When following the high-protein, low-GI (glycaemic index) diet, you alter the types of food you eat in order to increase the gut hormone signal to your brain and trigger the ‘stop eating’ signal.

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Once confined to sportsmen and women, high-protein diets are now commonplace – with Paleo, Atkins, Zone and Dukan advocating that people eat large quantities of fish, meat, eggs, nuts and cheese ...

Dairy sections are packed with hard-to-pronounce fare such as skyr and kefir. High-protein diets have become mainstream. On social media, food and fitness influencers recommend protein.