A two-year randomized controlled trial published in the British Journal of Nutrition found no significant difference in weight loss between people drinking diet beverages and those drinking water during a structured weight management programme. The SWITCH study included 493 adults with overweight or obesity, although only 220 completed the full trial. Among those who completed it, participants drinking diet beverages lost an average of 4.8 kg, compared with 3.7 kg in the water group. Both groups maintained some weight loss, but the difference was not statistically significant. The findings suggest that diet drinks may be an alternative to water during weight management, although neither showed a clear advantage over the other.
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