In Norway, a significant proportion of the adult population is currently classified as overweight (\~50%) or obese (\~23%). Over the past four decades, there has been a significant rise in the prevalence of overweight and obesity in both children and adults. Obesity is associated with a higher risk of chronic diseases such as cardiovascular diseases, type 2 diabetes, respiratory disease, osteoarthritis and specific cancers. Consequently, leading to increased morbidity and reduction in life expectancy. A healthy lifestyle including meeting recommendations for diet and physical activity is considered beneficial the prevention of chronic diseases, and for quality of life. There is limited evidence on weight reduction programs implemented outside specialized healthcare services, however intensive lifestyle modifications have demonstrated promising effects on sustainable weight loss. The Kickstart Program is a lifestyle program addressing weight reduction, changes in body composition and improved health-related quality of life (HRQoL) by integrating personalized dietary guidance and physical activity (PA) over a three, four or six-month period for registered participants, and can be considered an organized follow-up intervention. The participants receive close monitoring and support from clinical dietitians, physiotherapists and personal trainers. Unlike patients in specialized healthcare, Kickstart participants sign up and pay for it themselves, without any support from referrals or financial aid. This financial commitment is thought to make participants more motivated and facilitate compliance with the program. Recognizing the potential of programs like Kickstart to reduce healthcare costs by preventing lifestyle diseases, especially outside of specialized healthcare, shows why it is important to study how well they work. The study's findings can be leveraged to assess the influence of lifestyle programs and enhance the support available to adults with obesity. The study will tighten the knowledge gap concerning how an intervention of intensive dietary changes and PA specifically effects weight loss, FFM and HRQoL within a three-month timeframe. The overall aim of the study is to investigate the effect of a combined diet and PA intervention for people with a BMI\>25 kg/m² on body weight, body composition, RMR and HRQoL.
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Bioelectircal impedance (BIA)
Timeframe: Base line to three months, and one year follow up
Dual-Energy X-Ray Absorptiometry (DEXA).
Timeframe: Base line to three months, and one year follow up
Resting energy expenditure (REE)
Timeframe: Base line to three months, and one year follow up
Questionnaire RAND 36-Item Short Form Health Survey (RAND-36)
Timeframe: Base line to three months, and one year follow up
Assessment of diet with Digikost questionnaire
Timeframe: Base line to three months, and one year follow up