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Knowing how healthy or unhealthy certain foods are should be fairly straightforward but the way packaged food is labelled is a battleground between health campaigners and food manufacturers.

Two years ago the government did a deal with manufacturers to put colour coded warnings on the front of packs. That voluntary agreement comes into force in full this Christmas.

But with inconsistent labelling across brands, has it made any difference or are we still as confused as ever?

In the latest in his series on sugar, Jim Reed investigates.