Offal's on the menu for breakfast, lunch and dinner, along with cold plunges and exercise in this second phase of Sir Roy Strong's historic slimming experiment.
As the volunteers groan with hunger, Sir Roy decides it's time to test their powers of self restraint. There are gasps of horror as one of the volunteers gives in to temptation.
The calorie trader arrives to demonstrate how the cost of a bar of chocolate can be offset by a five mile run.
But the results of the weigh-in prove Sir Roy's point, when it comes to losing weight and keeping in shape, nothing beats discipline.
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