A host of protective chemicals
Wholegrain cereals contain many different phytochemicals that researchers have linked to significant health benefits. These phytochemicals include:

Coronary heart disease
Cereal fiber offers greater protection against the risk of heart attack than the fiber from fruits and vegetables. A heart attack is almost always preceded by a condition called coronary heart disease. Over the years, fatty deposits or 'plaques' build up inside one or both of the coronary arteries (atherosclerosis). This constant silting narrows the artery, until a blood clot blocks the passage of blood altogether. Too much blood cholesterol contributes to atherosclerosis. Regularly eating cereals that are rich in soluble fiber, such as oats and psyllium, has been found to significantly reduce the amount of cholesterol circulating in the bloodstream. Eating just 3gm of soluble fiber from oat bran lowers the blood cholesterol by as much as two per cent.

Diabetes
There is evidence that eating foods that are slowly digested and high in soluble fiber might reduce the risk of developing non-insulin dependent diabetes, by reducing the need for large quantities of insulin to be released into the bloodstream. Cereal fiber has been shown to be particularly protective against this condition. It is preferable for diabetics to consume wholegrain cereal products rather than refined cereals, due to the higher glycemic index of refined cereal products.

Obesity
People who are obese tend to have energy-dense diets. High fibre foods, such as wholegrain breads and cereals, can be an effective part of any weight loss program. They take longer to digest and create a feeling of fullness, which discourages overeating. They also help to lower the energy density of the diet. Cereals are also naturally low in fat.

Constipation and diverticular disease
High fiber foods, such as wholegrain cereal products, increase movement of food through the digestive tract. The result is increased stool bulk, softer, larger stools and more frequent bowel action. This increased bowel action provides a good environment for beneficial bacteria, while at the same time decreasing levels of destructive bacteria. A high fiber diet including both soluble and insoluble fiber has been associated with decreased risk of colon cancer and diverticular disease.

Other health benefits
There are many health benefits that have been linked to a diet high in grain foods, for example:

Too many refined cereals pose health risks
When a cereal is processed to remove the bran and wheat germ, many of the vitamins, minerals and phytochemicals are lost. The refined cereal, such as white flour, generally has a higher glycemic index than its wholegrain counterpart. This means that consuming refined cereals causes a sharp rise in blood sugars, demanding a strong response from the pancreas.

A diet full of high glycemic index foods has been linked to the development of diabetes. Studies have also found that people who eat large amounts of refined cereals do so at the expense of more nutritious foods like fruits and vegetables. This increases the risk of certain diseases, such as some types of cancer.

Things to remember:
Cereals and wholegrain foods can reduce the risk of developing certain diseases, including coronary heart disease, colon cancer, diabetes and diverticular disease.

A high intake of refined cereals has been linked to diabetes and some types of cancer.