Third Times a Charm

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Hello fellow MFPers,

This is my third time around trying MFP and I'm hoping this time it sticks. I'm going on my first cruise in May and going to grad school in the fall and want to leave with a healthier me. It's hard doing this on my own because my family and friends aren't dedicated to losing weight and eating healthy. I'm hoping to find better motivation here among people going through the same thing. My family history puts me at a high risk for a lot of health issues and I want to start a healthy lifestyle young before it's too late. How does everyone stick to MFP or getting in shape if no one around you is? HELP :)