Glycemic and Insulinemic Responses to Commonly Consumed Potatoes in Bangladeshi Type 2 Diabetic Subjects.

Glycemic indices (GIs) and insulin responses are useful for measuring biological effects and consequences of carbohydrates when designing healthy diets, particularly for people with or at risk of developing diabetes and others disorders such as metabolic syndrome. In this study, we investigated GIs and insulin (as measured by C-peptide) responses of patients with type 2 diabetes mellitus (T2DM) to Bangladeshi potatoes and sweet potatoes. Using a cross-over design, ten T2DM subjects consumed equivalent carbohydrate amounts (50 g of total carbohydrate) of either the vegetables or white bread (WB) (as reference food). Serum glucose levels were determined after 0, 15, 30, 45, 60, 90, 120, 150 and 180 minutes, and C-peptide levels were determined at 0 and 180 minutes. Glycemic Indices and Glycemic Loads (GLs) were calculated. Both plain and sweet potatoes showed a significantly higher serum glucose response compared to the reference food. The similar glycemic response between plain and sweet potatoes was reflected in their GI values: 162  50 and 191  66, respectively. The GL values were 8 and 11, respectively. The substantially higher glycemic response and GI values of the two potatoes were not the consequence of a suppressed insulin response. Compared to the mean values of the international table, Bangladeshi potatoes and sweet potatoes are very high GI foods. However, based on the dietary practices in our society, potatoes and sweet potatoes may be used as low and medium GL foods, respectively. This work may help create a better food exchange table for diabetic patients.

Índice glicémico, índice insulinémico y carga glicémica de bebidas de soya con un contenido bajo y alto en hidratos de carbono / Glycemic, insulinemic index, glycemic load of soy beverage with low and high content of carbohydrates

Consumption of soy has increased in Western countries due to the benefits on health and the attitude of the people to consume natural products as alternative to the use of pharmacological therapies. However, there is no evidence whether the consumption of 25 g of soy protein as recommended by the Food and Drug Administration has some effect on glucose absorption and consequently on insulin secretion. The aim of the present study was to determine glycemic index (GI), insulinemic index (InIn), and glycemic load (GL) of several soy beverages containing low or high concentration of carbohydrates, and compare them with other foods such as peanuts, whole milk, soluble fiber and a mixed meal on GI and InIn. The results showed that soy beverages had low or moderate GI, depending of the presence of other compounds like carbohydrates and fiber. Consumption of soy beverages with low concentration of carbohydrates produced the lowest insulin secretion. Therefore, these products can be recommended in obese and diabetic patients. Finally soy beverages should contain low maltodextrins concentration and be added of soluble fiber.

El consumo de soya se ha incrementado en países occidentales debido a sus beneficios sobre la salud y por la toma de conciencia de la gente a consumir productos naturales como alternativa a los medicamentos. Sin embargo, no se conoce totalmente si el consumo de 25 g de proteína de soya como recomienda la Administración de Alimentos y Medicamentos de Estados Unidos (FDA) tiene algún efecto sobre la absorción de glucosa y su respuesta sobre la secreción de insulina. Por lo que el objetivo del presente trabajo fue determinar el índice glicémico (IG), índice insulinémico (InIn) y la carga glicémica (CG) de diferentes bebidas de soya con un bajo y alto contenido de hidratos de carbono y compararlos con otros alimentos como cacahuates, la leche entera, la fibra soluble y una comida para ver el efecto de los hidratos de carbono, la fibra y la grasa sobre los IG e InIn. Los resultados muestran que las bebidas de soya presentan un IG bajo a moderado dependiendo de la presencia de otros componentes como son los hidratos de carbono y la fibra. La secreción de insulina fue significativamente menor en las bebidas de soya con bajo contenido de hidratos de carbono, por lo que pueden ser recomendadas en pacientes obesos con resistencia a la insulina o en pacientes diabéticos. Se recomienda que estas bebidas tengan bajo contenido en maltodextrinas y de preferencia con la adición de fibra soluble.

Effect of Resistant Starch on Human Glycemic Response / 대한지역사회영양학회지

In order to observe the effects of resistant starches on human glycemic response, nine female university students were investigated using cellulose (CED), resistant starch 3 (RS3D) and resistant starch 4 (RS4D) diets. Each woman's blood sugar and insulin, triacylglycerol and free fatty in plasma concentration were measured at fasting state, then 15, 30, 45, 60, 75, 90 and 120 minute after each test diet feeding. Glycemic indices of the Cellulose diet (CED: 57.9 +/- 3.00), the Resistant starch 3 diet (RS3D: 52.6 +/- 7.9) and the Resistant starch 4 diet (RS4D: 52.9 +/- 10.2) were similar to each other, but they were significantly lower in comparison with those of white wheat bread diet (WWBD: 100). Insulinemic indices of the CED (49.8 +/- 8.2), RS3D (50.0 +/- 7.3) and RS4D (72.4 +/- 7.7) were significantly lower in comparison with the white wheat bread diet (WWBD: 100), but among the dietary fiber diets, the insulinemic index of RS4D was significantly higher than the CED and the RS3D. Plasma triacylglycerol contents of the CED, RS3D and RS4D including WWBD showed gradual increase in tendency after lowering in early stage of each test diet feeding, but not significantly different in each dietary fiber added diet. Plasma free fatty acid contents of the CED, RS3D and RS4D including WWBD showed gradual decrease in tendency after each test diet feeding, but not significantly different by each dietary fiber added diet. In above results, we speculate that resistant starch 3 controls rapid elevation of blood sugar by delaying intestinal digestion and absorption of cellulose, but the result appears to be different from RS4 in comparison. Thus, RS3 intakes may contribute to the diet therapy of diabetic humans, but more studies on RS4 is needed in the future.