Effectiveness of an internet-based self-help intervention for improving mental health in individuals with obesity: study protocol for a randomised controlled trial.

2 3 Worldwide, the proportion of people with obesity has tripled since 1975, 4 and nearly one in four adults has obesity, 5 with an increasing trend. 1 In Germany, about one in five adults (19.0%) report a BMI ≥30. 6 Obesity is an important risk factor for adverse health outcomes, eg, type 2 diabetes mellitus, stroke, osteoarthritis, coronary heart disease and functional impairments. 1 7 8 Obesity can also affect mental health: evidence suggest

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