Can I lose 70 pounds?

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Hello, I have been struggling to lose weight ever since the birth of my first child. It crept up slowly with each baby I carried an extra 10 - 20 lbs. Five kids later, here I am 70 lbs. over weight. I found this site and decided to committ myself to losing this weight once and for all. My 25th wedding anniversary is this July. My mini goal is to lose 20 lbs by my anniversary. We are celebrating with a cruise to the virgin islands in November and my second goal is to lose 40 more by then. If I stick to this plan, can I do it? I started yesterday and it seemed very easy. But what happens when life gets in the way...holidays, celebrations, get togethers, I see lots of road blocks up ahead. Has anyone lost a large amount of weight by using myfitnesspal? What was your secret to success?