The latest news from German slaughterhouses have certainly given the vegetarians and vegans community a new boost. In addition to animal welfare and ecological aspects, avoiding meat is usually also based on the desire for a healthy diet. What does science say

1. Consensus: little meat is okay, but not really necessary

Every German eats 150 grams of meat and meat products on average every day. That doesn’t sound like a lot, but it clearly exceeds the maximum 600 grams that the German Nutrition Society per week finds acceptable. Many consumers are also significantly higher. It is these “meat eaters” who are mentioned in the studies on the harmful effects of meat consumption.

But even with those who eat a lot of meat, there are differences: because those who eat a lot of unprocessed meat, and at the same time high in fiber and low in sugar, have a low risk of disease. This is the case, for example, with the Paleo diet.

Experts consider the Mediterranean diet to be the best nutritional method in the world, and it has been for two decades. In 2019 she was once again named the best diet of the year by “US News” . A lot of vegetables, fish and olive oil end up on the plate, but little meat and processed foods.

In comparative studies, it is not vegetarians and vegans who do well, but people who eat little meat.

But you can also say with a clear conscience to Tilmann Kühn, nutritional epidemiologist at the German Cancer Research Center (DKFZ) in Heidelberg: “If you eat wholesome vegetarian food, your body is fine. On the contrary, according to scientific findings, a vegetarian diet is actually very healthy. ”With one small caveat:“ Less meat ”only makes sense if the calorie advantage is not topped up with pizza, biscuits or meat imitations.

2. Those who do not eat meat also live more healthily in other ways

Numerous studies have shown that the biggest meat fans usually do not have good eating habits. Even if you neglect the nutritional value of individual foods, a diet high in meat and sausage as well as sugar, white flour and saturated fats from ready-made foods is unhealthy. Because healthy foods such as vegetables, fruit, legumes, whole grains or nuts are definitely neglected.

3. meat or plant? Nutritional studies are conditionally meaningful

In the laboratory, it is possible to determine how certain nutrients affect human cells. Studies with humans don’t work like that. The health comparison “meat eaters versus vegetarians” is only possible in observational studies. Their conclusions are only an approximation of reality. Too many factors play a role in health for the question to be reduced to schnitzel and tofu . For example: is a chain-smoking vegan healthier than an athletic meat eater?

Epidemiological studies can never conclusively prove that meat consumption is unhealthy. And it is also not conclusively clear which individual ingredients are harmful to health.

4. When it comes to meat, it depends on the color

Beef, pork, lamb or sheep provide the so-called red meat. It is said to cause cardiovascular diseases and problems with the blood vessels.

For US researcher Stanley Hazen from the Cleveland Clinic, a metabolic product of the carnitine contained in red meat is responsible for this. To prove this, he had 113 test subjects eat 250 grams of steak a day for four weeks. A two-week break was followed by four weeks with a correspondingly large amount of (white) poultry meat and, at the end, a meat-free month.

The result , published in the “European Heart Journal”, showed a significant 3-fold increase in the TMAO plasma concentration during the steak weeks. TMAO is produced during the metabolism of carnitine and is a risk marker for hardening of the arteries in the blood vessels. The diet with poultry and vegetables led to a decrease in plasma concentrations in the test subjects.

Red meat is also directly or indirectly involved in the development of cancer.

For example, studies by the DKFZ have shown that people who eat a lot of red meat have increased biomarkers of certain roasting substances, such as those produced during roasting and grilling, swim in the blood. These people were at an increased risk of developing colon cancer.

In the large-scale EPIC study across Europe, 519,000 test persons were examined to find out the connection between diet and cancer .

The results show that red meat can increase the risk of colon cancer. Accordingly, the risk of the disease increases by almost 50 percent if the daily consumption of meat is 100 grams above the recommended amount. The same amount of sausage products increases the risk by as much as 70 percent.

The risk of stomach cancer is also said to be related to heavy meat consumption. In people infected with the Helicobacter pylori bacterium, the risk increases by a factor of five.

5. Theory 1: Iron makes meat unhealthy

There are various theories about why red meat is so problematic. The so-called iron load hypothesis is based on the fact that red meat contains a comparatively high amount of iron. This so-called heme iron has a high bioavailability, unlike iron from plant food, and thus enters the organism in larger quantities.

It has long been suggested that high levels of iron in the blood increase the risk of cancer . However, this theory has not yet been proven by studies.

6. Theory 2: BMMF make meat unhealthy

Scientists working with Nobel laureate Harald zur Hausen believe they have found another cause: a previously unknown class of pathogens is responsible for the increased risk of colon cancer .

These “Bovine Milk and Meat Factors (BMMF)” enter the human intestines through the consumption of meat and dairy products from European cattle. There it comes to a chronic inflammation, which indirectly promotes the development of colon cancer.

7. Avoiding meat protects the intestines

Vegetarian foods contain fiber, which has a positive effect on the microbiome in the gut. Vegans have a particularly large number of them. In addition to fruit and vegetables, lactic acid foods such as yogurt also support the intestinal flora. Vegetarians often consume these. Researchers from the University of New York have confirmed that vegans and vegetarians have more protective types of gut bacteria than meat eaters.

Meat also poses a cancer risk through its preparation and processing: for example, when meat is heated up, several potentially harmful substances are formed at the same time, including so-called polycyclic aromatic hydrocarbons (PAHs); curing also produces nitrosamines. These substances can promote the development of cancer, and above all they increase the risk of colon cancer. Methods such as curing and intense heating are particularly used for industrially processed meat, such as sausage and ham. Accordingly, processed meat products are particularly unhealthy.

8. Avoiding meat makes you slim

Researchers at the Max Planck Institute for Cognitive and Neurosciences (MPI CBS) and the Leipzig University Hospital examined almost 9,000 people, what connections there are between body and mind on the one hand and not consuming animal products on the other. regardless of age, gender and level of education. The study was published in June 2020 in the specialist magazine “Nutrients”.

The result of the physical impact: the less food of animal origin was on the menu, the lower the average body mass index (BMI) and thus the body weight. “Products that are excessively high in fat and sugar make you fat. They stimulate the appetite and delay the feeling of satiety. If you do without animal foods, you eat fewer such products on average, ”explains Evelyn Medawar, first author of the work.

9. Avoiding meat and the psyche

With regard to the psychological effects of the meatless diet, the Leipzig study found no particular susceptibility to neuroses in vegetarians. The study director Veronica Witte says: “Previous analyzes had found that more neurotic people generally leave out certain food groups more often. We focused solely on avoiding animal products and could not observe any correlation. ”No connection was found between a predominantly plant-based diet and depressive moods. There was evidence of this in previous studies.

However, the researchers found a difference in one of the determining factors of personality: the extroversion or introversion. People with predominantly plant-based foods on the menu are more introverted than those who eat primarily animal products. The study authors have not yet found an explanation for this.

It can be the cream you put on your face every morning, the beloved hamburger or a habit at the wheel – behind some everyday behavior lurks a danger that hardly anyone knows: you increase the risk of developing cancer. You should therefore leave the following things in the future:

1. Choose your window seat on the plane

Most people enjoy seeing the landscape from above during take-off and landing. Air travelers also like to look at the clouds of cotton wool under the clear blue sky. But if you fly often and sit by the window, you risk skin damage. The window panes keep out most of the UVB rays that cause sunburn. But they let through 47 percent of UVA rays. They are responsible for skin aging and a risk of skin cancer . Because: UV radiation can damage the genetic material. If damaged cells do not die, skin cancer can develop.

2. Insert all receipts

The receipts on thermal paper come from many cash registers and payment devices. And: bisphenol A (BPA). The substance has been classified by the EU as “of very high concern”. It endangers the brain development of the unborn, has been linked to male infertility, and can cause heart disease and cancer. Every time you touch thermal paper, BPA enters the body through the skin and accumulates there. In 2020, an EU-wide ban on thermal paper containing BPA will come into force.

3. Consume very hot drinks

Many people love their soup or tea steaming hot. But whoever swallows liquids above 65 degrees Celsius is putting his esophagus at risk . Because this irritates the tissue and in the long term cell damage occurs, from which cancer can develop.

4. Drive through the rush hour traffic with the window open

As long as there are no clean cars or driving bans in cities, diesel exhaust poses a specific risk for lung and bladder cancer. The WHO investigated this several years ago . Professional drivers or road construction workers are particularly at risk. But you can also get rid of dangerous diesel residues on daily trips through rush hour traffic with stop-and-go movement.

5. Avoid using condoms during sex

Those who live in a monogamous relationship will no longer be infected with the cancer-causing human papilloma virus. Because the greatest risk of HPV infection is unprotected intercourse with changing partners. The most common type of HPV cancer is cervical cancer, which usually develops many years after first exposure to the virus. Infection with certain HPV types can also lead to malignant tumors in the vagina, labia, anus and penis.

6. Use cosmetics with mineral oils

Oils care for the skin, but they shouldn’t be mineral oils. However, these are found in many cosmetic products, from skin cream to lipstick – for example when the ingredients are paraffin, petrolatum or mineral oil. The group of aromatic hydrocarbons (MOAH) poses a health risk. They have the potential to change the genetic makeup and cause cancer. They are filtered out of cosmetics – a decent residue remains, as the testers from the Stiftung Warentester found back in 2015.

7. Drink an after-work beer – or two, three …

Those who drink alcohol not only have an increased risk of liver cancer, but also of mouth and throat cancer and breast cancer. Unsurprisingly, this risk increases with the amount of alcohol. But there is no “safe” lower limit, especially for breast and liver cancer. Various substances that are produced when alcohol is broken down in the body probably play a role here.

8. Staring at your smartphone at night

Studies have shown a link between low levels of melatonin and a higher risk of cancer.The release of the sleep hormone is hindered when light breaks through the nighttime darkness . Smartphones and tablets are a common source of the bright glow in the dark bedroom nowadays. They delay falling asleep or wake the user with incoming messages that are immediately responded to. The sleep cycle is constantly interrupted and chronic sleep disorders develop – a risk factor for cancer.

If you don’t see a doctor, you won’t get cancer because of it. The regular check-ups and preventive appointments with the doctor but can ensure that a tumor early discovered no fatal cancer. The colonoscopy and cervical smear can even prevent abnormal cells from becoming cancer in the first place.