Effects of acute intake of grape/pomegranate pomace dietary supplement on glucose metabolism and oxidative stress in adults with abdominal obesity

• Published in: International journal of food sciences and nutrition Vol. 71; no. 1; pp. 94 - 105
• Main Authors: Pérez-Ramírez, Iza F., de Diego, Elena Hernández, Riomoros-Arranz, Marta, Reynoso-Camacho, Rosalía, Saura-Calixto, Fulgencio, Pérez-Jiménez, Jara
• Format: Journal Article
• Language: English
• Published: England Taylor & Francis 02.01.2020; Taylor & Francis Ltd
• Subjects: abdominal obesity; antioxidant activity; Antioxidants; Dietary intake; Dietary supplements; excretion; Food science; Glucose; Glucose metabolism; Glucose tolerance; glucose tolerance tests; Grape; Grapes; Insulin; insulin resistance; metabolic syndrome; Metabolism; Obesity; Oxidative metabolism; Oxidative stress; Polyphenols; pomace; pomegranate; pomegranate pomace; Urine; metabolic syndrome; pomace; polyphenols; abdominal obesity; Grape; pomegranate
• ISSN: 0963-7486; 1465-3478; 1465-3478
• DOI: 10.1080/09637486.2019.1607831

A controlled acute, cross-over clinical study (NCT02710461) was performed in order to evaluate the effects on glucose metabolism of a grape/pomegranate pomace dietary supplement in subjects with abdominal obesity (aged 40-60, n = 20). A standard 75 g oral glucose tolerance test (OGTT) was administered alone, together with or 10 h after the consumption of 10 g of the dietary supplement, rich in both extractable (0.4 g) and non-extractable (1.4 g) polyphenols. The dietary supplement did not ameliorate glucose or insulin at any sampling time. No improvement in antioxidant capacity was observed in plasma or urine, concordant with no increased urine polyphenol excretion. A tendency towards improved insulin sensitivity was observed when the product was consumed 10 h before glucose solution. These results suggest that a single realistic dose of grape/pomegranate pomace is not able to clearly improve glucose metabolism; chronic intake remains to be evaluated.