General Health

There is much still to be learned about the relationship between the foods we eat and our risk of getting cancer and heart disease. The NHLBI and NCI are conducting a great deal of research to find out more about this relationship. There is, however, a lot that we know now.

The relationship of diet to cancer and the relationship of diet to risk factors for heart disease are summarized below:

Obesity

We know that obesity is associated with high blood pressure, high blood cholesterol, diabetes, heart disease, and stroke. Extreme obesity has also been linked to several cancers. This means that if you are obese, losing weight may reduce your chances of developing these serious diseases or conditions. If you already suffer from hypertension and are overweight, weight loss alone can often lower your blood pressure to normal levels. Because fat (both saturated and unsaturated fat) provides more than twice the number of calories provided by equal weights of carbohydrate or protein, decreasing the fat in your diet may help you lose weight as well as help reduce your risk of cancer and heart disease. Today, most Americans get about 37 percent of their daily calories from fat. Many experts suggest that fat should be reduced to 30 percent or less of calories.

Heart Disease

We know that blood cholesterol levels are greatly influenced by the amount of saturated fat and cholesterol found in many of the foods we eat. These raise blood cholesterol levels (Of the two, saturated fat seems to be the major dietary factor which affects blood cholesterol). To reduce your blood cholesterol level, it is important to eat less saturated fat and cholesterol. Saturated fat and cholesterol are often found together in foods. Saturated fat in the U.S. diet is provided primarily by animal products such as the fat in meat, butter, whole milk, cream, cheese, and ice cream. There are a few vegetable fats–coconut oil, cocoa butter, palm kernel and palm oils which are also high in saturated fat. Cholesterol is found only in animal products eggs, meat, poultry, fish and dairy products. Plant foods such as vegetables, grains, cereals, nuts, and seeds do not contain cholesterol. A few foods are high in cholesterol but relatively low in fat–for example, egg yolks and liver.

Cancer

The National Cancer Institute estimates that about 80 percent of all cancers may be related to smoking, diet, and the environment. They also estimate that about one-third of all cancer deaths may be related to the foods we eat. Diets high in fats of all kinds have been linked to certain cancers, particularly those of the breast, colon, lining of the uterus, and prostate gland. Some studies have suggested that fat may act as a cancer promoter (an agent that speeds up the development of cancer).

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p>There is some evidence that diets rich in vitamin A, vitamin C, and beta-carotene (the plant form of vitamin A) may help reduce the risk of certain cancers. The evidence we have about vitamins A and C comes from studies of these vitamins as they are found in foods. That is why NCI recommends that you eat a variety of foods rich in vitamins rather than relying on vitamin supplements. Good sources of vitamin A include yellow-orange vegetables such as carrots, winter squash, sweet potatoes and pumpkin; and yellow-orange fruits such as peaches, cantaloupes and mangoes. Sources of vitamin C include dark-green leafy vegetables such as kale, spinach, and watercress; broccoli and asparagus; and tomatoes. Some fruit sources of vitamin C are oranges, lemons, grapefruit, peaches, berries, and cantaloupe.

Picture Credit : NationalGeographic

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