Finally Free--56 Year Old new to MFP looking for buddies

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Hi. I'm 56, single, and having the time of my life. My son just moved out and took the dog. So now I'm free. Woo Hoo! I recently lost 45 pounds via Optifast, but I'm having trouble keeping it off. I already gained 8 pounds back. My diet coach says that keeping track of food and activity is the most successful strategy. So here I go.