Once the preserve of bulky bodybuilders, protein shakes are becoming more popular among low-key exercisers.
Increasing numbers of people, particularly women, are scooping protein powder into their smoothies or water bottles, even adding it to meals in a bid to stay fit and healthy.
Sales are booming — the sports nutrition market was worth £650 million last year, a rise of 23 per cent on the previous year — and you can now find these products filling up shelves in supermarkets and chemists.
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