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Should I Be Concerned That Arsenic Is in My Rice?
By Atli Arnarson
Arsenic is one of the world's most toxic elements. Throughout history, it has been infiltrating the food chain and finding its way into our foods.
Photo credit: Shutterstock
However, this problem is now getting worse. Widespread pollution is raising the levels of arsenic in foods, posing a serious health risk.
Recently, studies have detected high levels of arsenic in rice. This is a major concern, since rice is a staple food for a large part of the world's population.
Should you be worried? Let's have a look.
What is Arsenic?
Arsenic is a toxic trace element, denoted by the symbol As.
It is not usually found on its own. Rather, it is bound with other elements in chemical compounds.
These compounds can be divided into two broad categories (1):
- Organic arsenic: mainly found in plant and animal tissues.
- Inorganic arsenic: found in rocks and soil or dissolved in water. This is the more toxic form.
Both forms are naturally present in the environment, but their levels have been increasing due to pollution.
For a number of reasons, rice may accumulate a significant amount of inorganic arsenic (the more toxic form) from the environment.
Bottom Line: Arsenic is a toxic element naturally present in our environment. It is divided into two groups, organic and inorganic arsenic, with inorganic arsenic being more toxic.
Dietary Sources of Arsenic
Arsenic is found in nearly all foods and drinks, but is usually only found in small amounts.
In contrast, relatively high levels are found in:
- Contaminated drinking water: Millions of people around the world are exposed to drinking water that contains high amounts of inorganic arsenic. This is most common in South America and Asia (2, 3).
- Seafood: Fish, shrimp, shellfish and other seafood may contain significant amounts of organic arsenic, the less toxic form. However, mussels and certain types of seaweed may contain inorganic arsenic as well (4, 5, 6).
- Rice and rice-based foods: Rice accumulates more arsenic than other food crops. In fact, it is the single biggest food source of inorganic arsenic, which is the more toxic form (7, 8, 9, 10).
High levels of inorganic arsenic have been detected in many rice-based products, such as:
- Rice milk (11).
- Rice bran (12, 13).
- Rice-based breakfast cereals (13).
- Rice cereal (baby rice) (14, 15).
- Rice crackers (13).
- Brown rice syrup (16).
- Cereal bars containing rice and/or brown rice syrup.
Bottom Line: Seafood contains arsenic, but mostly the organic form. Rice and rice-based products may contain high levels of the inorganic (more toxic) form.
Why is Arsenic Found in Rice?
Arsenic naturally occurs in water, soil and rocks, but its levels may be higher in some areas than others.
It readily enters the food chain and may accumulate in significant amounts in both animals and plants, some of which are eaten by humans.
As a result of human activities, arsenic pollution has been rising.
The main sources of arsenic pollution include certain pesticides and herbicides, wood preservatives, phosphate fertilizers, industrial waste, mining activities, coal burning and smelting (17, 18, 19).
From groundwater, arsenic finds its way into wells and other water supplies that may be used for crop irrigation and cooking (22).
Paddy rice is particularly susceptible to arsenic contamination, for three reasons:
- It is grown in flooded fields (paddy fields) that require high quantities of irrigation water. In many areas, this irrigation water is contaminated with arsenic (22).
- Arsenic may accumulate in the soil of paddy fields, worsening the problem (23).
- Rice absorbs more arsenic from water and soil compared to other common food crops (8).
Bottom Line: Rice efficiently absorbs arsenic from irrigation water, soil and even cooking water. Some of that arsenic is of natural origin, but pollution is often responsible for higher levels.
Health Effects of Arsenic
Dietary arsenic is generally present in low amounts, and does not cause any immediate symptoms of poisoning.
However, long-term ingestion of inorganic arsenic may cause various health problems and increase the risk of chronic diseases. These include:
- Various types of cancer (28, 29, 30, 31).
- Narrowing or blockage of blood vessels (vascular disease).
- High blood pressure (hypertension) (32).
- Heart disease (33, 34).
- Type 2 diabetes (35).
- Impaired concentration, learning and memory (38, 39).
- Reduced intelligence and social competence (40, 41, 42).
Some of these impairments may have taken place before birth. Several studies indicate that high arsenic intake among pregnant women has adverse effects on the fetus, increasing the risk of birth defects and hindering development (43).
Bottom Line: The toxic symptoms of dietary arsenic usually take a long time to develop. Long-term ingestion may increase the risk of various health problems, including cancer, heart disease, type 2 diabetes and decreased intelligence.
Is Arsenic in Rice a Concern?
Yes. There is no doubt about it, arsenic in rice is a problem.
This may pose a health risk to those who eat rice every day in considerable amounts.
This mainly applies to people in Asia or people with Asian-based diets.
Other groups who may eat a lot of rice products include young children and those on a milk-free or gluten-free diet. Rice-based infant formulas, rice crackers, pudding and rice milk sometimes make up a large portion of these diets.
Of course, not all rice contains high arsenic levels, but determining the arsenic content of a particular rice product may be difficult (or impossible) without actually measuring it in a lab.
Bottom Line: Arsenic contamination is a serious concern for the millions of people who rely on rice as their staple food. Young children are also at risk if rice-based products make up a large part of their diet.
How to Reduce Arsenic in Rice
The arsenic content of rice can be reduced by washing and cooking the rice with clean water that is low in arsenic.
The following tips should help reduce the arsenic content of your rice:
- Avoid using small amounts of water when cooking.
- Wash the rice before cooking. This method may remove 10–28 percent of the arsenic (45, 47).
- Brown rice contains higher amounts of arsenic than white rice. If you eat large amounts of rice, the white variety may be a better choice (12, 49, 50).
- Choose aromatic rice, such as basmati or jasmine (51).
- Choose rice from the Himalayan region, including North India, North Pakistan and Nepal (7).
- If possible, avoid rice that is grown during the dry season. The use of arsenic-contaminated water is more common during that time (7, 23).
The last and most important piece of advice concerns your diet as a whole. Make sure to diversify your diet by eating many different foods. Your diet should never be dominated by one type of food.
Not only does this ensure that you are getting all the nutrients you need, it also prevents you from getting too much of one thing.
Bottom Line: You can follow a few simple cooking methods tips to reduce the arsenic content of rice. Also keep in mind that some types of rice, such as basmati and jasmine, are lower in arsenic.
Take Home Message
Arsenic in rice is a serious concern for many people.
A huge percentage of the world's population relies on rice as a main food source, and millions of people may be at risk of developing arsenic-related health problems.
That being said, if you eat rice in moderation as a part of a varied diet, you should be totally fine.
However, if rice happens to be a large part of your diet, make sure that it was grown in a non-polluted area.
This article was reposted from our media associate Authority Nutrition.
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