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CALIFORNIA RAISINS
Raisin Compounds May Reduce Cavity-Causing Bacteria
By Julie Miller Jones PhD, CNS, LN

Raisins contain phenolics and other antioxidants that help prevent the growth of mouth bacteria. Thus, even though they adhere to tooth surfaces, compounds in raisins do not promote the growth of decaycausing bacteria.

Dental health and nutrition have always been linked. Good food choices help to build strong teeth, and poor food choices are one of the culprits in gum disease (gingivitis) and cavities (dental caries). Several factors work together in the mouth to promote tooth decay. Prevention strategies involve inhibiting or changing one of the factors.

Dental Caries and New Raisin Research
While raisins are sticky, recent data shows that raisins contain phenolics and other antioxidants that help prevent the production of acid by mouth bacteria. Dr. Christine Wu and her colleagues 1,2 from the University of Illinois at Chicago Dental School have shown that various compounds in raisins – oleanolic acid and its derivatives – inhibit growth of Streptococcus mutans and the periodontal pathogen Porphyromonas gingivalis that causes gum disease. These compounds also interfere with adherence of these cariogenic bacteria. Therefore, raisins may not promote dental caries like other sticky foods. Other research has indicated polyphenolic compounds in raisins, such as catechins, epicatechins and flavonols, have anticariogenic properties.1,2,3 Catechins have been shown to have a direct bactericidal effect against Streptococcus mutans and Streptococcus sobrinus and prevent adherence of bacteria to teeth. Further, they inhibit two enzymes – glucosyl transferase and amylase – that could increase dental caries. The glucosyl transferase is involved in the biosynthesis of sticky glucan involved in plaque, and the amylase hydrolyzes starches into sugars which is the first step in acid production. In addition, catechin and other phenolic antioxidants quell reactive oxygen species that are root causes of inflammation in gingivitis.
© 2006. CALIFORNIA RAISIN MARKETING BOARD

Dental Caries - Background

Decay-causing Streptococcus mutans are normal mouth inhabitants. These bacterias can convert sugars and starches from foods into acids. Plaque is formed when bacteria, acid, food debris and saliva combine in the mouth. This sticky mixture accumulates on teeth within 20 minutes after eating. Plaque that remains on the teeth forms tartar. Both plaque and tartar irritate the gums, resulting in gingivitis and, ultimately, periodontitis. The number one strategy for keeping teeth healthy is good dental hygiene, including frequent brushing and flossing and use of fluoride products.

Antioxidants

Food choice is also a strategy for keeping teeth healthy. Diets that build strong teeth and enamel are critical to teeth resistant to dental caries. While some experimental and animal studies suggest that fruits and some starchy staples are cariogenic, this is not supported by epidemiological data. Several studies show that high intakes of starchy staple foods, such as vegetables and fruits, are associated with low levels of dental caries. 4,5 In fact, a large survey of 2-to 5-year-old children showed that eating fewer than 5 servings of vegetables and fruits more than tripled the risk of tooth decay.6 Since discretionary foods and snacks with sugars and starches have long been suspected of increasing the risk of tooth decay, health professionals have recommended limiting their intake. This has been especially true when recommending between-meal snacks if the food sticks to the tooth surface. Sticky foods have been shown to be more cariogenic than non-sticky foods because they remain on the tooth surface.7 Dental professionals have commonly recommended that healthy choices, such as raisins and other dried fruit, be part of a meal rather than a between-meal snack because they were considered sticky. However, in light of this new research, California Raisins may be an ideal snack. They provide nutrients, energy, sweetness and a serving of fruit to nourish the whole body without promoting dental caries.

Dental Caries and Food Choices

Fiber

Fat Free

Cholesterol Free

Natural

1. Wu CD, Zhu M, Su BN, Workman JT, Kinghorn AD. Phytochemicals in raisins inhibit growth and adherence of plaque bacteria. Presented to the International Association for Dental Research at Guthenburg, Sweden, June, 2003. 2. Rivera-Cruz JF, Zhu M, Su B, Kinghorn AD, Wu CD. Antimicrobial phytochemicals in Thompson seedless raisins (Vitis vinifera L.) inhibit dental plaque bacteria, Presented to the American Society of Microbiology, Atlanta, GA, June, 2005. 3. Hamilton-Miller JM. Anti-cariogenic properties of tea (Camellia sinensis). J Med Microbiol. 2001 Apr; 50(4):299-302. 4. Moynihan PJ. The role of diet and nutrition in the etiology and prevention of oral diseases. Bull World Health Organ. 2005 Sep; 83(9):694-9. 5. Dugmore CR, Rock WP. A multifactorial analysis of factors associated with dental erosion. Br Dent J. 2004 Mar; 196(5):283-6; discussion 273. 6. Dye BA, Shenkin JD, Ogden CL, Marshall TA, Levy SM, Kanellis MJ. The relationship between healthful eating practices and dental caries in children aged 2-5 years in the United States, 19881994. J Am Dent Assoc. 2004 Jan;135(1):55-66. 7. Gustafsson BE, Quensel CE, Lanke LS, Lundquist C, Grahnen H, Bonow EE, et al. The Vipeholm dental caries study. The effect of different levels of carbohydrate intake on caries activity in 436 individuals observed for 5 years. Acta Odontologica Scandinavica, 1954;11:232-364.

CALIFORNIA RAISIN MARKETING BOARD
3445 N. First Street, Suite 101 • Fresno, CA 93726 Tel. (559) 248-0287 • Fax (559) 224-7016

Visit LoveYourRaisins.com to learn more about California Raisins.

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