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Phytochemicals

Phytochemicals are not vitamins or minerals, but chemicals that are found in plants. "Phyto" is the Greek word for plant. There are many "families" of phytochemicals, and they help the body in a variety of ways. Though the mechanism is not completely clear, phytochemicals' actions may protect us from a host of diseases. Some of these beneficial chemicals block various hormone actions and metabolic pathways that are associated with the development of cancer and heart disease, and other chemicals stimulate protective enzymes.

Phytochemicals are in plants and plant-derived foods. They are naturally occurring, non-nutritive chemicals. The phytochemicals appear to work alone and in combination, and perhaps in conjunction with vitamins and other nutrients in food, to prevent, halt or lessen disease. The phytochemical is often found in the coloring agent in fruits and vegetables, so eating the brighter colored types may have benefits. However, there are also several beneficial phytochemicals in colorless or less colorful fruits and vegetables as well. For example, onions and corn are both full of phytochemicals. Therefore make sure you eat a wide variety of fruits and vegetables to get all of the possible health benefits from phytochemicals.

INCREASING YOUR PHYTOCHEMICAL INTAKE

Clearly, with such a wide variety of protective phytochemicals in fruits, vegetables, whole grains, nuts, legumes, and herbal seasonings, the regular consumption of these foods is essential to ensuring a healthier population that has lower rates of heart disease and cancer. The US Department of Agriculture Food Guide Pyramid recommends that adults consume 5-9 servings a day of fruits and vegetables.

Adapted from: Vegetarian Nutrition, a dietetic practice group of The American Dietetic Association, 1998; Today’s Dietitian ,January 1999; IDEA Health & Fitness Source, February 1999; and recommendations from the American Institute for Cancer Research.

Some of the best known Phytochemicals and their benefits and sources

Phytochemical

Potential Health Benefits

Food Source

Anthocyanidins

Reduce risk of heart disease

Grapes, raspberries, blueberries, cherries

Carotenoids

Encourage normal cell growth

Reduce risk of cancer

Yellow-orange vegetables and fruits, red fruits,

green leafy vegetables

Catechins

Reduce risk of cancer

Green tea

Chalcones

Reduce risk of cancer

Licorice

Coumarins

Reduce risk of cancer

Carrots, caraway, celery, parsley

Curcumins

Reduce risk of cancer

Turmeric, ginger

Diallyl sulfide, disulfides, trisulfides

Reduce risk of cancer

Reduce risk of heart disease

Antimicrobial

Onions, garlic, chives, leeks

Dithiolthiones

Reduce risk of cancer

Cruciferous vegetables

Ellagic acid

Reduce risk of cancer

Grapes, strawberries, raspberries, nuts

Flavonoids

Reduce risk of heart disease

Reduce risk of cancer

Most fruits and vegetables

Glucarates

Reduce risk of cancer

Citrus, grains, tomatoes, bell peppers

Indoles, isothiocyanates

Reduce risk of cancer

Broccoli, cabbage, cauliflower, radish

Isoflavones

Lower blood cholesterol

Reduce risk of cancer

Reduce risk of heart disease

Reduce risk of osteoporosis

Soy foods (soybeans, tofu, soy milk,

soy protein powder)

 

Alph-linolenic acid

Lower blood cholesterol
Reduce hypertension
Reduce risk of heart disease
Reduce risk of cancer
Reduce inflammation
Improve immune system

Vegetable oils (canola or soybean), flax seed

Lignans

Lower cholesterol
Reduce risk of cancer

Soybeans, flax seed, sesame

Liminiods

Reduce risk of cancer

Citrus

Phenolic acids

Reduce risk of cancer

Berries, grapes, nuts, whole grains

Phthalides, polyacetylenes

Reduce risk of cancer

Caraway, celery, cumin, dill, fennel, parsley

Phytates

Reduce risk of cancer

Grains, legumes

Phytosterols

Reduce risk of cancer

Nuts, seeds, legumes

Saponins

Reduce risk of cancer

Beans, herbs, licorice root

Terpenoids

Reduce risk of cancer

Cherries, citrus, herbs (basil, oregano, thyme, sage)