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American Journal of Clinical Nutrition, Vol 28, 748-755, Copyright © 1975 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Effects of carbohydrate restriction on glucose tolerance of normal men and reactive hypoglycemic patients

JW Anderson and RH Herman

Normal individuals ingesting a low carbohydrate diet frequently develop an impairment of glucose tolerance as measured by the oral glucose tolerance test; most of these diets, however, have been high in fat content. Our present studies demonstrate that a low carbohydrate diet (57 g/day) did not impair the glucose tolerance of normal men if the fat content was similar to values on a standard (301 g/day) carbohydrate diet. However, a low carbohydrate diet did lead to impaired glucose tolerance when the fat content was 16 per cent higher than on the control diet. Thus our present and previous studies demonstrate that normal men maintain normal glucose tolerance on low carbohydrate diets and suggest that the deterioration of the glucose tolerance observed on high fat diets is related to the increased fat content rather than to the reduced carbohydrate content of these diets. Seven patients with reactive hypoglycemia were exquisitely sensitive to carbohydrate deprivation. Whereas the glucose tolerance tests of normal men were not altered by a low carbohydrate, high protein diet, a significant deterioration of glucose tolerance occurred when reactive hypoglycemic patients were changed from control diets to low carbohydrate, high protein diets. These hypoglycemic patients also showed an exaggerated deterioration of the glucose tolerance after a 48- hour fast when compared tothe response of normal men. Our observations suggest that a low carbohydrate, high protein diet is not the best therapeutic diet for certain patients with reactive hypoglycemia because this diet does not provide symptomatic improvement and, in addition, leads to impaired glucose tolerance.


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