The steaming plate of fish balls in tomato sauce looks and smells appetising enough, but I hesitate to tuck in, and not just because it's 10 in the morning. These processed balls are no ordinary food: they could represent the future of the weight loss industry. Think of diet food and what usually springs to mind is tiny portions of insubstantial fare. Not so for a range of foods designed to work by being more filling than usual - meaning that, in theory, you should eat less.
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