Fitbitter starting over

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Hello! After I got engaged last year I went on a mission to lose 25 lbs quickly. I combined a fitbit with low carb and the hardest caloric restriction. I was in school so I had plenty of flexibility in my schedule to walk and exercise. In July I was down 20 lbs and felt amazing. Then I started a desk job with loads of free food in the office and my fiancé and I were in the process of buying a home. I gained all 20lbs back by December. This time around I'd like to be part of a community that's following a healthy lifestyle and continue the conversation with my fiancé about living healthier. I also want to lose the weight slower so I don't yo-yo again. Any advice for me? Thanks!