GDA Guideline Daily Amount - the predicted daily consumption of an average consumer eating a diet conforming to government healthy eating recommendations. No obligation to display.
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This GDA was created to help "clarify" the quantities listed on food labels for the consumer.
If government eating recommendations are wrong, ie. the food pyramid, then the GDA will be extremely misleading. Apparently in the UK, the GDA for sugar is 25% of daily calories. Pretty scary.