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http://www.livestrong.com/article/416466-the-harmful-effect-of-sodium-nitrite-in-food/

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https://www.hsph.harvard.edu/nutritionsource/2015/11/03/report-says-eating-processed-meat-is-carcinogenic-understanding-the-findings/

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https://www.google.co.uk/amp/www.bbc.co.uk/news/amp/38370057#ampshare=http://www.bbc.co.uk/news/health-38370057

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Eating processed meat might make asthma symptoms worse, say researchers.

Consuming more than four portions a week is a risk, suggests the study of nearly 1,000 French people, published in the journal Thorax.

The researchers believe it could be a preservative called nitrite used in meats such as sausages, salami and ham that aggravates the airways.

But experts say the link has not been proved and more investigations are needed.

Rather than worry about one type of food, people should be eating a healthy and varied diet, they advise.

Processed meat has already been linked with cancer.
What is processed meat? How much of a cancer risk is processed meat?
Experts say people should eat no more than 70g a day of red and processed meat for good health.

That's about one sausage plus a rasher of bacon a day.

Meat wheeze

The people in the study had been taking part in a French survey about food and health, spanning a decade from 2003 to 2013.

Around half of them were asthma patients. The rest - the control subjects - had no history of the condition.

The survey looked specifically at asthma symptoms - breathlessness, wheeze, chest tightness - and intake of cured meat: a single portion was two slices of ham, one sausage or two slices of salami.

Among the people with asthma, higher meat consumption was linked with a worsening of their lung symptoms.

People who said they consumed more than four portions a week - eight slices of ham or four sausages, for example - had the biggest deterioration of their asthma by the end of the study.

The experts stress that their work cannot prove diet is definitely to blame. There are lots of factors in a person's life that can make their asthma worse.

The researchers tried to eliminate the most obvious ones, controlling for things like obesity, and the link between processed meat and worsening asthma remained.

Dr Erika Kennington, Head of Research at Asthma UK says: "Although certain foods can be triggers for allergies in some people, there is no specific dietary advice to manage asthma symptoms generally. For most people with asthma, healthy eating advice is exactly the same as it is for everyone else: follow a balanced diet that includes plenty of fresh and unprocessed food and is low in sugar, salt and saturated fat."

Catherine Collins of the British Dietetic Association recommended "a varied and Mediterranean-style diet", containing plenty of fresh produce, "whether you have asthma or not."

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Processed meat 'could be bad for asthma' - BBC News

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Eating processed meat might make asthma symptoms worse, say researchers. Consuming more than four portions a week is a risk, suggests the study of nearly 1,000 French people, published in the journal Thorax. The researchers believe it could be a preservative called nitrite used in meats such as sausages, salami and ham that aggravates the airways.

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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1552029/#!po=2.50000

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Sara Ipatenco

Sara Ipatenco has taught writing, health and nutrition. She started writing in 2007 and has been published in Teaching Tolerance magazine. Ipatenco holds a bachelor's degree and a master's degree in education, both from the University of Denver.

Your body relies on sufficient production of hemoglobin to ensure that all internal systems get the oxygen they need to function properly. According to the American Medical Association, a diet high in sodium nitrites may lead to a health condition called methemoglobinemia, which is the inability of your red blood cells to transport oxygen throughout your body. This condition causes respiratory problems and can be fatal. Reducing your intake of foods with sodium nitrites can help prevent this condition.

The reaction that your body has to the ingestion of sodium nitrite can vary depending on how much of it you consume from foods. Phyllis A. Balch reports in her book, "Prescription for Dietary Wellness," that the salts in sodium nitrites can cause a reaction that produces a chemical called nitrosamines, which increase your risk of developing cancer. The American Medical Association says that sodium nitrites can lead to gastrointestinal and brain cancer. Restricting your intake can help prevent these reactions from occurring.

Type 1 diabetes can occur in infants and young children when their pancreas does not have the ability to produce insulin. This can be a life-threatening condition if insulin levels are not monitored closely. High intake of sodium nitrites while pregnant may increase your baby's risk of developing Type 1 diabetes. The American Medical Association says that this risk is higher for male babies and occurs because of your body's reaction to sodium nitrite. The risk of juvenile Type 1 diabetes can also occur if your water supply is high in sodium nitrites and you drink it while pregnant or offer it to your young children.

Eating a diet high in foods that contain sodium nitrites can cause irritation to your digestive system, including your mouth, esophagus and stomach. If irritation occurs, you may experience pain, particularly abdominal pain. High consumption of sodium nitrites is also associated with damage to your blood and your blood vessels. At toxic levels, sodium nitrites can also lead to rapid heart rate and difficulty breathing.

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The Harmful Effect of Sodium Nitrite in Food

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Sodium nitrite is a common ingredient added to processed meats and fish that helps preserve the food and prevent bacterial growth that can cause botulism. This food additive also adds attractive color to meat and fish. While sodium nitrite is naturally present in many fruits and vegetables, its use as a food preservative can be damaging to your...

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Nitrites noted
https://www.hsph.harvard.edu/news/press-releases/red-meat-consumption-linked-to-increased-risk-of-total-cardiovascular-and-cancer-mortality/

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Have you ever wondered how bacon is made? Here's a look inside a meat processing plant to show the process from start to finish