Blackcurrants Boosts Glucose Metabolism

Wednesday, December 9th, 2020 | 784 Views

Blackcurrants have a beneficial effect on the blood glucose response after a meal. They balance the glucose response of ingested sugar by attenuating its rise and delaying its fall. The effect is likely associated with berry-derived polyphenolic compounds, anthocyanins, which are rich in blackcurrants.

The beneficial health effect of blackcurrants was supported by a recent study conducted at the University of Eastern Finland. In the clinical meal study (Maqua) the beneficial effect on postprandial glucose response was achieved by 75 g (1.5 dL) of blackcurrants, a remarkably smaller portion size than in earlier studies. Blackcurrant had attenuated postprandial glycaemic response, which was seen in reduced maximum glucose and insulin, delayed fall of glucose, and delayed rise of free fatty acids because of hypoglycaemia.

Blackcurrants are often consumed with added sugar because of their natural sourness, which may be a cause of concern for health-conscious consumers. However, it seems that sugar consumed with blackcurrants is not as unhealthy as sugar consumed without berries. Over a longer period of time, smaller variations in the blood glucose and insulin levels, and improved insulin sensitivity, may decrease the risk of type 2 diabetes.

Berries are an important component of a healthy diet, being rich in vitamins, minerals, dietary fibre and polyphenols. So far, however, the EU has not authorised health claims for berries. In recent years, there have been many studies monitoring the effects of berries on glucose metabolism, with the dark berries, such as blackcurrant and bilberry, having the most convincing results. Black-coloured berries, rich in anthocyanins, seem to attenuate the blood glucose response to added sugar, compared to a control product having the same amount of sugar. The same effect is demonstrated by anthocyanins extracted from blackcurrants. Polyphenolic compounds may slow down the absorption of glucose from the small intestine by interacting with carbohydrate-digesting enzymes and glucose transport proteins. In addition, polyphenolic compounds may reduce oxidative stress and inflammation.

Blackcurrants are an interesting raw material for the food industry because of their high content of anthocyanins and easy availability. They have the potential for being developed into new healthy and tasty products.


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