Our expert says:
The SA Food Tables do not list 'polenta', but seeing that it is basically cooked, thick, yellow maize meal, you can use the energy value cited for the latter of 151 kcal or 634 kJ per 100g. Kcal refers to kilocalories or calories. kJ is the metric measure, calories, the non-metric measure of energy. 1 kcal = 4,2 kJ.
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