Can two glasses of wine really ruin your week? After Steven Bartlett was mocked by Greg James for joyless 'optimisation culture', experts reveal how even small amount of alcohol can affect the body - and whether fitness tracker gadgets are worth the price

The Dragons Den star, 33, said the data on his wearable smart technology Whoop showed that even a modest intake of alcohol negatively impacted his sleep and diet, as well as his dopamine and cortisol.

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