Atherosclerosis
Regular consumption of whole-grain foods is
associated with a reduction in the risk of coronary heart disease. Diets high in fibers found
in oats, psyllium seeds, fruit (pectin), and
beans (guar gum) are linked to a reduction of cholesterol levels.
Diabetes
Eating carbohydrate-containing foods, whether they are high in sugar or high in starch
(such as bread,
potatoes, processed breakfast cereals, and rice), temporarily raises blood sugar and insulin levels.
The blood sugar-raising effect of a food, called its “glycemic index,” depends on
how rapidly its carbohydrate is absorbed. Many starchy foods have a glycemic index similar to
sucrose (table sugar). People eating large amounts of foods with high glycemic indices (such
as those mentioned above), have been reported to be at increased risk of type 2 diabetes. On
the other hand, eating a diet high in carbohydrate-rich foods with low glycemic indices is
associated with a low risk of type 2 diabetes. Due mostly to the health-promoting effects of
soluble fiber found in beans, peas, fruit, and oats, these foods have low glycemic indices
despite their high carbohydrate content.
High-fiber supplements, such guar gum, which is derived from beans, have improved glucose
tolerance in some studies. A review of the research revealed that the extent to which moderate
amounts of fiber help people with diabetes in the long term is still unknown, and the lack of
many long-term studies has led some researchers to question the importance of fiber in
improving diabetes. Nonetheless, most doctors advise people with diabetes to eat a diet high
in fiber. Focus should be placed on beans, fruits, vegetables, seeds, oats, and whole-grain
products.
Gout
Foods that are high in compounds called purines raise uric acid levels in the body and
increase the risk of gout. Restricting purine intake can reduce the risk of an attack in
individuals susceptible to gout. Foods high in purines include protein-rich foods, such as
dried beans and peas.
Heart attack
A high-fiber diet, particularly one high in
water-soluble fiber (as in legumes), is associated with decreased risk of both fatal and
nonfatal heart attacks, probably because fiber is known to lower cholesterol. However, large
trials separately studying men and women, and following them for years, have linked the
greatest protection to water-insoluble fiber (from cereals), though scientists have yet to
understand why. Until the details are better understood, doctors often recommend increasing
intake of both soluble and insoluble fiber by eating plenty of beans, fruit, vegetables, oats,
and whole grains.
High cholesterol
Soluble fiber from beans, oats, psyllium seed,
glucomannan, and fruit pectin has lowered cholesterol levels in most trials. Doctors often
recommend that people with elevated cholesterol eat more of these high-soluble-fiber
foods.
High triglycerides
(TG)
Diets high in fiber have reduced TG levels in several clinical trials, but have had no
effect in other clinical trials. Water-soluble fibers, such as guar gum and other gums found
in beans, may be particularly helpful in lowering triglycerides.
Indigestion
Conventional treatment includes the avoidance of problem foods, such as citrus fruits,
spicy foods, fatty foods, milk, and beans.
Irritable bowel
syndrome (IBS)
The conventional treatment for IBS includes limiting intake of beans, dairy products, and foods containing caffeine, fructose, or
sorbitol.
Parkinson’s
disease
The relationship between Parkinson’s disease,
antioxidants in general, and vitamin E in particular,
remains unclear. Some preliminary studies have indicated that high dietary intakes of
antioxidant nutrients, especially vitamin E, are associated with a low risk of
Parkinson’s disease, even though Parkinson’s patients are not deficient in vitamin
E. The correlation between protection from Parkinson’s and dietary vitamin E may not be
due to vitamin E itself, however. Legumes (beans and peas) contain relatively high amounts of
vitamin E. Separate from their vitamin E content, legumes have been associated with low risk
of Parkinson’s disease. In other words, “high vitamin E intake” may be a
marker for diets high in legumes, and legumes may protect against Parkinson’s disease
for reasons as yet undiscovered but unrelated to their vitamin E content.
Pregnancy
Pregnant women should consume 1,500 mg of calcium per
day. Food sources of calcium include milk products, dark green leafy vegetables, tofu, sardines (canned with edible bones), salmon (canned with edible bones), peas, and beans.
