Dietary Reference Intakes The Essential Guide to Nutrient Requirements (2006) / Chapter Skim
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Pages 211-217
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From page 211... ...
PART III: CAROTENOIDS 211 CAROTENOIDS C arotenoids are natural pigments found in plants, and are abundant in deeply colored fruits and vegetables. The most prevalent carotenoids in North American diets are a-carotene, b-carotene, lycopene, lutein, zeaxanthin, and b-cryptoxanthin.
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From page 212... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 212 CAROTENOIDS AND THE BODY Function In plants, carotenoids function as pigments. In humans, the only known func tion of carotenoids is their provitamin A activity.
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From page 213... ...
PART III: CAROTENOIDS 213 for their health-promoting benefits are strongly supported. The existing recommendation to consume 5 or more servings of fruits and vegetables per day would provide 3–6 mg/day of b-carotene.
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From page 214... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 214 additional 15 percent of the b-carotene absorbed intact. However, absorption of most carotenoids from foods is considerably lower and can be as low as 2 per cent.
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From page 215... ...
PART III: CAROTENOIDS 215 poor intake or if tobacco smoke somehow reduces the circulating levels of carotenoids. The greater the intensity of smoking (the number of cigarettes per day)
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From page 216... ...
DRIs: THE ESSENTIAL GUIDE TO NUTRIENT REQUIREMENTS 216 effects are well beyond the concentrations achieved through foods. So, although 20 mg/day of supplemental b-carotene is enough to raise blood concentrations to a range associated with increased lung cancer risk, the same amount of b-carotene in foods is not.
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From page 217... ...
PART III: CAROTENOIDS 217 KEY POINTS FOR CAROTENOIDS Carotenoids are natural pigments found in plants, and are 3 abundant in deeply colored fruits and vegetables. Certain carotenoids function as a source of vitamin A in humans.
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