high glycemic diets and blindness
Consuming higher-than-average amounts of carbohydrates that cause blood sugar levels to spike and fall rapidly could be a risk factor for central vision loss with aging. Scientists supported by the Agricultural Research Service (ARS) and grants reported the findings this year in the American Journal of Clinical Nutrition.
ARS is the U.S. Department of Agriculture's chief scientific research agency.
The study was led by Chung-Jung Chiu with Allen Taylor, both at the Jean Mayer USDA Human Nutrition Research Center on Aging (HNRCA) in Boston, Mass. Taylor is director of the Laboratory for Nutrition and Vision Research at the HNRCA.
The researchers analyzed dietary intake and other data from more than 4,000 men and women aged 55 to 80 participating in the Age-Related Eye Disease Study, or AREDS.
Diets high in carbohydrates that are quickly digested and absorbed, resulting in a rapid rise in blood sugar levels, are considered high-glycemic-index diets. Examples of such "fast carb" foods are white bread, rice, potatoes and pasta, and also sugars and corn syrups. Carbohydrates leading to a more gradual rise and fall in blood sugar levels comprise low-glycemic-index diets.
Though "slow carb" foods are often listed as whole-grain versions of bread, rice and pasta, truth be told a lot of these foods have just as high a glycemic load as their processed breatheren. For example, "whole wheat macaroni" has a pretty high glycemic load of 17, while regular old junky "enriched" macaroni has a slightly lower glycemic load of 16. Check the glycemic load of any food on the Nutrition Data Website . (Remember, numbers don't exist for every single food, but they do for most carbohydrates, which raise blood sugar the quickest.)
Central vision loss is one of the first signs of age-related macular degeneration (AMD), a disease that is one of the leading causes of blindness among the elderly.
Consuming a diet high in fast carbs is also suspected of being involved in the vision loss that sometimes occurs in people with diabetes. The researchers theorize that the type of damage to eye tissue produced by fast carbs could be similar in both AMD and diabetic eye disease.
At this time, there is no effective cure for AMD, so finding modifiable risk factors is important. While it's too soon to recommend dietary slow carbs as a preventive strategy for AMD, replacing fast carbs with whole grains may soon prove to be an early dietary intervention to slow its progression.
Source: USDA Agricultural Research News Service
ARS is the U.S. Department of Agriculture's chief scientific research agency.
The study was led by Chung-Jung Chiu with Allen Taylor, both at the Jean Mayer USDA Human Nutrition Research Center on Aging (HNRCA) in Boston, Mass. Taylor is director of the Laboratory for Nutrition and Vision Research at the HNRCA.
The researchers analyzed dietary intake and other data from more than 4,000 men and women aged 55 to 80 participating in the Age-Related Eye Disease Study, or AREDS.
Diets high in carbohydrates that are quickly digested and absorbed, resulting in a rapid rise in blood sugar levels, are considered high-glycemic-index diets. Examples of such "fast carb" foods are white bread, rice, potatoes and pasta, and also sugars and corn syrups. Carbohydrates leading to a more gradual rise and fall in blood sugar levels comprise low-glycemic-index diets.
Though "slow carb" foods are often listed as whole-grain versions of bread, rice and pasta, truth be told a lot of these foods have just as high a glycemic load as their processed breatheren. For example, "whole wheat macaroni" has a pretty high glycemic load of 17, while regular old junky "enriched" macaroni has a slightly lower glycemic load of 16. Check the glycemic load of any food on the Nutrition Data Website . (Remember, numbers don't exist for every single food, but they do for most carbohydrates, which raise blood sugar the quickest.)
Central vision loss is one of the first signs of age-related macular degeneration (AMD), a disease that is one of the leading causes of blindness among the elderly.
Consuming a diet high in fast carbs is also suspected of being involved in the vision loss that sometimes occurs in people with diabetes. The researchers theorize that the type of damage to eye tissue produced by fast carbs could be similar in both AMD and diabetic eye disease.
At this time, there is no effective cure for AMD, so finding modifiable risk factors is important. While it's too soon to recommend dietary slow carbs as a preventive strategy for AMD, replacing fast carbs with whole grains may soon prove to be an early dietary intervention to slow its progression.
Source: USDA Agricultural Research News Service
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