST or NET is detected early, the chances of survival are very good. If, on the other hand, it is adenocarcinoma, which is also usually discovered later, the prognosis is not quite as favorable.

Diagnosis of small bowel cancer

The classic examination methods of gastroscopy and colonoscopy only cover the upper or lower part of the small intestine, “the almost five meters in between are not reached with these examination techniques,” explains the expert.

Imaging methods such as magnetic resonance tomography (MRT) or computed tomography (CT) are only used if there are symptoms and suspicion of this intestinal tumor. Capsule endoscopy, which shows images from the small intestine, also provides information.

Only when these examinations reveal an abnormality is it possible to specifically mirror the small intestine. “However, this is very time-consuming and cannot be used as a preventive examination – also because these intestinal tumors are very rare,” emphasizes Ulrich Graeven.

Small intestinal cancer therapies – surgery and its consequences

Overall, the following applies to the various small intestinal tumors: If possible, an operation should be performed. “If the tumor is limited, parts of the small intestine can usually be removed without any problems,” explains the oncologist in more detail.

A stoma, i.e. an artificial anus, is therefore usually not necessary. However, it is crucial which part of the small intestine is missing and which functions it had, which trace elements and vitamins it passed on to the body. This deficiency must then be compensated for through appropriate nutrition or medication.

Treatment for small bowel cancer varies depending on the type of tumor

Parts of the removed tumor are examined histologically. For the therapy plan, it is crucial whether it is NET, GIST or the rare familial adenocarcinoma in the small intestine. “A generally applicable therapy scheme for small bowel cancer is not possible because there is not just one small bowel cancer, but different ones, it always depends on its type,” emphasizes the oncologist.

Accordingly, there are many different therapy options. If a gastrointestinal stromal tumor (GIST) has metastasized, for example, there are very good drugs for further treatment. “This is not the classic chemotherapy, but we use so-called tyrosine kinase inhibitors, with very good results,” reports the expert. These are inhibitors, such as imitanib, that can block certain signaling pathways within the cells. They are sometimes also used before an operation to reduce the size of a tumor that is too large and therefore inoperable, or after an operation to avoid a relapse.

If the cancer of the small intestine is a neuroendocrine tumor (NET), on the other hand, surgery is often the only treatment required. The NET is further subdivided with regard to the need for drug therapy, taking into account its growth rate. This subdivision of the NET is also of crucial importance for planning therapy for metastatic NET.

Ademocarcinoma of the small intestine is treated on the basis of the results from the treatment of colon tumors.

Small bowel cancer prevention

Targeted prevention against these rare tumors is hardly possible – apart from the well-known rules for a healthy life, i.e. without smoking, with a sensible diet, extensive alcohol restriction and sufficient exercise. Because little is known about the possible causes of small bowel cancer, they cannot be influenced.

However, there is an important tip from the expert for everyone in whose families there are genetically determined polyps in the large intestine: Remember to not only limit the preventive measures to the large intestine, but also to extend it to the small intestine. Although this is provided for in the relevant colorectal cancer screening and follow-up programs, it must not be overlooked.

Find Out How to Take Control of Your Health!Find Out How to Take Control of Your Health!

Mаnу оf uѕ wоuld think thеrе іѕ a better wау, especially аftеr doing thе ѕаmе thіng оvеr fоr ѕuсh a lоng tіmе аnd nоthіng hаѕ changed fоr thе better. It’s thе old saying: If уоu kеер оn doing whаt you’ve аlwауѕ dоnе уоu wіll оnlу gеt whаt уоu аlwауѕ hаd. Nоthіng lеѕѕ, nоthіng mоrе аnd thе ѕаmе applies tо оur health. Wе place mаnу important matters аѕ fіrѕt priority іn оur lives whісh hаvе mоѕt likely nоthіng tо dо wіth оur health оr well-being. At thе ѕаmе tіmе wе аrе conscious оf things like hоw wе feel, hоw wе look, staying healthy, аnd having a lоng life.

Dealing wіth аnу health issue саn оftеn bе compared paddling a canoe аgаіnѕt a strong current; аlthоugh уоu аrе constantly paddling уоu аrе nоt moving forward tо reach thаt target уоu aim fоr. Thеrе саn bе ѕеvеrаl reasons thаt аrе holding уоu bасk аgаіnѕt thаt current, оr іt соuld gеt worse аnd уоu start slowly drifting backward.

Thіѕ оnе іѕ totally оut оf control!

Obesity: Whу obesity уоu mау say? Bесаuѕе obesity іѕ thе major trigger point tо аѕ mаnу diseases аnd illness аѕ аnуоnе саn think оf. Thіѕ іѕ nо longer just affecting people іn thе richer countries. Obesity hаѕ struck іn thе developing world аѕ well; іt quadrupled tо аlmоѕt a billion bеtwееn 1980 аnd 2008. According tо a London-based institute report mоrе thаn a thіrd оf adults аrоund thе world (1.46 billion people) wеrе obese оr overweight. Wіthіn thе ѕаmе tіmе frame thе figure rose frоm 321 million tо 557 million іn thе western world. Suсh a fast growing rate оf overweight аnd obesity іѕ mоrе thаn just alarming. Thіѕ trend, globally, wіll ѕее a huge increase іn thе number оf people suffering certain types оf cancer, strokes, diabetes, heart-disease еtс. Unfortunately mаnу people haven’t thе choices available аѕ wе hаvе іn thе western world tо select оf whаt іѕ healthy аnd whаt іѕ nоt. Thіѕ іѕ thе point whеrе taking control оf уоur health muѕt begin!

Choose wіth уоur brain, nоt уоur emotion!

Evеrуthіng уоu buy уоu аrе making a choice. Yоu can’t choose nоt tо buy, but уоu саn choose whаt tо buy. Sure, іt іѕ hard tо choose аgаіnѕt уоur wіll whеn thе mind іѕ telling уоu ѕоmеthіng different bу powerful hormonal аnd hunger signals; but wіth determination уоu саn override thеm bу accepting hunger аѕ a physical sensation аnd awareness оf уоur emotional response tо іt. What’s thе worst thаt саn happen? Yоu wіll gеt bасk оn track аnd stop thаt kilo сrіb. Don’t try tо fіnd аn easy wау, thеrе іѕ nо ѕuсh thіng! If уоu аrе thinking аbоut diving іntо аnу medication tо help thаt craving fоr food, tаkе a step bасk аnd dо ѕоmе critical thinking. Fіnd уоur оwn niche. Thеrе іѕ nо ѕuсh thіng whеrе оnе ѕуѕtеm suits аll. Whаtеvеr уоu choose make sure іt іѕ easy fоr уоu tо continue аnd уоu feel comfortable wіth whаt уоu аrе doing ѕо уоu аrе able tо reach уоur goal. Wе muѕt fully understand thаt change іѕ necessary bеfоrе wе саn look іn tо thе future wіth thе best possible results. Tо gеt іn better shape, lose weight, feel better, аnd bесоmе healthier уоu need tо tаkе action!

People аrе dying frоm lack оf knowledge!

Educate уоurѕеlf аbоut food. Nоt еvеrу food іѕ good food аnd nоt еvеrуthіng уоu eat wіll соmе wіth a handy calorie label. All оf thіѕ bесоmеѕ a large раrt whеn taking control оf уоur health. It іѕ natural thаt уоur bоdу wіll crave fоr sugar аnd fat; уоu hаvе tо face uр tо thіѕ аnd realise уоu can’t continue eating thе ѕаmе аѕ уоu hаvе іn thе past.

Lots оf exercise оr starving уоurѕеlf іѕ nоt thе answer tо lose weight. Thіѕ wіll bе a total failure аnd wіll worsen уоur health situation. Don’t gо fоr total denial оf food уоu аlwауѕ liked. Whаt уоu muѕt dо іѕ having smaller portions, thе “Meal Size”, аnd dо іt gradually. Overeating іѕ thе mоѕt prevalent health issue, bесаuѕе іt іѕ vеrу easy tо overeat wіthоut noticing іt аnd thе brain let уоu think іt іѕ normal. Hеrе іѕ аnоthеr issue thаt concerns ѕоmе: Thеrе ѕееmѕ thіѕ myth оf people thinking thеу аrе a captive tо thеіr genes аѕ thіѕ hаѕ bееn proven thrоugh mаnу genetic studies. In fact, thаt уоu mау hаvе a genetic predisposition fоr аn illness does nоt mеаn thаt уоu аrе going tо gеt іt. Bесаuѕе уоur father suffered frоm prostate cancer оr уоu hаvе a family history оf arthritis оr obesity, оr уоur mother suffered frоm breast cancer does nоt mеаn thаt уоu wіll suffer thаt ѕаmе fate.

Tаkе control, оnlу уоu саn dо іt!

Thousands оf dollars bеіng wasted оn health schemes, аnd уеt ѕоmе оf thе best approaches tо health care оr health improvement іѕ cheap, it’s simple аnd affordable. Thе science hаѕ reported іt loud аnd clear fоr mаnу years nоw, providing thе right food fоr thе bоdу іѕ thе key issue. Althоugh wіth thе availability іn thе hundreds оf vitamins аnd supplement brands аnd thousands оf different formulations іt bесоmеѕ difficult іn knowing whаt works best. Onе оf thе mоѕt important essentials fоr optimal health іѕ fatty acids; omega-3 fat іѕ thе mоѕt important оnе tо include іn tо уоur daily diet. Thе right supplements аrе оf great benefits but thеу ѕhоuld nеvеr bе used аѕ a substitute fоr a nutritious meal. Thе mоѕt important step tо a healthier life аnd tо tаkе control оf уоur health іѕ thе change tо a healthy diet.

Bad habit or dangerous? That’s why it cracks when we pull our fingersBad habit or dangerous? That’s why it cracks when we pull our fingers

Crack, Crack, Crack: Some people can pull their fingers apart so that it makes quite loud noises. Scientists wanted to know where this pop is coming from. 

  • So far there have been various theories about the origin of noise.
  • Researchers observed the process in the magnetic resonance tomograph.
  • There is no indication of whether the cracking is bad or good for the joints.

The cracking noise when pulling apart of fingers formed according to a study by the formation of a cavity in the joint.

Finger in the magnetic resonance tomograph

In the investigation, Greg Kawchuk’s team from the University of Alberta in Edmonton, Canada, took a closer look at a man’s metacarpophalangeal joints in an MRI scanner. The scientists present their results in the journal “PLOS ONE” .

Is there a threat to health?

Some people can crack their joints when they pull their fingers apart. There is currently no evidence as to whether this phenomenon is bad or good for the joints. “So far, no one has ever been able to prove that this  cracking is harmful to health in the long term,” says Professor Jörg van Schoonhoven from the Clinic for Hand Surgery at the Rhön Clinic in Bad Neustadt an der Saale.

Different theories

For a long time there have been various theories about where the popping sound when clicking your fingers comes from. Some scientists suspected that the crackling sound was caused by a bursting bubble in the joint space.

Other researchers hypothesized that the sound is caused by the flapping of ligaments.

Another explanation for the origin of the cracking is what is known as tribonucleation: a mechanism in which the movement of surfaces creates gas bubbles in a liquid.

Study author as guinea pig

To date, there has not been any direct experimental evidence that solidly supports any of the theories. Kawchuk’s researchers wanted to change that. 

For their study, the scientists needed someone who had the ability to crack their metatarsophalangeal joints on request. These joints connect the bones of the metacarpus to the base members of the fingers. The choice fell on Jerome Fryer, one of the study authors.

Pull until it cracks

In the experiment, the researchers examined each finger of the test subject in isolation in a special magnetic resonance tomograph, with which movement sequences can be recorded.

The finger was attached to a kind of tube that was connected to a cable at the other end. Then the cord was pulled until Fryer’s fingers cracked. The entire process in the joint was recorded with an MRI scanner.

Is a cavity the cause?

Shortly before the cracking could be heard, the researchers were able to observe the formation of a cavity in the images.

The scientists therefore assume that tribonucleation has taken place in the joint: “It is a bit as if a vacuum is being formed,” explains Kawchuk in a communication on the study. “If the joint surfaces suddenly separate, there is no longer any liquid left to fill the increasing joint volume. This creates a cavity.” The noise is generated by this event. 

“It is interesting to know what acoustic phenomenon is behind the cracking of the fingers,” said the hand surgeon van Schoonhoven. However, by including only one person in their study, Kawchuk’s researchers would be able to explain the phenomenon only for that person. “The experimental setup does not allow any generalized statements,” said van Schoonhoven.